WO2023068497A1 - 메탄 개질용 촉매 및 이의 제조방법 - Google Patents
메탄 개질용 촉매 및 이의 제조방법 Download PDFInfo
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- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen
- C01B3/02—Production of hydrogen; Production of gaseous mixtures containing hydrogen
- C01B3/32—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air
- C01B3/34—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air by reaction of hydrocarbons with gasifying agents
- C01B3/38—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air by reaction of hydrocarbons with gasifying agents using catalysts
- C01B3/40—Production of hydrogen; Production of gaseous mixtures containing hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide or air by reaction of hydrocarbons with gasifying agents using catalysts characterised by the catalyst
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- C01B2203/0227—Processes for making hydrogen or synthesis gas containing a reforming step containing a catalytic reforming step
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- C01B2203/1205—Composition of the feed
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- C01B2203/1235—Hydrocarbons
- C01B2203/1241—Natural gas or methane
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Definitions
- This application relates to a catalyst for reforming methane and a method for preparing the same.
- Carbon dioxide reforming is a technology to obtain synthesis gas composed of hydrogen and carbon monoxide by reacting methane and carbon dioxide.
- Syngas is a material with high development value as a raw material for various downstream processes.
- the reforming reaction of natural gas is largely a steam reforming process such as the following reaction formulas 1 to 5, a carbon dioxide reforming process (CO 2 reforming), a catalyst It can be classified into catalytic partial oxidation, autothermal reforming, and tri-reforming.
- various catalysts may be used for reforming activity.
- a noble metal catalyst when used in the reforming process, there is an advantage in that carbon deposition is relatively low and the reaction efficiency is high compared to a nickel-based catalyst.
- nickel catalysts are mainly used in the reforming process.
- a catalyst in which nickel metal is supported on a support such as alumina is widely used as a commercial catalyst, but in this case, there is a problem in that the nickel catalyst is deactivated by carbon inevitably generated on the surface of the nickel catalyst.
- the present application is intended to provide a catalyst for reforming methane and a method for preparing the same.
- a perovskite-based catalyst component supported on the porous metal support and represented by Formula 1 below
- A is Y, La or Ba
- B is Ni, Co, Fe, Mn, Cr, Mo, Ru or Rh;
- x is a real number greater than or equal to 0 and less than 1,
- y is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- the value of the thermal expansion coefficient of the metal oxide catalyst provides a catalyst that is 84% to 100% of the value of the thermal expansion coefficient of the porous metal support.
- It provides a method for producing a catalyst for methane reforming comprising a.
- the thermal expansion coefficient of the metal oxide catalyst provides a method for preparing a catalyst that is 84% to 100% of the thermal expansion coefficient of the porous metal support.
- the catalyst for reforming methane may be formed in the form of perovskite nanoparticles by directly coating the perovskite-based catalyst component represented by Formula 1 on a porous metal support without a separate binder. Accordingly, there is a feature that the active surface area of the catalyst for methane reforming can be increased.
- the catalyst for methane reforming since the catalyst for methane reforming according to an exemplary embodiment of the present application directly supports a catalyst component on a porous metal support having high thermal conductivity, it can exhibit good activity even at high space velocity during the methane reforming reaction, and carbon deposition or sintering It is characterized by stable operation for a long time without any symptoms.
- the catalyst according to an exemplary embodiment of the present application has a characteristic that the thermal expansion coefficient of the metal oxide catalyst is 84% to 100% of the thermal expansion coefficient of the porous metal support at a temperature of 600 ° C. or higher, so that a separate The metal oxide catalyst can be directly supported on the porous metal support without additives. Therefore, it is possible to operate for a long time without reducing the activity of the catalyst even in high-temperature hydrocarbon reactions, and stable operation is possible without coke deposition or sintering of catalyst components even at high space velocity.
- Example 1 is a diagram showing an electron micrograph of the surface of a catalyst for reforming methane according to Example 1 of the present application.
- Example 2 is a view showing an electron micrograph of a cross section of a catalyst for reforming methane according to Example 1 of the present application.
- Example 3 is a diagram showing an electron micrograph of the surface of a catalyst according to Example 22 of the present application.
- FIG. 4 is a diagram showing an electron micrograph of the surface of a catalyst according to Comparative Example 12 of the present application.
- the pellet-type support catalyst it is currently widely used in industrial reformers. Due to the limitation of the mass transfer rate, the performance of the catalyst is lower than that of the powder catalyst in terms of catalyst performance, but there is an advantage that it can be used for a long time because a support is used.
