CN103826745A - Method for coating a catalysed particulate filter and a particulate filter - Google Patents

Method for coating a catalysed particulate filter and a particulate filter Download PDF

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Publication number
CN103826745A
CN103826745A CN201280034636.7A CN201280034636A CN103826745A CN 103826745 A CN103826745 A CN 103826745A CN 201280034636 A CN201280034636 A CN 201280034636A CN 103826745 A CN103826745 A CN 103826745A
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Prior art keywords
catalyst
carbon monoxide
filter
ammonia
activated
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CN201280034636.7A
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Chinese (zh)
Inventor
P.L.加布里伊尔森
K.约翰森
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Topsoe AS
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Haldor Topsoe AS
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    • 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
    • B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
    • B01D53/9463—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick
    • B01D53/9468—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on one brick in different layers
    • 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
    • B01J35/56—
    • 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
    • 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
    • B01J37/0244—Coatings comprising several layers
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/24—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 constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2832—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support granular, e.g. pellets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1023—Palladium
    • 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
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20761—Copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/50—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
    • 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
    • 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
    • B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
    • 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
    • B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
    • B01J23/56—Platinum group metals
    • B01J23/63—Platinum group metals with rare earths or actinides
    • 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
    • B01J29/82—Phosphates
    • B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
    • B01J29/85—Silicoaluminophosphates (SAPO compounds)
    • 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
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0027—Powdering
    • B01J37/0036—Grinding
    • 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
    • B01J37/0219—Coating the coating containing organic compounds
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0684—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having more than one coating layer, e.g. multi-layered coatings
    • 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 ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/2073—Selective catalytic reduction [SCR] with means for generating a reducing substance from the exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

Method for the preparation of a wall flow particulate filter catalysed at its inlet side with a first catalyst having activity in the removal of residual hydrocarbons and carbon monoxide and catalysing at rich burn engine operation conditions the reaction of nitrogen oxides with hydrogen and/or carbon monoxide to ammonia and catalysed at its outlet side with a second catalyst having activity in the selective reduction of NOx by reaction with ammonia being formed in the inlet side. The method involves the provision of a first catalyst having a particle size smaller than the filter wall mean pore size, and a second catalyst having a particle size larger than the filter wall mean pore size, and mixing the first and second catalyst into one suspension, which is used for washcoating from the outlet end. The first catalyst thereby diffuses into the partition wall.

