EP1565251A2 - Procede pour appliquer un revetement a action catalytique sur un support de catalyseur presentant deux structures partielles differentes et catalyseur ainsi obtenu - Google Patents

Procede pour appliquer un revetement a action catalytique sur un support de catalyseur presentant deux structures partielles differentes et catalyseur ainsi obtenu

Info

Publication number
EP1565251A2
EP1565251A2 EP03789004A EP03789004A EP1565251A2 EP 1565251 A2 EP1565251 A2 EP 1565251A2 EP 03789004 A EP03789004 A EP 03789004A EP 03789004 A EP03789004 A EP 03789004A EP 1565251 A2 EP1565251 A2 EP 1565251A2
Authority
EP
European Patent Office
Prior art keywords
coating
catalyst
partial structure
catalytically active
catalyst support
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Withdrawn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
EP03789004A
Other languages
German (de)
English (en)
Inventor
Rainer Domesle
Thomas Kreuzer
Egbert Lox
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 EP1565251A2 publication Critical patent/EP1565251A2/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
    • 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
    • B01J35/19—Catalysts containing parts with different compositions
    • 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
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
    • 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
    • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
    • B01J35/58—Fabrics or filaments
    • 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
    • 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
    • B01J37/0217—Pretreatment of the substrate before coating
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool

Definitions

  • the present invention relates to a method for coating a catalyst carrier which contains two different substructures with a catalytically active coating, and to the catalysts obtained with this method.
  • Catalyst supports that contain two different substructures are increasingly being used in the field of automotive exhaust gas catalysis. These are primarily filter bodies for the removal of soot particles from the exhaust gas, in particular from diesel engines.
  • So-called wall flow filters are widely used. These are monolithic filter bodies with a cylindrical shape that are traversed by an inlet end surface to an outlet end surface by parallel flow channels for the exhaust gas.
  • the filter bodies consist of a uniform porous ceramic material and are manufactured, for example, by extrusion.
  • the flow channels at the inlet and outlet end faces are mutually closed, so that the flow channels are divided into inlet and outlet channels and the exhaust gas as it flows through the filter body from the inlet channels through the porous partition walls between the channels into the Discharge channels must cross.
  • the soot particles contained in the exhaust gas are filtered out of the exhaust gas stream and deposited on the walls of the inlet channels.
  • the filter bodies of this filter type contain gas-impermeable first layers and gas-permeable second layers, which are arranged in such a way that channels for the exhaust gas to flow through are formed.
  • the gas-permeable second layers consist of porous filter mats and the gas-impermeable first layers are provided with blades which protrude into the flow-through channels and mainly direct the exhaust gas onto the porous second layers and lead them through them.
  • a particular advantage of these filters is their reduced tendency to become blocked due to soot deposits.
  • These filters therefore contain two different substructures, namely the porous filter mats and the gas-impermeable first layers.
  • Filterkö ⁇ er This type is also referred to below as filter catalysts in order to distinguish them from the wall-flow filters.
  • the filter can be coated catalytically.
  • These coatings can be oxidation-active coatings which contain platinum and / or palladium as catalytically active components, or else so-called soot ignition coatings which contain, for example, cerium oxide and / or vanadium oxide. Coatings with other catalytic effects such as the storage of nitrogen oxides and the selective catalytic reduction of nitrogen oxides with ammonia are also known.
  • the catalytic coatings of these filters are preferably so-called dispersion coatings, in which the catalytically active components are present in finely dispersed form on finely divided support materials such as active aluminum oxide. This type of coating ensures optimal utilization of the catalytic potential of the catalytically active components.
  • the support materials covered with the catalytically active components are referred to below as catalyst material.
  • the catalyst material is first dispersed in a carrier liquid, usually water.
  • a carrier liquid usually water.
  • the filter bodies are then, for example, poured with the dispersion, immersed in the dispersion, or the dispersion is sucked into or pumped into the filter bodies. Excess coating dispersion is then removed by blowing out with compressed air or by suction.
  • the coating is then dried and / or calcined at temperatures between 300 and 900 ° C. In a preferred embodiment, the temperature treatment takes place between 300 and 700 ° C.
  • the techniques described here are known to the person skilled in the field of automotive exhaust gas analysis and therefore do not require a more detailed explanation.
  • a major problem in the coating of filter catalysts is that their two substructures have different absorption capacities for the coating dispersion.
  • most of the coating dispersion applied to the filter body is deposited in the porous filter mat. This clogs the pores and thus the filter effect destroyed.
  • the filter body then acts only as a simple flow monolith with increased exhaust gas back pressure.
  • a method is to be made available which allows a catalytic support which contains two different partial structures, which are distinguished by a different absorption capacity for a coating dispersion, to be coated with a catalytically active coating, the coating concentrations on the partial structures being largely should be adjustable independently of each other.
  • a porous partial structure of the catalyst support is impaired in its function or even becomes completely unusable due to excessive deposition of coating dispersion.
  • the absorption capacity of at least one partial structure is changed by pre-loading the catalyst support and the catalytic coating is then applied.
  • the absorption capacity of the substructures is preferably changed relative to one another.
  • the absorption capacity is changed by pore filling, hydrophilic and / or hydrophobic finishing of the partial structure (s).
  • the absorption capacity is preferably changed by filling the pores and / or by hydrophobicizing the partial structures).
  • the catalytic coating is preferably applied to the filter body in a known manner. After application, the coating is dried and / or calcined. In a preferred embodiment, the drying and / or calcining takes place after the application of the catalytic material and after the pre-loading with at least one pre-loading medium.
  • the pre-assignment medium is expelled during the temperature treatment for the catalytic coating.
  • the preallocation agent is driven out by means of additional measures, such as preferably a further temperature treatment.
  • the catalyst support is preferably pre-loaded with at least one combustible material and / or at least one evaporable or evaporable material as the pre-loading medium.
  • a water-miscible liquid, a non-water-miscible liquid or water is preferably used as the vaporizable or evaporable material.
  • Polyvinyl alcohol, wax or other hydrophobic substances are preferably used as the burnable material. In a preferred embodiment of the invention, these are applied in dissolved form or as an emulsion and are preferably dried before the catalytic coating is applied. In this way, a hydrophobic finish is preferably produced on at least one partial structure.
  • Water-miscible liquids such as alcohols or non-water-miscible organic liquids such as hydrocarbons are preferably used for pre-filling and pore filling. Water is particularly preferably used.
  • the method is particularly suitable for the coating of so-called filter catalysts, which are characterized by two partial structures of different porosity and thus different absorption capacity for the coating dispersion.
  • a first partial structure of the filter catalysts contains, for example, a porous filter mat, while a second partial structure has a non-porous, for example smooth, metal foil.
  • the catalyst support is preferably pre-loaded by contacting it with at least one pre-loading medium.
  • the catalyst support is preferably pre-filled by immersion in water or liquid wax.
  • the pores of the porous partial structure are partially or completely filled with the pre-loading liquid, so that during the subsequent coating the coating dispersion can no longer penetrate into the depth of the porous partial structure.
  • the partial filling can be stopped by blowing or drying after the catalyst support has been completely immersed.
  • Another particularly suitable method is suction, in which the body is placed with one end face in a liquid and this selectively rises in the porous partial structure of the catalyst carrier by means of capillary forces. This measure allows the absorption capacity of the two substructures for the coating dispersion to be changed relative to one another.
  • the at least one pre-assignment medium has a catalytically active material or a pre-stage thereof.
  • the catalytically active material or its precursor After being expelled, the catalytically active material or its precursor remains on at least one, preferably the porous, partial structure and thus forms an additional catalytic coating.
  • cerium nitrate is added to the water, which remains after application of the coating dispersion, preferably on the non-porous partial structure, after drying and / or calcination in the form of cerium oxide on the porous partial structure.
  • a catalyst can thus be formed which has coatings of different composition and / or function on at least one partial structure and / or on the partial structures.
  • a maximum of 80, preferably a maximum of 50 and particularly preferably only 30% of the total coating composition is deposited on the nonwoven. This prevents the filter function of the porous partial structure of the filter catalyst from being destroyed by the coating.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)
  • Filtering Materials (AREA)