- ⁇ -Al 2 O 3 pellets which are widely used as the pellet-type support catalyst, they have weak structural strength and can be easily broken, thereby generating a differential pressure in the reactor.
- the characteristics of the pellet-type support catalyst it is bulky, so when used in a high-capacity reformer, the volume is considerably increased.
- all reforming reactions are sensitive to the reaction temperature. In the case of conventional pellet-type catalysts, the thermal conductivity is very low, and heat is not evenly distributed throughout the reactor.
- a catalyst for reforming methane according to an exemplary embodiment of the present application includes a porous metal support; and a perovskite-based catalyst component supported on the porous metal support and represented by Formula 1 below.
- A is Y, La or Ba
- B is Ni, Co, Fe, Mn, Cr, Mo, Ru or Rh;
- x is a real number greater than or equal to 0 and less than 1,
- y is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- Formula 1 may be represented by Formula 2 below, but is not limited thereto.
- B is Ni, Co, Fe, Mn, Cr, Mo, Ru or Rh;
- y is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- Formula 1 may be represented by Formula 3 or 4 below, but is not limited thereto.
- x is a real number greater than 0 and less than 1;
- y is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- the porous metal support may be made of a material capable of maintaining thermal stability at a high temperature of 800° C. or higher.
- the porous metal support may be composed of at least one selected from NiFeCrAl, NiCrAl, stainless steel, and Inconel.
- the porous metal support is a support having various shapes, and has a small heat capacity and excellent heat transfer ability, so it can be molded into a desired shape and used.
- the shape, size, etc. of the porous metal support is not particularly limited, and the porosity of the porous metal support may be 10% to 99%, preferably 50% to 96%.
- the average pore size of the porous metal support may be 150 ⁇ m to 3,000 ⁇ m, 400 ⁇ m to 2,000 ⁇ m, and 600 ⁇ m to 1,700 ⁇ m.
- the porous metal support may be appropriately prepared by those skilled in the art using a method known in the art in consideration of the material, pore size, and porosity of the porous metal support described above. According to an exemplary embodiment of the present application, porous metal supports having various materials, pore sizes, and the like can be applied as in the examples described below.
- the content of the perovskite-based catalyst component may be 3% to 40% by weight, 6% to 35% by weight And, it may be 7% by weight to 30% by weight.
- the content of the perovskite-based catalyst component is less than 3% by weight based on the total weight of the methane reforming catalyst, reactivity may be reduced due to relatively few active sites on the catalyst surface, which is not preferable.
- the content of the catalyst component exceeds 40% by weight, it contains a relatively large amount of the catalyst component compared to the porous metal support, making it difficult to maintain the pore structure, and the coupling between the catalyst component and the porous metal support is difficult. It may not be easy, and thus the practical benefit of the methane reforming reaction may be reduced.
- the catalyst for reforming methane may be formed in the form of perovskite nanoparticles by directly coating the perovskite-based catalyst component represented by Formula 1 on a porous metal support without a separate binder. Accordingly, there is a feature that the active surface area of the catalyst for methane reforming can be increased.
- the catalyst for reforming methane is steam reforming, carbon dioxide reforming (CO 2 reforming), catalytic partial oxidation, autothermal reforming, It can be applied to a tri-reforming process or a mixed reforming process, and the methane reforming process is not particularly limited.
- a porous metal such as a metal foam having mechanical strength such as honeycomb or pellet carrier, low apparent density, no problem of weight increase, and excellent porosity and low pressure loss, so that it can be applied to high temperature catalysis.
- the support was applied as a catalyst carrier.
- a metal oxide catalyst having a coefficient of thermal expansion (CTE) similar to that of the porous metal support was supported.
- a catalyst according to an exemplary embodiment of the present application includes a porous metal support; and a metal oxide catalyst supported on the porous metal support, wherein at a temperature of 600° C. or higher, the metal oxide catalyst has a thermal expansion coefficient of 84% to 100% of that of the porous metal support.
- the porous metal support is as described above.
- the thermal expansion coefficient of the metal oxide catalyst is 84% to 100% of the thermal expansion coefficient of the porous metal support.
- the thermal expansion coefficient value of the metal oxide catalyst may be 86% to 100% of the thermal expansion coefficient value of the porous metal support.
- the thermal expansion coefficient value can be measured using a method known in the art. More specifically, the thermal expansion coefficient value can be measured using a thermal mechanical analyzer (TMA), a dilatometer, or the like.
- TMA thermal mechanical analyzer
- dilatometer a dilatometer
- a TMA or dalatometer is an instrument that measures the change in size and volume of a sample as a function of time, temperature, and force.