Description

Method and the particulate filter of the particulate filter of coating catalysis
The present invention relates to the engine exhaust particulate filter of multi-functional catalysis.Specifically, the present invention is the method for particulate filter of the multi-functional catalysis of preparation, described three-way catalyst (TWC) and passing through known NH particulate filter for 3-SCR (SCR) technique is removed the activated catalyst of nitrogen oxide aspect tool and is optionally used in excess of ammonia is oxidized to the activated catalyst of nitrogen aspect tool.
The filter of described multi-functional catalysis especially can be used for purifying the Exhaust Gas from the lean-burn gasoline engine such as gasoline direct injection (GDI) engine.
Compared with gasoline premix jet engine, GDI engine produces more carbonaceous cigarette ash.In Europe, following expectation is by Europe 5+ diesel oil rules for GDI, and wherein the granular mass limit is 4.5mg/km, and this need to filter engine exhaust to reach the above-mentioned limit.
Conventionally, the filter using in automobile application is the wall flow pattern filter being made up of honeycomb structure, and wherein particulate matter is captured on the partition of honeycomb or in these partitions.These filters have the multiple longitudinal flow passages that separated by breathable partition.Gas access passage is open and open and in arrival end sealing at the port of export at port of export sealing and gas vent passage relatively in its gas access side, thereby the air-flow that enters wall-flow filter is forced to by partition, enters afterwards exit passageway.
Except soot particle, also contain nitrogen oxide (NO from petrolic Exhaust Gas x), carbon monoxide and unburned hydrocarbon, they are representing the compound of healthy and environmental hazard and must from Exhaust Gas, reduce or remove.
By NO x, carbon monoxide and hydrocarbon remove or reduce that itself is known in the art to obtain the activated catalyst in innoxious compound aspect.
Patent documentation discloses the numerous cleaning systems for remove comprising of hazardous compound of independent catalyst unit from engine exhaust.
Also known with the oxidation of catalytic hydrocarbon and particulate matter and by adding ammonia react in Exhaust Gas and SCR (SCR) NO with former state or as its precursor in this area xcatalyst coated Exhaust Gas particulate filter.
The multifunctional diesel engine particulate filter that also the known different catalysts with the above-mentioned reaction of catalysis is coated with in the art.
In known multi-functional filter, different catalyst is coated with in the not same district of filter segmentation or subregion.
By different catalysts segmentation or Zone coated on filter, be a costliness and difficulty preparation technology.
Compared with known technology, the present invention proposes preparation for ammonia selective reducing nitrogen oxide with remove the better simply method of the particulate filter of the different catalysts catalysis of hydrocarbon, carbon monoxide and excess of ammonia.
Therefore, the invention provides the method for the wall-flow filter of preparation catalysis, it comprises the following steps:
A) provide and there is the multiple longitudinal entrance flow channel being separated by breathable porous partition and the wall-flow filter body that exports flow channel;
B) provide catalyst carrier coating, it is included in and makes nitrogen oxide and carbon monoxide and hydrogen reaction form activated the first carbon monoxide-olefin polymeric in ammonia aspect, and at activated the second carbon monoxide-olefin polymeric aspect catalyzing and reducing nitrogen oxides by making nitrogen oxide and ammonia react form nitrogen, described the first carbon monoxide-olefin polymeric has the granularity of the average pore size that is less than described porous partition and described the second carbon monoxide-olefin polymeric and has the granularity of the average pore size that is greater than described porous partition;
C) use described catalyst carrier coating to be coated with described filter body by described washcoat being introduced to the port of export of described exit passageway; With
D) filter body being coated with described in dry also heat treatment is to obtain the particulate filter of described catalysis.
Described the first catalyst has the granularity less than the average pore size of described partition and described the second catalyst particle has the granularity larger than the average pore size of described wall, and these two advantages will allow the first catalyst particle effectively spread in partition and prevent that the second catalyst from spreading in the passage that does not wherein wish this specific catalytic activity.
Therefore can there is with single washcoat coating the filter body of the entrance and exit flow channel of different catalysts.
By following reaction: NO x+ H 2/ CO=NH 3+ CO 2+ H 2o makes NO xthe useful catalyst that reaction forms ammonia has: palladium; Platinum; The mixture of palladium and rhodium; And the mixture of palladium, platinum and rhodium.
The formation that these catalyst are catalysis ammonia under λ <1 in petrolic fuel-rich operating condition.Palladium is preferred catalyst, and wherein ammonia formation degree is the highest.
The ammonia infiltration so forming in access road by above-mentioned reaction enters exit passageway through the partition of filter and during fuel-rich operating condition (rich operating condition), is adsorbed in the SCR catalyst in outlet flow channel.
Ammonia forms catalyst and SCR catalyst is preferably deposited on respectively in the face of on the partition in the side of access road and in the face of on the partition in the side of exit passageway.
In the operation cycle of fuel-sean subsequently of engine, the NO existing in Exhaust Gas xreact below occurring with the ammonia storing in SCR catalyst:
NO x?+?NH 3?=?N 2?+?H 2O。
As above mentioned, SCR catalyst is own known in the art.For using in the present invention, aspect selective reducing nitrogen oxide activated preferred catalyst comprise the zeolite of zeolite, silica aluminum phosphate (silica aluminium phosohate), ion-exchange, at least one in silica aluminum phosphate, one or more base metal oxides of promoting with iron and/or copper.
Another the preferred SCR catalyst using in the present invention for the silica aluminum phosphate with chabazite structure of copper and/or iron promotion as SAPO 34.
In order to remove not and NO xthe excess of ammonia of reaction, in one embodiment of the invention, described wall-flow filter comprises the ammoxidation catalyst being arranged at least in each outlet flow channel in the port of export region of described filter extraly.
Preferred ammoxidation catalyst comprises palladium, platinum or its mixture.
By contacting with described ammoxidation catalyst, ammoxidation is become to nitrogen G&W.
Described ammoxidation catalyst can provide on the partition in the exit passageway of filter or as the lip-deep superficial layer at SCR catalyst layer by Direct precipitation in exit region.
The present invention provides the method for the wall-flow filter of preparation catalysis in addition.
In embodiment widely, the invention provides the method for the wall-flow filter of preparation catalysis, it comprises the following steps:
A) provide and there is the multiple longitudinal entrance flow channel being separated by breathable porous partition and the wall-flow filter body that exports flow channel;
B) provide catalyst carrier coating, it is included in and makes nitrogen oxide and carbon monoxide and hydrogen reaction form activated the first carbon monoxide-olefin polymeric in ammonia aspect, and at activated the second carbon monoxide-olefin polymeric aspect catalyzing and reducing nitrogen oxides by making nitrogen oxide and ammonia react form nitrogen, described the first carbon monoxide-olefin polymeric has the mode granularity (mode particle size) of the average pore size that is less than described porous partition and described the second carbon monoxide-olefin polymeric and has the mode granularity of the average pore size that is greater than described porous partition;
C) use described catalyst carrier coating to be coated with described filter body by described washcoat being introduced to the port of export of described exit passageway; With
D) filter body being coated with described in dry also heat treatment is to obtain the particulate filter of described catalysis.
The concrete carbon monoxide-olefin polymeric using is in the present invention mentioned hereinbefore and is further open in claim 2-4.
In another embodiment of the present invention, described filter is used so-called escape ammonia catalyst (ammonia slip catalyst) coating in addition, and described escape ammonia catalyst is for being oxidized to excess of ammonia activated catalyst aspect nitrogen G&W.
Therefore, in this embodiment, method of the present invention comprises the following steps:
The Second support coating that contains activated carbon monoxide-olefin polymeric aspect selective oxidation ammonia is provided; With
Be coated with subsequently at least a portion of described exit passageway with described catalyst carrier coating, obtain having the coating of described catalyst carrier coating.
Use in the present invention in preparation washcoat time, optionally in the situation that adding adhesive, viscosity improver, foaming agent or other processing aids, the catalyst with particulate forms is conventionally ground or reunites to needed granularity and it is suspended in water or organic solvent.
The common practice of basis is subsequently carried out washcoated to described filter, be included in described filter and apply vacuum, the washcoated or dip-coating of pressurizeing.
The amount that is coated on the first catalyst on described filter is generally 10-140g/l, and the amount that is coated on the second catalyst on described filter is generally 10-100g/l.Be carried in total catalyst on described filter conventionally within the scope of 40-200g/l.
The example of the suitable filter material using in the present invention has carborundum, aluminium titanates, cordierite, aluminium oxide, mullite or its combination.
Embodiment
The suspension of the first carbon monoxide-olefin polymeric is prepared by the aluminium oxide particles that is deposited on the mixture of powders of the palladium rhodium on cerium oxide and granularity and is less than filter wall average pore size in first step.
The suspension of the first catalyst mixture by mixing these powder of 20g to prepare in 40ml demineralized water/L filter.Add dispersant Zephrym PD-7000 and defoamer.This suspension is ground in bead mills.The granularity of final suspension must be less than the average pore size in the hole in the wall of wall-flow filter.
The suspension of the second catalyst is by mixing and disperseing the 100g silica aluminum phosphate SAPO-34 that 2% bronze medal promotes to prepare in 200ml demineralized water/L filter.Add dispersant Zephrym PD-7000 and defoamer.Described granularity must be greater than the average pore size in the hole in the wall of wall-flow filter.
Subsequently the suspension of the first catalyst and the second catalyst is mixed into a kind of suspension.
Use high porosity (approximately 60% and wall average pore size be approximately 18 μ conventional connector SiC wall-flow filters m).
The mixing suspension of the first catalyst and the second catalyst is passed through to the filter outlet end washcoated per-meate side of standard vector coating method from filter per-meate side, be dried and calcining at 750 ℃.

