WO2023066338A1 - 一种scm-38分子筛及其制备方法和用途 - Google Patents
一种scm-38分子筛及其制备方法和用途 Download PDFInfo
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- C07C41/09—Preparation of ethers by dehydration of compounds containing hydroxy groups
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- C01P2004/22—Particle morphology extending in two dimensions, e.g. plate-like with a polygonal circumferential shape
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Definitions
- the invention belongs to the field of molecular sieves, and in particular relates to a novel molecular sieve, that is, SCM-38 molecular sieve, a preparation method thereof, and an application thereof.
- Molecular sieves are a class of porous crystalline materials widely used in chemical industries such as oil refining and catalysis. Molecular sieves with different pore structures reflect different macroscopic properties such as adsorption and catalysis. In addition, molecular sieves with different structures have also been synthesized. There are more than 250 types of molecular sieves with known structures (including partially disordered ones). Since molecular sieves have uniform and regular pores, and the pore size is of the same order as that of small organic molecules, molecules entering the interior of molecular sieves can be "sieved" according to their spatial dimensions during chemical reactions, thereby obtaining a certain degree of selective adsorption. and catalytic shape-selective effects.
- the framework of molecular sieves is usually formed by the connection of coordination tetrahedrons (TO 4 ) through common vertices (generally oxygen atoms).
- TO 4 coordination tetrahedrons
- common vertices generally oxygen atoms.
- the tetrahedrons in the framework are mainly silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons, and these two tetrahedrons can also be replaced by other tetrahedrons to form various framework structures or various frameworks.
- tetrahedrons in the framework are mainly silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons, and these two tetrahedrons can also be replaced by other tetrahedrons to form various framework structures or various frameworks.
- composed of molecular sieves composed of molecular sieves.
- Flanigen et al. (Molecular Sieve Zeolites-I, ACS, Washington DC) reported the synthesis of phosphorus-aluminum molecular sieves. It can be understood that the silicon-oxygen tetrahedron in the zeolite molecular sieve is replaced by the phosphorus-oxygen tetrahedron to form a molecular sieve.
- the framework of this type of molecular sieve is formed by connecting AlO 4 - and PO 4 + common oxygen atoms, and the entire molecular sieve framework exhibits electrical neutrality.
- aluminum-oxygen tetrahedrons or phosphorus-oxygen tetrahedrons in phosphorus-aluminum molecular sieves can also be replaced by other tetrahedrons, the most common of which are silicon-oxygen tetrahedrons and zinc-oxygen tetrahedrons. Due to the introduction of these tetrahedrons , which endows phosphorus-aluminum molecular sieves with new characteristics. Compared with zeolite molecular sieves, the artificial synthesis of aluminum phosphorus molecular sieves is relatively late.
- the oxides of aluminum, silicon and phosphorus are mixed, and then obtained with analcime (analcime), chabazite (chabazite), phillipsite-harmotome (phillipsite-harmotome), L molecular sieve,
- analcime analcime
- chabazite chabazite
- phillipsite-harmotome phillipsite-harmotome
- L molecular sieve L molecular sieve
- a Type B molecular sieves and B type molecular sieves have the same crystal structure of silicon phosphorus aluminum molecular sieves, wherein the phosphorus content is 5% to 25% (calculated as P 2 O 5 ), but no molecular sieves with structures different from known zeolite molecular sieves have been found.
- 4310440 in 1982 used organic amines or quaternary ammonium compounds as templates to hydrothermally synthesize a series of aluminum phosphorus molecular sieves, including: AlPO 4 -5, AlPO 4 -8, AlPO 4 -9, AlPO 4 -11, AlPO 4 -12, AlPO 4 -14 , AlPO 4 -16, AlPO 4 -17, AlPO 4 -18, AlPO 4 -20, AlPO 4 -21, AlPO 4 -22, AlPO 4 -23, AlPO 4 -25, AlPO 4 -26, AlPO 4 -28, AlPO 4 -31, etc.
- molecular sieves with new structures are constantly being synthesized.
- the type of organic template is one of the key factors to determine its structure. So far, organic amines are still the most widely used templates in the synthesis of aluminum-phosphate molecular sieves.
- silica-alumina zeolite molecular sieves the industrial application of aluminum-phosphorus molecular sieves is still rare. At present, only a few molecular sieves have obtained practical industrial applications, such as SAPO-34 and SAPO-11 molecular sieves.
- the technical problem to be solved by the present invention is to provide a new type of molecular sieve (phosphorus aluminum molecular sieve or silicon phosphorus aluminum molecular sieve) not involved in the prior art, namely SCM-38 molecular sieve and its preparation method and use.