- the coefficient of thermal expansion of the metal oxide catalyst is 84% to 100% of the value of the coefficient of thermal expansion of the porous metal support.
- the metal oxide catalyst can be directly supported on the porous metal support without additional additives.
- the catalyst may include the porous metal support; and a metal oxide catalyst directly supported on the porous metal support, and may not include a separate additive.
- the metal oxide catalyst may be represented by Formula 5 below.
- A is at least one selected from Y, La, Ba and Sr;
- B is at least one selected from Ni, Co, Fe, Ti, Mn, Cr, Mo, Ru, and Rh;
- x is a real number greater than 0 and less than or equal to 1;
- y is a real number greater than 0 and less than or equal to 1,
- ⁇ is a real number greater than 0 and less than 1.
- Formula 5 may be represented by Formula 6 below, but is not limited thereto.
- A' is Y, La or Ba
- B is Ni, Co, Fe, Mn, Cr, Mo, Ru or Rh;
- x' is a real number greater than or equal to 0 and less than 1,
- y' is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- Formula 5 may be represented by Formula 7 below, but is not limited thereto.
- B is Ni, Co, Fe, Mn, Cr, Mo, Ru or Rh;
- y' is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- Formula 5 may be represented by Formula 8 or 9 below, but is not limited thereto.
- x' is a real number greater than or equal to 0 and less than 1,
- y' is a real number greater than 0 and less than 0.5;
- ⁇ is a real number greater than 0 and less than 1.
- the content of the metal oxide catalyst may be 3% to 40% by weight, 6% to 35% by weight, 7% to 7% by weight 30% by weight.
- the content of the metal oxide catalyst is less than 3% by weight based on the total weight of the catalyst, it is not preferable because reactivity may be reduced due to relatively few active sites on the catalyst surface.
- the content of the metal oxide catalyst exceeds 40% by weight, it contains a relatively large amount of catalyst components compared to the porous metal support, making it difficult to maintain the pore structure, and the combination of the catalyst component and the porous metal support This may not be easy, and thus the practical benefit of the hydrocarbon reaction may be reduced.
- the catalyst according to an exemplary embodiment of the present application may be applied to a hydrocarbon reforming reaction, cracking reaction, oxidation reaction, partial oxidation reaction, or hydrogenation reaction, but is not limited thereto.
- the catalyst according to an exemplary embodiment of the present application may be applied to a reforming reaction of methane, wherein the reforming reaction of methane is a steam reforming process, a carbon dioxide reforming process (CO 2 reforming), a catalytic partial oxidation process (catalytic reforming process) partial oxidation), autothermal reforming, tri-reforming or mixed reforming.
- the reforming reaction of methane is a steam reforming process, a carbon dioxide reforming process (CO 2 reforming), a catalytic partial oxidation process (catalytic reforming process) partial oxidation), autothermal reforming, tri-reforming or mixed reforming.
- a method for preparing a catalyst for reforming methane includes preparing a solution containing a precursor of a perovskite-based catalyst component represented by Chemical Formula 1; coating a solution containing a precursor of the perovskite-based catalyst component on a porous metal support; and drying and calcining.
- the porous metal support, perovskite-based catalyst components, and the like are the same as described above.
- a perovskite-based catalyst component may be directly coated on a porous metal support without a separate binder.
- a method for preparing a catalyst for reforming methane includes preparing a solution containing a precursor of a perovskite-based catalyst component represented by Chemical Formula 1.
- the precursor of the perovskite-based catalyst component is a precursor of a metal constituting the perovskite-based catalyst component represented by Formula 1, and the metal molar ratio of the perovskite-based catalyst component represented by Formula 1 is adjusted by adjusting the content thereof.
- the metal precursor is not particularly limited, and ammonium salts, nitrates, carbonates, chlorides, or mixtures thereof of the metal elements may be used in combination.
- the method for preparing a catalyst for reforming methane includes coating a solution containing a precursor of the perovskite-based catalyst component on a porous metal support.
- the coating method may use a method known in the art, for example, dip-coating, wash-coating, etc., but is not limited thereto.
- the method for preparing a catalyst for reforming methane includes coating a solution containing a precursor of the perovskite-based catalyst component on a porous metal support, followed by drying and calcining.
- the drying may be performed at a temperature of 50 ° C to 200 ° C for 1 hour to 48 hours, and may be performed at a temperature of 60 ° C to 150 ° C for 5 hours to 36 hours, but is not limited thereto.