Claims (6)

1. the method for the wall-flow filter of preparation catalysis, it comprises the following steps:
A) provide and there is the multiple longitudinal entrance flow channel being separated by breathable porous partition and the wall-flow filter body that exports flow channel;
B) provide catalyst carrier coating, it is included in and makes nitrogen oxide and carbon monoxide and hydrogen reaction form activated the first carbon monoxide-olefin polymeric in ammonia aspect, and at activated the second carbon monoxide-olefin polymeric aspect selective reducing nitrogen oxide by making nitrogen oxide and ammonia react form nitrogen, described the first carbon monoxide-olefin polymeric has the mode granularity of the average pore size that is less than described porous partition and described the second carbon monoxide-olefin polymeric and has the mode granularity of the average pore size that is greater than described porous partition;
C) use described catalyst carrier coating to be coated with described filter body by described washcoat being introduced to the port of export of described exit passageway; With
D) filter body being coated with described in dry also heat treatment is to obtain the particulate filter of described catalysis.
2. the process of claim 1 wherein and comprise palladium at activated catalyst aspect conversion of nitrogen oxides ammonification; Platinum; The mixture of palladium and rhodium; Mixture with palladium, platinum and rhodium.
3. the process of claim 1 wherein and formed by palladium at activated catalyst aspect conversion of nitrogen oxides ammonification.
4. the method for any one in claim 1-3, wherein aspect selective reducing nitrogen oxide activated catalyst comprise the zeolite of zeolite, silica aluminum phosphate, ion-exchange, at least one in silica aluminum phosphate, one or more base metal oxides of promoting with iron and/or copper.
5. the method for any one in aforementioned claim, it is further comprising the steps of:
The Second support coating that contains activated carbon monoxide-olefin polymeric aspect oxidation ammonia is provided; With
Be coated on a part of exit passageway in the region of the described port of export with described Second support coating.
6. the wall-flow filter of the catalysis of preparing according to any one in aforementioned claim.
CN201280034636.7A 2011-07-13 2012-06-14 Method for coating a catalysed particulate filter and a particulate filter Pending CN103826745A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DKPA201100537 2011-07-13
DKPA201100537 2011-07-13
PCT/EP2012/061328 WO2013007466A1 (en) 2011-07-13 2012-06-14 Method for coating a catalysed particulate filter and a particulate filter

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CN103826745A true CN103826745A (en) 2014-05-28

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BR112014000287A2 (en) 2017-02-14
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US20140170033A1 (en) 2014-06-19
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WO2013007466A1 (en) 2013-01-17
JP2014524833A (en) 2014-09-25

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