- a new type of molecular sieve phosphorus aluminum molecular sieve or silicon phosphorus aluminum molecular sieve
- the first aspect of the present invention provides a kind of SCM-38 molecular sieve, wherein, described molecular sieve is phosphorus aluminum or silicon phosphorus aluminum molecular sieve, and described SCM-38 molecular sieve shows following diffraction peak characteristic in XRD spectrogram: X-ray diffraction peaks appear at diffraction angles of 7.20 ⁇ 0.1, 10.81 ⁇ 0.1, 11.60 ⁇ 0.1, 14.32 ⁇ 0.1, 21.39 ⁇ 0.1, 21.83 ⁇ 0.1, 27.31 ⁇ 0.1, 28.72 ⁇ 0.1, among which the peak at 2 ⁇ is 7.20 ⁇ 0.1 strong peak,
- the second aspect of the present invention provides a kind of preparation method of above-mentioned SCM-38 molecular sieve, it comprises the following steps:
- step b) liquid crystallization of the synthetic mother obtained in step a) to obtain SCM-38 molecular sieves
- the quaternary ammonium compound 1 is a compound represented by the following formula (I),
- R 1 , R 2 , R 3 and R 4 are each independently selected from C1-C6 straight chain or branched chain alkyl (preferably C1-C4 straight chain or branched chain alkyl, more preferably C1-C3 straight chain or branched chain alkyl),
- X - represents a counter ion (preferably a halide anion, nitrate, hydroxide),
- the quaternary ammonium compound 2 is a compound represented by the following formula (II),
- R 5 , R 6 , R 7 and R 8 are each independently selected from C1-C6 straight chain or branched chain alkyl (preferably C1-C4 straight chain or branched chain alkyl, more preferably C1-C3 straight chain or branched chain alkyl), R represents hydrogen or hydroxyl, X- represents a counter ion (preferably halide anion, nitrate, hydroxide), m represents an integer of 1-4 (preferably an integer of 1-3, more preferably 1 -2 integer), n represents an integer of 5-10 (preferably an integer of 5-8, more preferably an integer of 5-6),
- the counter ion X ⁇ of at least one represents hydroxide.
- the third aspect of the present invention provides a molecular sieve composition, which comprises the above-mentioned SCM-38 molecular sieve of the present invention and a binder.
- the fourth aspect of the present invention provides a methanol-to-dimethyl ether catalyst, which comprises the above-mentioned SCM-38 molecular sieve of the present invention or the above-mentioned molecular sieve composition of the present invention.
- the fifth aspect of the present invention provides a method for producing dimethyl ether from methanol, which includes the step of converting methanol into dimethyl ether in the presence of a catalyst, the catalyst comprising the above-mentioned SCM-38 molecular sieve of the present invention or the above-mentioned molecular sieve of the present invention combination.
- the invention provides a novel phosphor-aluminum molecular sieve or silicon-phosphorus-aluminum molecular sieve.
- the phosphorus-aluminum molecular sieve or the silicon-phosphoraluminum molecular sieve of the present invention is used as a catalyst for converting methanol into dimethyl ether, and exhibits excellent activity.
- the preparation method of the molecular sieve of the present invention can conveniently and efficiently prepare the molecular sieve of the present invention.
- Fig. 1 is the XRD spectrum of embodiment 1 gained aluminophosphate precursor A
- Fig. 2 is the XRD spectrum of embodiment 2 gained aluminophosphate precursor B;
- Fig. 3 is the XRD collection of illustrative plates of embodiment 3 gained SCM-38 molecular sieves
- Fig. 4 is the SEM figure of embodiment 3 gained SCM-38 molecular sieves
- Fig. 5 is the XRD collection of illustrative plates of embodiment 10 gained SCM-38 molecular sieves
- Fig. 6 is the SEM figure of embodiment 10 gained SCM-38 molecular sieves
- Fig. 7 is the XRD collection of illustrative plates of embodiment 13 gained SCM-38 molecular sieves
- Fig. 8 is the SEM figure of embodiment 13 gained SCM-38 molecular sieves
- Fig. 9 is the XRD spectrum of the product obtained in Comparative Example 1.
- Fig. 10 is the XRD pattern of products obtained in comparative example 2.
- Fig. 11 is the XRD spectrum of the product obtained in Comparative Example 3.
- Figure 12 is the XRD spectrum of the product obtained in Comparative Example 4.
- the chemical composition of molecular sieves is based on the molar ratio of the corresponding element in the oxide form of the highest valence state that can exist stably, that is, P2O5 for phosphorus (P), P2O5 for Silicon (Si) is counted as SiO 2 , aluminum (Al) is counted as Al 2 O 3 , titanium (Ti) is counted as TiO 2 , boron (B) is counted as B 2 O 3 , and zirconium (Zr) is counted as ZrO 2 In terms of SnO 2 for tin (Sn) and Fe 2 O 3 for iron (F e ).
- C1-C6 straight chain or branched chain alkyl methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, sec-butyl, Pentyl and its isomers, hexyl and its isomers.
- the C1-C6 straight chain or branched chain alkyl is preferably a C1-C4 straight chain or branched chain alkyl, more preferably a C1-C3 straight chain or branched chain alkyl.