- the firing may be performed for 1 hour to 10 hours at a temperature of 350 ° C to 1,100 ° C under an air atmosphere, and may be performed for 1.5 hours to 8 hours at a temperature of 500 ° C to 1,000 ° C under an air atmosphere. but not limited to
- a step of measuring the weight of the catalyst supported on the porous metal support may be further included after the step of drying and calcining.
- a solution containing the precursor of the perovskite-based catalyst component is coated on the porous metal support until the desired amount of catalyst is supported on the porous metal support. doing; And drying and firing may be repeated 1 to 20 times.
- the catalyst for methane reforming supports a catalyst component on a porous metal support having high thermal conductivity, it can exhibit good activity even at high space velocity during the methane reforming reaction, and can be used for a long time without carbon deposition or sintering. It is characterized by stable operation.
- the method for preparing a catalyst includes preparing a precursor solution of the metal oxide catalyst; coating a precursor solution of the metal oxide catalyst on a porous metal support; and drying and calcining to prepare a catalyst in which the metal oxide catalyst is supported on the porous metal support, wherein at a temperature of 600° C. or higher, the coefficient of thermal expansion of the metal oxide catalyst is greater than that of the coefficient of thermal expansion of the porous metal support. 84% to 100%.
- the step of coating the precursor solution of the metal oxide catalyst on the porous metal support may be performed by a sol-gel coating process.
- the precursor of the metal oxide catalyst is a precursor of a metal constituting the metal oxide catalyst, and the metal molar ratio of the metal oxide catalyst may be adjusted by adjusting the content thereof.
- the metal precursor is not particularly limited, and ammonium salts, nitrates, carbonates, chlorides, or mixtures thereof of the metal elements may be used in combination.
- a solution containing the precursor of the perovskite catalyst component was prepared through the citric acid method.
- Strontium nitrate (Sr(NO 3 ) 3 H 2 O) and nickel nitrate (Ni(NO 3 ) 2 ) were dissolved in distilled water together with citric acid and ethylene glycol.
- titanium isopropoxide (Ti(OCH(CH 3 ) 2 ) 4 ) in ethanol the two solutions were mixed at 70°C. Thereafter, after stirring for 3 hours, the mixture was cooled to room temperature and stored. At this time, the concentration of the solution was 0.1M, and nickel contained 3 mol% of titanium.
- FIG. 1 An electron micrograph of the surface of the catalyst for reforming methane according to Example 1 of the present application is shown in FIG. 1 below.
- FIG. 2 An electron micrograph of a cross section of the catalyst for reforming methane according to Example 1 of the present application is shown in FIG. 2 below.
- the catalyst loading amount can be calculated by Equation 1 below.
- Sr 0.92 Y 0.08 Ti 0.97 Ni 0.03 O 3- ⁇ was prepared in the same manner as in Example 1, except that yttrium nitrate (Y(NO 3 ) 2 ) was added in an amount of 8 mol% relative to strontium. (0 ⁇ ⁇ ⁇ 1) was prepared as a supported catalyst. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Y(NO 3 ) 2 yttrium nitrate
- Sr 0.92 Y 0.08 Ti 0.95 Ni 0.05 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) A supported catalyst was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.95 Ni 0.05 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti 0.90 Ni 0.10 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) A supported catalyst was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.90 Ni 0.10 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti 0.85 Ni 0.15 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) A supported catalyst was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.85 Ni 0.15 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) A supported catalyst was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.96 Y 0.04 Ti 0.80 Ni 0.20 O 3- ⁇ was prepared in the same manner as in Example 10, except that yttrium nitrate (Y(NO 3 ) 2 ) was added and used in an amount of 4 mol% relative to strontium. (0 ⁇ ⁇ ⁇ 1) was prepared as a supported catalyst. At this time, the supported amount of Sr 0.96 Y 0.04 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Y(NO 3 ) 2 yttrium nitrate
- Sr 0.88 Y 0.12 Ti 0.80 Ni 0.20 O 3- A catalyst loaded with ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.88 Y 0.12 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.84 Y 0.16 Ti 0.80 Ni 0.20 O 3- A catalyst loaded with ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.84 Y 0.16 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti 0.85 Ru 0.15 O 3- ⁇ ( 0 ⁇ ⁇ ⁇ 1) was prepared as a supported catalyst. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.85 Ru 0.15 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti 0.80 Ru 0.20 O 3- ⁇ ( 0 ⁇ ⁇ ⁇ 1) was prepared as a supported catalyst. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.80 Ru 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti was applied to the porous metal support in the same manner as in Example 10, except that NiCrAl_800 (average pore size: 800 ⁇ m) was used instead of NiCrAl (average pore size: 1,200 ⁇ m) as the porous metal support.
