EP3694643A1 - Catalyseur à réduction catalytique sélective - Google Patents

Catalyseur à réduction catalytique sélective

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Publication number
EP3694643A1
EP3694643A1 EP18773183.1A EP18773183A EP3694643A1 EP 3694643 A1 EP3694643 A1 EP 3694643A1 EP 18773183 A EP18773183 A EP 18773183A EP 3694643 A1 EP3694643 A1 EP 3694643A1
Authority
EP
European Patent Office
Prior art keywords
catalyst according
iron
catalyst
sodium
zeolite
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP18773183.1A
Other languages
German (de)
English (en)
Inventor
Fei WEN
Nicola Soeger
Yvonne Demel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Umicore AG and Co KG
Original Assignee
Umicore AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Umicore AG and Co KG filed Critical Umicore AG and Co KG
Publication of EP3694643A1 publication Critical patent/EP3694643A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
    • B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
    • B01J29/76—Iron group metals or copper
    • B01J29/7615—Zeolite Beta
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9413—Processes characterised by a specific catalyst
    • B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/42—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/613—10-100 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
    • B01J35/61—Surface area
    • B01J35/615—100-500 m2/g
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/0215—Coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/02—Impregnation, coating or precipitation
    • B01J37/024—Multiple impregnation or coating
    • B01J37/0246—Coatings comprising a zeolite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/202—Alkali metals
    • B01D2255/2027—Sodium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20738—Iron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—Zeolites
    • B01D2255/502—Beta zeolites
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/915—Catalyst supported on particulate filters
    • B01D2255/9155—Wall flow filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
    • B01J2229/10—After treatment, characterised by the effect to be obtained
    • B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
    • B01J2229/186—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself not in framework positions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea

Definitions

  • the present invention relates to an SCR-active catalyst for
  • Exhaust gases from motor vehicles with a predominantly lean-burn internal combustion engine contain, in addition to particulate emissions, in particular the primary emissions carbon monoxide CO, hydrocarbons HC and
  • Nitrogen oxides NOx Due to the relatively high oxygen content of up to 15% by volume, carbon monoxide and hydrocarbons can be rendered relatively harmless by oxidation. The reduction of nitrogen oxides to nitrogen, however, is much more difficult.
  • One known method of removing nitrogen oxides from exhaust gases in the presence of oxygen is selective catalytic reduction (SCR) using ammonia on a suitable catalyst.
  • SCR selective catalytic reduction
  • the nitrogen oxides to be removed from the exhaust gas are reacted with ammonia to nitrogen and water.
  • the ammonia used as the reducing agent can be prepared by metering in an ammonia precursor compound, such as urea, ammonium carbamate or
  • Ammonium formate are made available in the exhaust system and subsequent hydrolysis.
  • zeolites As SCR catalysts, for example, certain metal-exchanged zeolites can be used. Zeolites are often divided into large, medium and small pore zeolites by the ring size of their largest pore openings. Large pore zeolites have a maximum ring size of 12 tetrahedrally coordinated atoms and medium pore zeolites one of 10. Small pore zeolites have a maximum ring size of 8.
  • SCR catalysts based on iron-exchanged ⁇ -zeolites ie one large pore zeolites of the structural type BEA, used.
  • WO02 / 41991 A2 discloses a heat treatment in the presence of water vapor. It should form alumina chains that are not part of the three-dimensional zeolite structure, but are still associated with this or even bound to them.
  • WO03 / 022430 A2 teaches to improve the hydrothermal stability of an Fe-.beta.-zeolite by increasing the Fe (OH) content in the catalyst.
  • the increase in the Fe (OH) content is to be achieved, inter alia, that the sodium content of the zeolite is brought to less than 500 ppm before the iron exchange.
  • Fe-.beta.-zeolites are hydrothermally stable if, contrary to the teaching of WO03 / 022430 A2, they contain a certain amount of sodium which is 500 ppm or higher.
  • the present invention relates to an iron-containing zeolite of the structural type BEA, which is characterized in that it contains sodium in an amount of 0.05 to 1 wt .-%, based on the iron-exchanged zeolites and calculated as sodium metal.
  • the catalyst of the invention may contain iron in various forms. In particular, it is present in ion-exchanged form. This means that by formal replacement of Si 4+ - by Al 3+ ions in the Zeolite skeleton negative charge is neutralized by means of a corresponding amount of iron cations.
  • the iron may also be partially present as iron metal and / or as iron oxide in the zeolite structure and / or on the surface of the zeolite structure.
  • Zeolites of structural type BEA are known in the art and can be purchased on the market.
  • the products known by the name "Beta” or " ⁇ ” find many uses, i.a. also for the production of catalysts for the selective reduction of nitrogen oxides from the exhaust gas of internal combustion engines with ammonia.
  • iron or containing iron zeolites of the structural type BEA can be purchased. Alternatively, however, they can also be obtained by aqueous ion exchange or solid-state ion exchange according to methods known per se.
  • the iron-containing zeolite of the structural type BEA according to the invention has an iron content of 1 to 10% by weight, preferably 3 to 6% by weight, based on the iron-containing zeolite and calculated as
  • the zeolite of the structure type BEA has, in particular, a SAR (silica-to-alumina molar ratio) of from 1 to 50, preferably from 5 to 35. Particularly preferred SAR values are 5 to 15, most preferred SAR values are 7 to 12
  • the content of sodium is according to the invention at 0.05 to 1 wt .-%, based on the iron-containing zeolites and calculated as
  • the sodium metal is especially in
  • ion-exchanged form may also be present in part as sodium oxide in the zeolite structure and / or on the surface of the zeolite structure.
  • the iron-containing structure-type zeolites BEA according to the invention can be prepared, for example, in a simple manner and in a manner known per se, that the zeolite in a first step with an iron compound, for example a water-soluble iron compound and in a second step with a sodium compound, for example a water-soluble sodium compound , is offset.
  • an iron compound for example a water-soluble iron compound
  • a sodium compound for example a water-soluble sodium compound
  • iron (III) nitrate has proved to be suitable as the iron compound, while, for example, sodium nitrate, sodium sulfate, sodium chloride, sodium acetate or sodium formate are suitable as the sodium compound.
  • the zeolite may also in the first step with a water-soluble sodium compound and in the second step with a water-soluble
  • Carrier substrates may be so-called flow-through substrates or wall-flow filters. Both can be made of inert materials, for example of silicon carbide,
  • Aluminum titanate or cordierite Such carrier substrates are known to the person skilled in the art and are available on the market.
  • the application of the catalyst according to the invention to the carrier substrate can be carried out by methods familiar to the person skilled in the art, for example by the customary dip coating methods or pumping and suction coating methods followed by thermal aftertreatment (calcination).
  • Inventive catalyst can be coordinated so that the resulting coating on the porous walls, the forming the channels of the wall flow filter lie (on-wall coating). But are preferred average pore size and medium
  • Particle size of the catalyst according to the invention be small enough to penetrate into the pores of the wall flow filter.
  • it is itself present as part of a carrier substrate, that is, for example, a flow-through substrate or also a wall-flow filter.
  • these carrier substrates contain a matrix component. As matrix components, all else to
  • catalyst substrates used in inert materials used so for example, silicates, oxides, nitrides or carbides.
  • catalytically active carrier substrates for example, a mixture of, for example, 10 to 95% by weight of inert matrix component and 5 to 90% by weight of catalytically active material is extruded by methods known per se.
  • support substrates constructed of corrugated sheets of inert materials may also be used.
  • Suitable inert materials are for example fibrous materials with a
  • fibrous materials are heat-resistant and consist of silicon dioxide, in particular of glass fibers.
  • sheets of said fiber materials are corrugated in a known manner, and the individual corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the individual corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the individual corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the individual corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the individual corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the individual corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the corrugated sheets are formed into a cylindrical monolithically structured body with channels passing through the body.
  • the corrugated sheets are formed
  • Substrates of corrugated sheets can be coated directly with the catalyst according to the invention, but preferably they are first coated with an inert material, for example titanium dioxide, and only then with the catalytic material.
  • an inert material for example titanium dioxide
  • the catalyst according to the invention can advantageously be used for purifying exhaust gas from lean-burn internal combustion engines, in particular diesel engines. It converts nitrogen oxides contained in the exhaust gas into the harmless compounds nitrogen and water.
  • the present invention accordingly also relates to a method for
  • the reducing agent used in the process according to the invention is preferably ammonia.
  • the required ammonia can be formed for example in the exhaust system upstream of the particle filter according to the invention, for example by means of an upstream nitrogen oxide storage catalyst (Jean NOx trap - LNT). This process is known as "passive SCR.”
  • ammonia can also be carried in suitable form, such as urea, ammonium carbamate, or ammonium formate, and added to the exhaust gas stream as needed metered into the catalyst according to the invention via an injector on the inflow side.
  • the present invention thus also relates to a system for purifying exhaust gas from lean-burn internal combustion engines, which is characterized in that it comprises a catalyst according to the invention, preferably in the form of a coating on a carrier substrate or as part of a carrier substrate, and an injector for aqueous
  • the present invention thus also relates to a system for purifying exhaust gas of lean-burn internal combustion engines, which is characterized in that it comprises an oxidation catalyst, an injector for aqueous urea solution and a catalyst according to the invention, preferably in the form of a coating on a carrier substrate or as part of a carrier substrate , having.
  • the oxidation catalyst used is platinum on a support material.
  • Suitable carrier material for the platinum are all those skilled in the art for this purpose materials into consideration. They have a BET surface area of from 30 to 250 m 2 / g, preferably from 100 to 200 m 2 / g (determined to DIN 66132) and are in particular aluminum oxide, silicon oxide,
  • the system according to the invention is used such that an oxidation catalyst, then an aqueous urea solution injector and finally a catalyst according to the invention are arranged in the flow direction of the exhaust gas.
  • the oxidation catalyst is typically as
  • Carrier substrates can be any suitable carrier substrate before.
  • Flow-through substrates or wall flow filter Flow-through substrates or wall flow filter.
  • the catalyst according to the invention surprisingly has advantages compared to iron-containing zeolites of the structural type BEA, which contain a lower or a higher amount of sodium.
  • FIG. 1 shows the SCR activity from K1 to K4 and also VK1 and VK2 in a hydrothermally aged state (100 hours at 550 ° C.)
  • a commercially available zeolite of the structural type BEA with a SAR of 10 is mixed in water with an amount of Fe (NÜ3) 3, the one
  • Iron content of 4.5 wt .-% (based on the iron-containing zeolite and calculated as Fe 2 03) corresponds, and stirred overnight. Then, sodium nitrate is added in an amount corresponding to 0.5% by weight (based on the iron-containing zeolite and calculated as Na metal) and stirred for 30 minutes.
  • the suspension thus obtained is used directly as a coating suspension (washcoat) for coating a commercially available flow-through substrate made of cordierite.
  • the resulting catalyst (hereinafter referred to as Kl) is dried at 90 ° C, then calcined stepwise at 350 ° C and at 550 ° C in air.
  • Example 1 is repeated with the difference that the amount of sodium nitrate is such that a loading with sodium of 1 wt .-% results.
  • the catalyst thus obtained is hereinafter referred to as K2.
  • Example 1 is repeated with the difference that the amount of sodium nitrate is such that a loading with sodium of 0.1 wt .-% results.
  • the catalyst thus obtained is hereinafter referred to as K3.
  • Example 1 is repeated with the difference that the amount of sodium nitrate is such that a loading with sodium of 0.2 wt .-% results.
  • the catalyst thus obtained is hereinafter referred to as K4.
  • Example 1 is repeated with the difference that the amount of
  • Example 1 is repeated with the difference that the addition of sodium nitrate is dispensed with.
  • the loading of sodium is thus 0 wt .-%.
  • the catalyst thus obtained is hereinafter referred to as VK2.
  • VKl shows the worst overall NOx conversion over the entire temperature range.
  • VK2 is almost equivalent to the catalysts Kl to K4 at higher temperatures, it shows an equally low NOx conversion at lower temperatures than VKl.
  • the catalysts of the invention Kl to K4 significantly better results, especially at low temperatures. This is especially true for Kl and K2 (sodium contents of 0.5 and 1 wt .-%, respectively).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Catalysts (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