- the first aspect of the present invention provides a kind of SCM-38 molecular sieve, wherein, described molecular sieve is phosphorus aluminum molecular sieve or silicon phosphorus aluminum molecular sieve, and described SCM-38 molecular sieve shows following diffraction peak characteristic in XRD spectrogram: X-ray diffraction peaks appear at diffraction angles of 7.20 ⁇ 0.1, 10.81 ⁇ 0.1, 11.60 ⁇ 0.1, 14.32 ⁇ 0.1, 21.39 ⁇ 0.1, 21.83 ⁇ 0.1, 27.31 ⁇ 0.1, 28.72 ⁇ 0.1, among which the peak at 2 ⁇ is 7.20 ⁇ 0.1 strong peak.
- the molecular sieve of the present invention may further contain template agent (quaternary ammonium compound 1, quaternary ammonium compound 2 of the present invention), water, fluorine source fluorine components, etc., such as those filled in its pores.
- template agent quaternary ammonium compound 1, quaternary ammonium compound 2 of the present invention
- water quaternary ammonium compound 2 of the present invention
- fluorine source fluorine components etc., such as those filled in its pores.
- the present invention thinks that it is not necessary to specify the amount of the moisture, the templating agent, and the fluorine component, because the properties of the phosphorus-aluminum molecular sieve or the silicon-phosphorus-aluminum molecular sieve of the present invention are mainly determined by the ratio between silicon, phosphorus, and aluminum, and these elements Exist in the form of oxides, therefore, the composition of molecular sieves described in the present invention is only represented by its oxides. .
- the molecular sieves of the invention have a triangular morphology.
- the XRD spectrum of the molecular sieve of the present invention has X-ray diffraction peaks as shown in the following table:
- the second aspect of the present invention provides a kind of preparation method of SCM-38 molecular sieve, it comprises the following steps:
- step b) liquid crystallization of the synthetic mother obtained in step a) to obtain SCM-38 molecular sieves
- the quaternary ammonium compound 1 is a compound represented by the following formula (I),
- R 1 , R 2 , R 3 and R 4 are each independently selected from C1-C6 straight chain or branched chain alkyl, X - represents a counter ion,
- the quaternary ammonium compound 2 is a compound represented by the following formula (II),
- R 5 , R 6 , R 7 and R 8 are each independently selected from C1-C6 straight chain or branched chain alkyl, R represents hydrogen or hydroxyl, X - represents a counter ion, m represents an integer of 1-4, n Integer representing 5-10,
- X - represents a hydroxide group.
- R 1 , R 2 , R 3 and R 4 are each independently selected from C1-C4 straight chain or branched chain alkyl, more preferably each independently selected from C1-C3 straight chain or branched chain branched chain alkyl.
- R 1 , R 2 , R 3 and R 4 include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, sec-butyl, pentyl, and Isomers, hexyl and its isomers.
- R 5 , R 6 , R 7 and R 8 are each independently selected from C1-C4 straight chain or branched chain alkyl, more preferably each independently selected from C1-C3 straight chain or branched chain branched chain alkyl.
- R 5 , R 6 , R 7 and R 8 include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, tert-butyl, sec-butyl, pentyl, and Isomers, hexyl and its isomers.
- m is preferably an integer of 1-3, more preferably an integer of 1-2.
- n is preferably an integer of 5-8, more preferably an integer of 5-6.
- the counter ion (X ⁇ ) in the compound represented by the above formula (I) and the compound represented by formula (II) can be a conventional negative ion compatible with quaternary ammonium ions, including but not limited to Halogen (fluorine, chlorine, bromine, iodine) anions, nitrate, hydroxide, etc.
- the counter ion (X ⁇ ) of at least one of the compound represented by the above-mentioned formula (I) and the compound represented by the formula (II) represents hydroxide. That is, at least one of the compound represented by formula (I) and the compound represented by formula (II) is a quaternary ammonium hydroxide salt.
- the quaternary ammonium compound 1 of the present invention is preferably one or more of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide and the like.
- the quaternary ammonium cation in the quaternary ammonium compound 2 of the present invention is preferably 6-N, N-dimethylaminohexyl-2-hydroxyethyl dimethyl ammonium ion or 6-N , N-dimethylaminohexyl-ethyl dimethyl ammonium ion, its chemical structural formula is represented as follows:
- the molar ratio of each material is as follows: the silicon source is calculated as SiO 2 , the aluminum source is calculated as Al 2 O 3 , the aluminophosphate precursor In terms of Al 2 O 3 , P 2 O 5 , fluorine source in terms of HF and water in terms of H 2 O, it is (0-0.5) SiO 2 : (0.8-5) Al 2 O 3 : 1P 2 O 5 : ( 0.01-0.9) quaternary ammonium compound 1: (0.9-5) quaternary ammonium compound 2: (0.1-5) HF: (10-500) H 2 O, preferably (0-0.3) SiO 2 : (0.85-2) Al 2 O 3 : 1P 2 O 5 : (0.003-0.85) quaternary ammonium compound 1: (0.95-3) quaternary ammonium compound 2: (0.3-3) HF: (20-300) H 2 O, more preferably ( 0-0.1) SiO 2 , the aluminum source is calculated as Al 2 O 3 , the alumin
- the amount of aluminum source is determined according to the amount of Al2O3 in the aluminophosphate precursor, that is, when the amount of Al2O3 provided by the aluminophosphate precursor meets the above-mentioned ratio requirements, no Add aluminum source, when the amount of Al 2 O 3 provided by the aluminophosphate precursor cannot meet the above ratio requirements, add aluminum source to meet the above ratio requirements.