- a catalyst loaded with 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti was applied to the porous metal support in the same manner as in Example 10, except that NiCrAl_1500 (average pore size: 1,500 ⁇ m) was used instead of NiCrAl (average pore size: 1,200 ⁇ m) as the porous metal support.
- a catalyst loaded with 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti was applied to the porous metal support in the same manner as in Example 10, except that NiFeCrAl (average pore size: 1,200 ⁇ m) was used instead of NiCrAl (average pore size: 1,200 ⁇ m) as the porous metal support.
- a catalyst loaded with 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.80 Ni 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti was applied to the porous metal support in the same manner as in Example 16, except that NiFeCrAl (average pore size: 1,200 ⁇ m) was used instead of NiCrAl (average pore size: 1,200 ⁇ m) as the porous metal support.
- a catalyst loaded with 0.80 Ru 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.80 Ru 0.20 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Sr 0.92 Y 0.08 Ti 0.97 Ni 0.03 O 3 - ⁇ ( 0 ⁇ ⁇ ⁇ 1) was prepared as a supported catalyst. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- Strontium nitrate (Sr(NO 3 ) 3 H 2 O) and nickel nitrate (Ni(NO 3 ) 2 ) were dissolved in distilled water together with citric acid and ethylene glycol. After dissolving titanium isopropoxide (Ti(OCH(CH 3 ) 2 ) 4 ) in ethanol, the two solutions were mixed at 70°C. After stirring for 30 minutes, the temperature was raised to 100°C and stirred for 3 hours. At this time, the concentration of the solution was 0.1M, and nickel contained 3 mol% of titanium. Thereafter, the temperature was raised to 150° C. and dried for 24 hours. The dried body was subjected to heat treatment at 350 ° C. in an air atmosphere for 3 hours, and then grinding was performed. Thereafter, heat treatment was performed again at 900° C. in an air atmosphere for 3 hours. Finally, a powder form of SrTi 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) catalyst was prepared.
- a porous metal support (NiCrAl, average pore size: 1,200 ⁇ m) alone was used as Comparative Example 5.
- a porous metal support (NiFeCrAl, average pore size: 1,200 ⁇ m) alone was used as Comparative Example 6.
- a first solution was prepared using the Al 2 O 3 dispersion solution so that the Al 2 O 3 content was 15% by weight.
- a solution containing the precursor of the perovskite catalyst component was prepared in the same manner as in Example 1, and was named a second solution.
- Dip coating was performed so that the first solution could be supported on a porous metal support (NiCrAl, average pore size: 1,200 ⁇ m), followed by drying at 150 ° C for 24 hours and heat treatment at 900 ° C for 3 hours in an air atmosphere. proceeded. Thereafter, dip coating was performed so that the second solution could be supported on the porous metal support on which the Al 2 O 3 of the first solution was supported, and then dried at 150 ° C. for 24 hours, and 3 at 900 ° C. in an air atmosphere. Heat treatment was performed for a period of time. This process was repeated several times to finally prepare a catalyst in which Al 2 O 3 and SrTi 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) were supported on a porous metal support. At this time, the supported amount of SrTi 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 10% by weight based on the total weight of the catalyst.
- a porous metal support NiCrAl, average pore size: 1,
- a fixed bed reaction system was introduced to carry out the dry reforming reaction of methane.
- a reduction process was performed at 800° C. for 2 hours under 10% H 2 /N 2 conditions, followed by a catalytic reaction for 100 hours.
- the reaction conversion rate was calculated after 100 hours of reaction by analyzing the composition of the generated gas using gas chromatography (GC), and is shown in Table 1 below.
- the porous metal support according to the present invention and the catalyst for methane reforming composed of the perovskite-based catalyst component represented by Formula 1 are conventional Al 2 O 3 applied as a support Catalysts (Comparative Examples 1-2), catalysts using perovskite-based catalyst components alone (Comparative Examples 3-4), and catalysts using a porous metal support alone (Comparative Examples 5-6), CH 4 conversion rate and CO It can be seen that all 2 conversion rates are excellent. This can be seen as the effect of maximizing the active surface by utilizing a porous metal support and minimizing carbon deposition by supporting a perovskite-based catalyst component.