La présente invention concerne un catalyseur, un zéolithe contenant du fer et de type de structure BEA, qui contient du sodium dans une quantité de 0,05 à 1 % en poids par rapport au zéolithe échangé par du fer et calculé en tant que sodium métallique.
EP18773183.1A 2017-10-09 2018-09-21 Catalyseur à réduction catalytique sélective Withdrawn EP3694643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17195355 2017-10-09
PCT/EP2018/075660 WO2019072527A1 (fr) 2017-10-09 2018-09-21 Catalyseur à réduction catalytique sélective

Publications (1)

Publication Number Publication Date
EP3694643A1 true EP3694643A1 (fr) 2020-08-19

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EP18773183.1A Withdrawn EP3694643A1 (fr) 2017-10-09 2018-09-21 Catalyseur à réduction catalytique sélective

Country Status (4)

Country Link
US (1) US11298692B2 (fr)
EP (1) EP3694643A1 (fr)
CN (1) CN111278558A (fr)
WO (1) WO2019072527A1 (fr)

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DE102022130469A1 (de) 2022-11-17 2024-05-23 Umicore Ag & Co. Kg Verfahren und Vorrichtung zum Herstellen eines Substrats für eine Abgasnachbehandlungseinrichtung
DE102023117464A1 (de) 2023-07-03 2025-01-09 Umicore Ag & Co. Kg Verfahren und Vorrichtung zum Herstellen eines Substrats für eine Abgasnachbehandlungseinrichtung
DE102023132075A1 (de) * 2023-11-17 2025-05-22 Umicore Ag & Co. Kg Katalytischer Partikelfilter

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US11298692B2 (en) 2022-04-12

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