- the aluminum source is selected from pseudoboehmite, aluminum isopropoxide, aluminum sol, alumina, aluminum chloride, aluminum sulfate, hydrated alumina, sodium metaaluminate or hydroxide One or more of aluminum, etc.
- the silicon source is selected from one or more of silica sol, fumed silica, ethyl orthosilicate, silicic acid, or silica gel.
- the fluorine source is selected from one or more of hydrofluoric acid and ammonium fluoride.
- step a) the order of adding each material is not particularly limited, preferably: first mix water, optional aluminum source, optional silicon source and aluminophosphate precursor evenly , and then sequentially add quaternary ammonium compound 2, quaternary ammonium compound 1 and mix evenly, then add fluorine source. At this time, stirring may also be optionally performed as needed.
- the crystallization conditions are as follows: the crystallization temperature of the first stage is 120°C-150°C, and the crystallization time is 24-84 hours.
- the crystallization temperature 120°C-140°C the crystallization time is 48-80 hours;
- the second stage crystallization temperature is 170°C-200°C, the crystallization time is 2-24 hours, preferably, the crystallization temperature is 180°C-200°C ,
- the crystallization time is 4-18 hours.
- the SCM-38 molecular sieve product can be separated from the obtained mixture by any conventionally known separation means, such as centrifugation, washing and drying.
- the separation, washing and drying can be carried out in any manner conventionally known in the art, such as centrifugation or filtration, suction filtration.
- the drying temperature may be 40-120°C, preferably 50-80°C; the drying time may be 8-48 hours, preferably 12-24 hours. This drying can be carried out under normal pressure, also can carry out under reduced pressure, in order to save energy, often choose to carry out under normal pressure.
- the aluminophosphate precursor has a schematic chemical composition represented by the formula "Al 2 O 3 :xP 2 O 5 ", wherein 0.7 ⁇ x ⁇ 2.5, preferably 0.8 ⁇ x ⁇ 2.
- the XRD spectrum of the aluminophosphate precursor has X-ray diffraction peaks as shown in the following table:
- the XRD spectrum of the aluminophosphate precursor further has X-ray diffraction peaks as shown in the following table:
- the XRD spectrum of the aluminophosphate precursor further has X-ray diffraction peaks as shown in the following table:
- the preparation method of described aluminophosphate precursor comprises the following steps:
- the step of crystallizing the mother liquor mixture to obtain an aluminophosphate precursor is the step of crystallizing the mother liquor mixture to obtain an aluminophosphate precursor.
- the organic template agent RA is one or more selected from quaternary ammonium salts or quaternary ammonium bases; RB is One or more selected from imidazole or pyrrolidine derivatives.
- the solvent S 1 is one or more selected from amide-based solvents; the solvent S 2 is selected from cyclic One or more of such organic solvents; the S3 is one or more of water or C1-C6 alkanol.
- the organic template RA is selected from tetraethylammonium bromide, tetraethylammonium hydroxide, tetrapropyl bromide One or more of ammonium chloride, tetrapropylammonium hydroxide, tetrabutylammonium bromide, tetrabutylammonium hydroxide;
- the organic template R B is selected from imidazole, 2-methylimidazole, 4-methylimidazole Imidazole, 1-(3-aminopropyl)imidazole, 2-ethyl-4-methylimidazole, pyrrolidine, 1-(3-pyrrolidine)pyrrolidine, N-ethyl-2-aminomethylpyrrole One or more of alkanes.
- the solvent S is selected from N,N-dimethylformamide, N,N-dimethylacetamide, One or more of N,N-diethylformamide and N,N-dibutylformamide;
- the solvent S2 is selected from 1,4-dioxane, cyclohexane, cyclohexanone and One or more of them;
- the solvent S3 is one or more selected from methanol, ethanol, ethylene glycol, butanol, cyclohexanol and water.
- the organic template RA is preferably tetraethylammonium bromide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide One or more in ammonium and tetrabutylammonium hydroxide;
- organic templating agent R B is preferably 1-(3-aminopropyl) imidazole, 2-ethyl-4-methylimidazole, N-ethyl- One or more of 2-aminomethylpyrrolidines.
- the solvent S1 is preferably one of N,N-dimethylacetamide and N,N-dibutylformamide or several; the solvent S2 is preferably one or both of 1,4-dioxane and cyclohexanone; the solvent S3 is preferably one or both of ethanol and water, wherein Deionized water is preferred.