- a catalyst (Comparative Example 7) in which a catalyst using conventional Al 2 O 3 as a support is additionally supported on a porous metal support and a perovskite-based catalyst component is supported on a porous metal support using an organic binder such as methyl cellulose. Even in the case of the Shikin catalyst (Comparative Example 8), it can be confirmed that the CH 4 conversion rate and the CO 2 conversion rate are significantly lower than those of the methane reforming catalyst according to the present invention.
- the catalyst for methane reforming according to an exemplary embodiment of the present application is formed in the form of perovskite nanoparticles by directly coating the perovskite-based catalyst component represented by Formula 1 on a porous metal support without a separate binder It can be. Accordingly, there is a feature that the active surface area of the catalyst for methane reforming can be increased.
- the catalyst for methane reforming since the catalyst for methane reforming according to an exemplary embodiment of the present application supports a catalyst component on a porous metal support having high thermal conductivity, it can exhibit good activity even at high space velocity during the methane reforming reaction, and carbon deposition or sintering phenomena It is characterized by stable operation for a long time without
- the precursor solution of the metal oxide catalyst was prepared through the citric acid method (Pechini method). Strontium nitrate (Sr(NO 3 ) 3 H 2 O) and nickel nitrate (Ni(NO 3 ) 2 ) were dissolved in distilled water with citric acid. After dissolving titanium isopropoxide (Ti(OCH(CH 3 ) 2 ) 4 ) in ethylene glycol, the two solutions were mixed at 70°C to 90°C. Thereafter, after obtaining a transparent solution, it was cooled to room temperature and stored. At this time, the concentration of the solution was 0.1M, and nickel contained 3 mol% of titanium.
- Coating was performed so that the precursor solution of the metal oxide catalyst prepared above could be supported on a porous metal support (NiCrAl, cell size: 1,200 ⁇ m), and then dried at 70 ° C for 24 hours, and then dried at 900 ° C for 3 hours in an air atmosphere. Heat treatment was carried out during This process was repeated several times to finally prepare a catalyst in which SrTi 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was supported on a porous metal support. At this time, the supported amount of SrTi 0.97 Ni 0.03 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 15% by weight based on the total weight of the catalyst.
- the catalyst loading amount can be calculated by Equation 1 below.
- Sr was added to the porous metal support in the same manner as in Example 21, except that yttrium nitrate (Y(NO 3 ) 2 ) was added in an amount of 8 mol% relative to strontium and the nickel content was increased to 15 mol% relative to titanium.
- a catalyst supported with 0.92 Y 0.08 Ti 0.85 Ni 0.15 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was prepared. At this time, the supported amount of Sr 0.92 Y 0.08 Ti 0.85 Ni 0.15 O 3- ⁇ (0 ⁇ ⁇ ⁇ 1) was 15% by weight based on the total weight of the catalyst.
- the precursor solution of the metal oxide catalyst was prepared through citric acid method.
- Strontium nitrate (Sr(NO 3 ) 3 H 2 O) was dissolved in distilled water together with citric acid and ethylene glycol.
- titanium isopropoxide (Ti(OCH(CH 3 ) 2 ) 4 ) in ethanol the two solutions were mixed at 70°C. Thereafter, after stirring for 3 hours, the mixture was cooled to room temperature and stored. At this time, the concentration of the solution was 0.1M.
- Coating was performed so that the precursor solution of the metal oxide catalyst prepared above could be supported on a porous metal support (NiCrAl, cell size: 1,200 ⁇ m), and then dried at 70 ° C for 24 hours, and then dried at 900 ° C for 3 hours in an air atmosphere. Heat treatment was carried out during This process was repeated several times to finally prepare a catalyst in which SrTiO 3 was supported on a porous metal support. At this time, the supported amount of SrTiO 3 based on the total weight of the catalyst was 15% by weight.
- NiO 2 was supported on the Al 2 O 3 support using an incipient wetness method. At this time, the supported amount of NiO 2 based on the total weight of the catalyst was 15% by weight.
- a porous metal support (NiCrAl, cell size: 1,200 ⁇ m) alone was used as Comparative Example 13.
- the thermal expansion coefficient value was measured using TMA equipment (TA Instrument, Q400) under measurement conditions of a load of 0.1 N and N 2 flow of 100 ml/min.
- a fixed bed reaction system was introduced to carry out the dry reforming reaction of methane.
- a reduction process was performed at 800° C. for 2 hours under 10% H 2 /N 2 conditions, followed by a catalytic reaction for 100 hours.
- GHSV Gas Hour Space Velocity, based on CH 4
- the product gas composition was analyzed using gas chromatography (GC) to calculate the reaction conversion rate after 24 hours of reaction, and is shown in Table 3 below.