- the aluminum source in the preparation step of the mother liquor mixture, is calculated as Al 2 O 3 , the phosphorus source is calculated as P 2 O 5 , the organic
- the molar ratio of the organic template RA to the organic template RB is 0.01-1:1, preferably 0.1-0.5 : 1.
- the molar ratio of the solvent S 1 , the solvent S 2 , and the solvent S 3 is 1:0.01-1:1-100, Preferably it is 1:0.05-0.6:10-80.
- the aluminum source is selected from aluminum isopropoxide, aluminate, metaaluminate, aluminum salt, aluminum hydroxide , one or more of aluminum oxides and aluminum-containing minerals, preferably one or both of aluminate and metaaluminate.
- the phosphorus source is at least one selected from phosphoric acid, ammonium monohydrogen phosphate and ammonium dihydrogen phosphate, preferably orthophosphoric acid.
- stirring and sedimentation treatment are performed before crystallization treatment.
- the stirring time is 0.5-5 hours, and the precipitation treatment time is 1-12 hours.
- the mixing order of each raw material is not particularly limited, preferably, the aluminum source, the phosphorus source , the organic template is dispersed in one or a mixture of solvents S1 , S2 and S3 (for example in solvent S3 ), then stirred and precipitated, and then added S1 , S Other solvents not added among 2 and S 3 (eg mixture of solvents S 1 , S 2 ).
- the stirring time is 0.5-5 hours, and the precipitation treatment time is 1-12 hours.
- the mother liquor mixture in the preparation method of the aluminophosphate precursor, after the mother liquor mixture is prepared and before the crystallization treatment, the mother liquor mixture can be heat-treated, and the heat treatment temperature can be 40-100°C. Preferably 50-90°C; heat treatment can be 2-14 hours, preferably 4-12 hours. At this time, stirring may also be optionally performed as needed.
- the conditions of the crystallization treatment include: the crystallization temperature is 120-200°C, preferably 140-180°C, more preferably 140-160°C; crystallization time is 1-5 days, preferably 3-5 days, more preferably 4-5 days.
- conventional post-treatments are performed after the crystallization treatment, such as the steps of filtering, washing and drying to obtain the molecular sieve.
- the filtering, washing and drying can be carried out in any manner conventionally known in the art, wherein the separation is such as centrifugation or filtration, suction filtration.
- the drying temperature may be 40-120°C, preferably 50-80°C; the drying time may be 8-48 hours, preferably 12-24 hours. This drying can be carried out under normal pressure, also can carry out under reduced pressure, in order to save energy, often choose to carry out under normal pressure.
- the aluminophosphate precursor of the present invention is SCM-34 molecular sieve.
- the aluminophosphate precursor of the present invention can be prepared according to the preparation method disclosed in WO2022052967A1.
- the third aspect of the present invention provides a molecular sieve composition, including the SCM-38 molecular sieve prepared according to any of the aforementioned aspects or the SCM-38 molecular sieve prepared according to the preparation method of any of the aforementioned aspects, and a binder.
- the binder is not particularly limited, and can be a conventional binder in the art, for example, nano-silica, alumina, diatomaceous earth, hollow ceramic balls, etc. one or a mixture of them.
- the fourth aspect of the present invention provides a catalyst for methanol to dimethyl ether, which comprises the above-mentioned SCM-38 molecular sieve of the present invention, or the SCM-38 molecular sieve prepared according to the preparation method described in any of the preceding aspects, or the present invention The molecular sieve composition described above.
- a fifth aspect of the present invention provides a method for producing dimethyl ether from methanol, which includes the step of converting methanol into dimethyl ether in the presence of a catalyst, the catalyst comprising the above-mentioned SCM-38 molecular sieve of the present invention, or according to any of the foregoing
- the SCM-38 molecular sieve prepared by the preparation method described in the aspect, or the above-mentioned molecular sieve composition of the present invention.
- the special morphology SCM-38 molecular sieve of the present invention is a new type of molecular sieve, which has a unique XRD diffraction pattern and special morphology, which enriches the types of molecular sieves and the appearance of molecular sieves.
- the reagents and raw materials used are all commercially available products, and the purity is analytically pure.
- XRD X-ray diffraction pattern
- XRD X'Pert PRO type X-ray powder of Holland PANalytical company
- the composition of SiO 2 , Al 2 O 3 and P 2 O 5 in the molecular sieve is measured by ICP method.
- the ratio of elements in the samples was analyzed by Varian Analytical 725-ES inductively coupled plasma emission spectrometer from Varian Corporation of the United States.
- the product was filtered, washed, and dried at 80°C for 24 hours to obtain an aluminophosphate precursor, which was designated as A and set aside.