- GC gas chromatography
- the catalyst according to an exemplary embodiment of the present application has excellent methane conversion rate and CO 2 conversion rate during the methane reforming reaction.
- the catalyst according to an exemplary embodiment of the present application has a characteristic that the thermal expansion coefficient of the metal oxide catalyst is 84% to 100% of the thermal expansion coefficient of the porous metal support at a temperature of 600 ° C or higher, so that without a separate additive A metal oxide catalyst may be directly supported on a porous metal support.
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Abstract
Description
Claims (14)
- 다공성 금속 지지체; 및상기 다공성 금속 지지체에 담지되고, 하기 화학식 1로 표시되는 페로브스카이트계 촉매 성분으로 이루어진 메탄 개질용 촉매:[화학식 1]Sr1-xAxTi1-yByO3-δ상기 화학식 1에서,A는 Y, La 또는 Ba 이며,B는 Ni, Co, Fe, Mn, Cr, Mo, Ru 또는 Rh 이고,x는 0 이상 1 미만의 실수이며,y는 0 초과 0.5 미만의 실수이고,δ는 0 초과 1 미만의 실수이다.
- 청구항 1에 있어서, 상기 화학식 1은 하기 화학식 2로 표시되는 것인 메탄 개질용 촉매:[화학식 2]SrTi1-yByO3-δ상기 화학식 2에서,B는 Ni, Co, Fe, Mn, Cr, Mo, Ru 또는 Rh 이고,y는 0 초과 0.5 미만의 실수이고,δ는 0 초과 1 미만의 실수이다.
- 청구항 1에 있어서, 상기 화학식 1은 하기 화학식 3 또는 4로 표시되는 것인 메탄 개질용 촉매:[화학식 3]SrTi1-yNiyO3-δ[화학식 4]Sr1-xYxTi1-yNiyO3-δ상기 화학식 3 및 4에서,x는 0 초과 1 미만의 실수이며,y는 0 초과 0.5 미만의 실수이고,δ는 0 초과 1 미만의 실수이다.
- 청구항 1에 있어서, 상기 다공성 금속 지지체는 NiFeCrAl, NiCrAl, 스테인레스 스틸(stainless steel) 및 인코넬(inconel) 중에서 선택되는 1종 이상으로 구성되는 것인 메탄 개질용 촉매.
- 청구항 1에 있어서, 상기 메탄 개질용 촉매의 총중량을 기준으로, 상기 페로브스카이트계 촉매 성분의 함량은 3 중량% 내지 40 중량%인 것인 메탄 개질용 촉매.
- 청구항 1에 있어서, 상기 메탄 개질용 촉매는 수증기 개질공정(steam reforming), 이산화탄소 개질공정(CO2 reforming), 촉매 부분 산화 공정(catalytic partial oxidation), 자열개질공정(autothermal reforming), 삼중개질공정(tri-reforming) 또는 혼합개질공정(mixed reforming)에 적용되는 것인 메탄 개질용 촉매.
- 다공성 금속 지지체; 및상기 다공성 금속 지지체에 담지된 금속 산화물 촉매를 포함하고,600℃ 이상의 온도에서, 상기 금속 산화물 촉매의 열팽창계수 값은 상기 다공성 금속 지지체의 열팽창계수 값의 84% 내지 100%인 것인 촉매.
- 청구항 7에 있어서, 상기 금속 산화물 촉매는 하기 화학식 5로 표시되는 것인 촉매:[화학식 5]AxByO3-δ상기 화학식 5에서,A는 Y, La, Ba 및 Sr 중에서 선택되는 1종 이상이고,B는 Ni, Co, Fe, Ti, Mn, Cr, Mo, Ru 및 Rh 중에서 선택되는 1종 이상이며,x는 0 초과 1 이하의 실수이고,y는 0 초과 1 이하의 실수이며,δ는 0 초과 1 미만의 실수이다.
- 하기 화학식 1로 표시되는 페로브스카이트계 촉매 성분의 전구체를 포함하는 용액을 준비하는 단계;다공성 금속 지지체에 상기 페로브스카이트계 촉매 성분의 전구체를 포함하는 용액을 코팅하는 단계; 및건조 및 소성하는 단계를 포함하는 메탄 개질용 촉매의 제조방법:[화학식 1]Sr1-xAxTi1-yByO3-δ상기 화학식 1에서,A는 Y, La 또는 Ba 이며,B는 Ni, Co, Fe, Mn, Cr, Mo, Ru 또는 Rh 이고,x는 0 이상 1 미만의 실수이며,y는 0 초과 0.5 미만의 실수이고,δ는 0 초과 1 미만의 실수이다.
- 청구항 9에 있어서, 상기 화학식 1은 하기 화학식 2로 표시되는 것인 메탄 개질용 촉매의 제조방법:[화학식 2]SrTi1-yByO3-δ상기 화학식 2에서,B는 Ni, Co, Fe, Mn, Cr, Mo, Ru 또는 Rh 이고,y는 0 초과 0.5 미만의 실수이고,δ는 0 초과 1 미만의 실수이다.
- 청구항 9에 있어서, 상기 화학식 1은 하기 화학식 3 또는 4로 표시되는 것인 메탄 개질용 촉매의 제조방법:[화학식 3]SrTi1-yNiyO3-δ[화학식 4]Sr1-xYxTi1-yNiyO3-δ상기 화학식 3 및 4에서,x는 0 초과 1 미만의 실수이며,y는 0 초과 0.5 미만의 실수이고,δ는 0 초과 1 미만의 실수이다.
- 청구항 9에 있어서, 상기 다공성 금속 지지체는 NiFeCrAl, NiCrAl, 스테인레스 스틸(stainless steel) 및 인코넬(inconel) 중에서 선택되는 1종 이상으로 구성되는 것인 메탄 개질용 촉매의 제조방법.
- 금속 산화물 촉매의 전구체 용액을 준비하는 단계;다공성 금속 지지체에 상기 금속 산화물 촉매의 전구체 용액을 코팅하는 단계; 및건조 및 소성하여, 상기 다공성 금속 지지체에 금속 산화물 촉매가 담지된 촉매를 제조하는 단계를 포함하고,600℃ 이상의 온도에서, 상기 금속 산화물 촉매의 열팽창계수 값은 상기 다공성 금속 지지체의 열팽창계수 값의 84% 내지 100%인 것인 촉매의 제조방법.
- 청구항 13에 있어서, 상기 금속 산화물 촉매는 하기 화학식 5로 표시되는 것인 촉매의 제조방법:[화학식 5]AxByO3-δ상기 화학식 5에서,A는 Y, La, Ba 및 Sr 중에서 선택되는 1종 이상이고,B는 Ni, Co, Fe, Ti, Mn, Cr, Mo, Ru 및 Rh 중에서 선택되는 1종 이상이며,x는 0 초과 1 이하의 실수이고,y는 0 초과 1 이하의 실수이며,δ는 0 초과 1 미만의 실수이다.
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| US18/271,961 US12569831B2 (en) | 2021-10-21 | 2022-07-27 | Methane-reforming catalyst and method for producing same |
| CN202280008124.7A CN116635145A (zh) | 2021-10-21 | 2022-07-27 | 用于甲烷重整的催化剂及生产其的方法 |
| JP2023539046A JP7779559B2 (ja) | 2021-10-21 | 2022-07-27 | メタン改質用触媒及びその製造方法 |
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| EP4257236A4 (en) * | 2021-11-18 | 2024-07-10 | Lg Chem, Ltd. | CATALYST FOR METHANE REFORMING AND PREPARATION METHOD THEREFOR |
| WO2025035181A1 (en) * | 2023-08-16 | 2025-02-20 | Monash University | Catalyst-coated reactor |
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| KR20250109899A (ko) * | 2024-01-11 | 2025-07-18 | 주식회사 엘지화학 | 메탄 개질용 촉매 및 이의 제조방법 |
| CN121100019A (zh) * | 2024-04-08 | 2025-12-09 | 株式会社Lg化学 | 用于甲烷重整的催化剂及其制备方法 |
| CN119447335A (zh) * | 2024-11-11 | 2025-02-14 | 南京工业大学 | 一种直接甲烷固体氧化物燃料电池阳极催化层材料及其制备方法和应用 |
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| WO2025035181A1 (en) * | 2023-08-16 | 2025-02-20 | Monash University | Catalyst-coated reactor |
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| US20240116032A1 (en) | 2024-04-11 |
| JP2025143320A (ja) | 2025-10-01 |
| JP2024500507A (ja) | 2024-01-09 |
| EP4245409A4 (en) | 2024-07-10 |
| KR20230057253A (ko) | 2023-04-28 |
| EP4245409A1 (en) | 2023-09-20 |
| KR20230057254A (ko) | 2023-04-28 |
| US12569831B2 (en) | 2026-03-10 |
| CN116635145A (zh) | 2023-08-22 |
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