- the XRD pattern of aluminophosphate precursor A is shown in Figure 1, which has the X-ray diffraction peaks shown in Table 1 below:
- the XRD pattern of aluminophosphate precursor B is shown in Figure 2, which has the X-ray diffraction peaks shown in Table 2 below:
- the SEM of the gained SCM-38 molecular sieve is shown in Fig. 4, and its shape is a triangular shape, and its XRD spectrum is shown in Fig. 3, which has the main X-ray diffraction peaks shown in Table 3 below:
- the SEM picture of the molecular sieve is similar to that in Figure 4, showing a triangular shape.
- the XRD spectrum of the gained SCM-38 molecular sieve has the main X-ray diffraction peaks shown in Table 4 below:
- the SEM image of the molecular sieve is shown in Fig. 6, showing a triangular shape.
- the XRD spectrum of the obtained SCM-38 molecular sieve is shown in Figure 5, which has the main X-ray diffraction peaks shown in Table 10 below:
- the SEM picture of the molecular sieve is shown in Fig. 8, showing a triangular shape.
- the XRD spectrum of the obtained SCM-38 molecular sieve is shown in Figure 7, which has the main X-ray diffraction peaks shown in Table 13 below:
- the SEM of the SCM-38 molecular sieve is similar to that shown in Figure 4, and its shape is a triangular shape.
- the obtained XRD pattern has the main X-ray diffraction peaks shown in Table 14 below:
- Embodiment 15 catalytic activity evaluation
- Catalyst 2 was prepared in the same manner as the preparation of Catalyst 1 above except that the SCM-38 molecular sieve prepared in Example 10 was used.
- Catalyst 3 was prepared in the same manner as the preparation of Catalyst 1 above, except that the product prepared in Comparative Example 1 was used.
- catalyst 2 the same as the catalytic activity evaluation of catalyst 1, the activity of catalyst 2 was evaluated, and the result showed that the peak selectivity of dimethyl ether was 95.93%.
- Catalyst 3 was used to evaluate the catalytic activity of catalyst 2 in the same way as that of catalyst 1. The results showed that the peak selectivity of dimethyl ether was 63.42%.
- the invention provides a novel phosphorus-aluminum type molecular sieve or silicon-phosphorus-aluminum type molecular sieve.
- the phosphorus-aluminum type molecular sieve or silicon-phosphorus-aluminum type molecular sieve of the invention shows excellent activity as a catalyst for converting methanol into dimethyl ether.
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Abstract
Description
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.20±0.1 | 100 |
| 10.81±0.1 | 5-50 |
| 11.60±0.1 | 5-50 |
| 14.32±0.1 | 5-50 |
| 21.39±0.1 | 5-50 |
| 21.83±0.1 | 5-50 |
| 27.31±0.1 | 5-50 |
| 28.72±0.1 | 5-50 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.59±0.2 | 100 |
| 10.81±0.1 | 5-50 |
| 16.52±0.1 | 5-50 |
| 17.97±0.1 | 5-50 |
| 23.34±0.05 | 5-50 |
| 34.74±0.05 | 5-50 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 14.25±0.1 | 5-50 |
| 21.01±0.1 | 10-20 |
| 24.27±0.05 | 5-50 |
| 26.05±0.05 | 5-50 |
| 27.82±0.05 | 5-50 |
| 28.15±0.02 | 5-50 |
| 30.03±0.02 | 5-50 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 12.09±0.1 | 5-50 |
| 19.77±0.1 | 5-50 |
| 31.33±0.01 | 5-50 |
| 38.29±0.01 | 5-50 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.41 | 100 |
| 10.71 | 25 |
| 12.00 | 6 |
| 14.21 | 5 |
| 16.45 | 32 |
| 17.94 | 36 |
| 19.73 | 9 |
| 21.00 | 10 |
| 23.33 | 22 |
| 24.27 | 18 |
| 26.03 | 18 |
| 27.80 | 11 |
| 28.15 | 13 |
| 30.01 | 10 |
| 31.34 | 5 |
| 34.71 | 7 |
| 38.28 | 6 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.49 | 100 |
| 10.77 | 35 |
| 12.01 | 5 |
| 14.18 | 15 |
| 16.43 | 38 |
| 17.87 | 40 |
| 19.70 | 8 |
| 20.96 | 12 |
| 23.32 | 30 |
| 24.22 | 26 |
| 26.03 | 23 |
| 27.80 | 17 |
| 28.15 | 20 |
| 30.01 | 18 |
| 31.32 | 8 |
| 34.74 | 8 |
| 38.28 | 5 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.19 | 100 |
| 10.82 | 17 |
| 11.60 | 9 |
| 14.32 | 15 |
| 21.39 | 15 |
| 21.80 | 17 |
| 27.30 | 12 |
| 28.72 | 13 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.20 | 100 |
| 10.83 | 18 |
| 11.63 | 7 |
| 14.33 | 18 |
| 21.37 | 13 |
| 21.83 | 24 |
| 27.31 | 10 |
| 28.69 | 26 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.21 | 100 |
| 10.83 | 18 |
| 11.63 | 8 |
| 14.31 | 21 |
| 21.40 | 15 |
| 21.84 | 25 |
| 27.32 | 13 |
| 28.73 | 27 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.19 | 100 |
| 10.79 | 16 |
| 11.59 | 8 |
| 14.30 | 20 |
| 21.30 | 12 |
| 21.81 | 22 |
| 27.29 | 9 |
| 28.69 | 23 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.20 | 100 |
| 10.82 | 22 |
| 11.60 | 11 |
| 14.33 | 22 |
| 21.38 | 18 |
| 21.82 | 23 |
| 27.27 | 8 |
| 28.70 | 21 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.23 | 100 |
| 10.82 | 23 |
| 11.63 | 13 |
| 14.34 | 24 |
| 21.39 | 16 |
| 21.81 | 25 |
| 27.33 | 12 |
| 28.71 | 27 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.20 | 100 |
| 10.79 | 19 |
| 11.61 | 11 |
| 14.31 | 24 |
| 21.38 | 15 |
| 21.82 | 26 |
| 27.32 | 12 |
| 28.70 | 28 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.23 | 100 |
| 10.82 | 25 |
| 11.63 | 15 |
| 14.35 | 18 |
| 21.41 | 21 |
| 21.85 | 17 |
| 27.33 | 15 |
| 28.75 | 15 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.22 | 100 |
| 10.81 | 19 |
| 11.63 | 10 |
| 14.35 | 24 |
| 21.38 | 17 |
| 21.86 | 28 |
| 27.34 | 13 |
| 28.74 | 28 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.20 | 100 |
| 10.81 | 16 |
| 11.62 | 7 |
| 14.30 | 20 |
| 21.36 | 13 |
| 21.81 | 24 |
| 27.30 | 11 |
| 28.69 | 26 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.19 | 100 |
| 10.82 | 29 |
| 11.61 | 17 |
| 14.32 | 21 |
| 21.38 | 24 |
| 21.82 | 17 |
| 27.33 | 17 |
| 28.67 | 19 |
| 2θ(°) | 相对强度,[(I/I 0)×100] |
| 7.19 | 100 |
| 10.81 | 17 |
| 11.58 | 8 |
| 14.30 | 21 |
| 21.38 | 13 |
| 21.81 | 23 |
| 27.30 | 10 |
| 28.71 | 26 |
Claims (15)
- SCM-38分子筛,其中,所述分子筛为磷铝或硅磷铝分子筛,所述SCM-38分子筛在XRD谱图中显示出如下的衍射峰特征:在2θ衍射角7.20±0.1,10.81±0.1,11.60±0.1,14.32±0.1,21.39±0.1,21.83±0.1,27.31±0.1,28.72±0.1处出现X射线衍射峰,其中在2θ为7.20±0.1处为最强峰,所述SCM-38分子筛具有“P 2O 5·Al 2O 3·SiO 2”所代表的示意性化学组成,其中,以摩尔比计:Al 2O 3∶P 2O 5=0.8-1.5∶1,优选0.8-1.4,更优选0.9-1.3;SiO 2∶P 2O 5=0-0.1∶1,优选为0-0.09∶1,更优选为0-0.07∶1。
- 根据权利要求1所述的SCM-38分子筛,其特征在于,所述SCM-38分子筛的XRD图谱具有如下表所示的X射线衍射峰:
2θ(°) 相对强度,[(I/I 0)×100] 7.20±0.1 100 10.81±0.1 5-50 11.60±0.1 5-50 14.32±0.1 5-50 21.39±0.1 5-50 21.83±0.1 5-50 27.31±0.1 5-50 28.72±0.1 5-50 - 根据权利要求1所述的SCM-38分子筛,其特征在于,所述SCM-38分子筛具有三角形形貌。
- 根据权利要求1-3任一所述的SCM-38分子筛的制备方法,包括:a)将磷铝酸盐前驱体、季铵化合物1、季铵化合物2、氟源和水以及任选的铝源、任选的硅源混合,得到合成母液;b)将步骤a)所得合成母液晶化,制得SCM-38分子筛,其中,所述季铵化合物1为下式(I)所示的化合物,其中,R 1、R 2、R 3和R 4各自独立地选自C1-C6直链或支链烷基,X-表示抗衡离子,所述季铵化合物2为下式(II)所示的化合物,其中,R 5、R 6、R 7和R 8各自独立地选自C1-C6直链或支链烷基,R表示氢或羟基,X -表示抗衡离子,m表示1-4的整数,n表示5-10的整数;式(I)所示的化合物和式(II)所示的化合物中,至少一者的抗衡离子X -表示氢氧根,所述磷铝酸盐前驱体具有如式“Al 2O 3∶xP 2O 5”所代表的示意性化学组成,其中,0.7≤x≤2.5,优选0.8≤x≤2。
- 根据权利要求4所述的SCM-38分子筛的制备方法,其中,所述的磷铝酸盐前驱体的XRD图谱具有如下表所示的X射线衍射峰:
。2θ(°) 相对强度,[(I/I 0)×100] 7.59±0.2 100 10.81±0.1 5-50 16.52±0.1 5-50 17.97±0.1 5-50 23.34±0.05 5-50 34.74±0.05 5-50 - 按照权利要求5所述的制备方法,其特征在于,所述磷铝酸盐前驱体的XRD图谱还具有如下表所示的X射线衍射峰:
2θ(°) 相对强度,[(I/I 0)×100] 14.25±0.1 5-50 ,21.01±0.1 10-20 24.27±0.05 5-50 26.05±0.05 5-50 27.82±0.05 5-50 28.15±0.02 5-50 30.03±0.02 5-50 优选进一步具有如下表所示的X射线衍射峰: 。2θ(°) 相对强度,[(I/I 0)×100] 12.09±0.1 5-50 19.77±0.1 5-50 31.33±0.01 5-50 38.29±0.01 5-50 - 根据权利要求4-6中任一项所述的制备方法,其特征在于,所述的合成母液中,各物料的摩尔配比如下:硅源以SiO 2计、铝源以Al 2O 3计、磷铝酸盐前驱体以Al 2O 3、P 2O 5计、氟源以HF计和水以H 2O计,为(0-0.5)SiO 2∶(0.8-5)Al 2O 3∶1P 2O 5∶(0.01-0.9)季铵化合物1∶(0.9-5)季铵化合物2∶(0.1-5)HF∶(10-500)H 2O,优选为(0-0.3)SiO 2∶(0.85-2)Al 2O 3∶1P 2O 5∶(0.003-0.85)季铵化合物1∶(0.95-3)季铵化合物2∶(0.3-3)HF∶(20-300)H 2O,更优选为(0-0.1)SiO 2∶(0.0.86-1.5)Al 2O 3∶1P 2O 5∶(0.05-0.8)季铵化合物1∶(1-2)季铵化合物2∶(0.5-1.8)HF∶(50-130)H 2O。
- 根据权利要求4-7中任一项所述的制备方法,其特征在于,所述季铵化合物1为四甲基氢氧化铵、四乙基氢氧化铵、四丙基氢氧化铵等中的一种或几种;所述季铵化合物2中的季铵阳离子为6-N,N-二甲胺基己基-2-羟乙基二甲基铵根离子或6-N,N-二甲胺基己基-乙基二甲基铵根离子。
- 根据权利要求4-8中任一项所述的制备方法,其特征在于,所述铝源为选自拟薄水铝石、异丙醇铝、铝溶胶、氧化铝、氯化铝、硫酸铝、水合氧化铝、偏铝酸钠或者氢氧化铝中的一种或几种;所述硅源为选自硅溶胶、气相二氧化硅、正硅酸乙酯、硅酸或者硅胶中一种或几种;所述氟源为选自氢氟酸或氟化铵中一种或几种。
- 按照权利要求4-9任一所述的制备方法,其特征在于,步骤b)中,所述晶化的条件如下:第一段晶化温度为120℃-150℃,晶化时间为24-84小时,优选地,晶化温度为120℃-140℃,晶化时间为48-80小时;第二段晶化温度为170℃-200℃,晶化时间为2-24小时,优选地,晶化温度为180℃-200℃,晶化时间为4-18小时。
- 按照权利要求4-10任一所述的制备方法,其特征在于,在步骤b)之后,进一步包括分离步骤,优选的是所述分离步骤包括离心分离、洗涤和干燥中的至少一种处理。
- 分子筛组合物,包含权利要求1-3任一所述的分子筛或者按照权利要求4-11任一所述制备方法制备的分子筛以及粘结剂。
- 根据权利要求12所述的分子筛组合物,其中,所述粘结剂为选自纳米二氧化硅、氧化铝、硅藻土、空心陶瓷球中的一种或几种。
- 甲醇制二甲醚用催化剂,其包含权利要求1-3任一所述的分子筛或者、或者按照权利要求4-11任一所述制备方法制备的分子筛、或者权利要求12或13所述的分子筛组合物。
- 甲醇制二甲醚的方法,其中包括在催化剂的存在下使甲醇转化为二甲醚的步骤,所述催化剂包含权利要求1-3任一所述的分子筛或者、或者按照权利要求4-11任一所述制备方法制备的分子筛、或者权利要求12或13所述的分子筛组合物。
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| KR1020247016631A KR20240093797A (ko) | 2021-10-20 | 2022-10-20 | Scm-38 분자체, 및 이의 제조 방법 및 이의 용도 |
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| Publication number | Publication date |
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| EP4421039A1 (en) | 2024-08-28 |
| US20240409422A1 (en) | 2024-12-12 |
| EP4421039A4 (en) | 2025-10-29 |
| TW202334036A (zh) | 2023-09-01 |
| EP4421039A8 (en) | 2024-10-16 |
| JP2024538220A (ja) | 2024-10-18 |
| KR20240093797A (ko) | 2024-06-24 |
| TWI909103B (zh) | 2025-12-21 |
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