Abstract

L'invention concerne un procédé pour appliquer un revêtement à action catalytique sur un support de catalyseur à l'aide d'une dispersion de revêtement, lequel support de catalyseur présente au moins deux structures partielles qui se distinguent par leur capacité à absorber cette dispersion de revêtement. Ledit procédé se caractérise en ce que la capacité d'absorption des structures partielles est modifiée par la pré-application d'une matière combustible ou d'un liquide sur le support de catalyseur puis le revêtement catalytique est appliqué par une méthode connue sur le corps filtrant, séché et/ou calciné.
EP03789004A 2002-11-22 2003-11-04 Procede pour appliquer un revetement a action catalytique sur un support de catalyseur presentant deux structures partielles differentes et catalyseur ainsi obtenu Withdrawn EP1565251A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10254661 2002-11-22
DE10254661A DE10254661A1 (de) 2002-11-22 2002-11-22 Verfahren zur Beschichtung eines Katalysatorträgers enthaltend zwei unterschiedliche Teilstrukturen mit einer katalytisch aktiven Beschichtung und dadurch erhaltener Katalysator
PCT/EP2003/012298 WO2004047958A2 (fr) 2002-11-22 2003-11-04 Procede pour appliquer un revetement a action catalytique sur un support de catalyseur presentant deux structures partielles differentes et catalyseur ainsi obtenu

Publications (1)

Publication Number Publication Date
EP1565251A2 true EP1565251A2 (fr) 2005-08-24

Family

ID=32308666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03789004A Withdrawn EP1565251A2 (fr) 2002-11-22 2003-11-04 Procede pour appliquer un revetement a action catalytique sur un support de catalyseur presentant deux structures partielles differentes et catalyseur ainsi obtenu

Country Status (10)

Country Link
US (1) US7811969B2 (fr)
EP (1) EP1565251A2 (fr)
JP (1) JP4488212B2 (fr)
KR (1) KR100981595B1 (fr)
CN (1) CN100386506C (fr)
AU (1) AU2003293655A1 (fr)
CA (1) CA2506361C (fr)
DE (1) DE10254661A1 (fr)
WO (1) WO2004047958A2 (fr)
ZA (1) ZA200504013B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004040549B4 (de) * 2004-08-21 2017-03-23 Umicore Ag & Co. Kg Katalytisch beschichtetes Partikelfilter und seine Verwendung
DE102005062317B4 (de) 2005-12-24 2008-08-21 Umicore Ag & Co. Kg Verfahren zur katalytischen Beschichtung von keramischen Wabenkörpern
DE102007056213A1 (de) * 2007-11-22 2009-05-28 Robert Bosch Gmbh Verfahren zur Herstellung eines von Abgas durchströmbaren Formkörpers sowie Abgasanlage einer Brennkraftmaschine
US7867936B2 (en) * 2007-11-29 2011-01-11 Corning Incorporated Process for passivating porous ceramic articles and an article made therefrom
DE102016202610A1 (de) * 2016-02-19 2017-08-24 Dürr Systems GmbH Verfahren zur Herstellung eines porösen Funktionskörpers
US10525503B2 (en) 2016-02-24 2020-01-07 Halder Topsoe A/S Method for the preparation of a catalysed monolith
CN109647088B (zh) * 2018-12-26 2021-07-27 中自环保科技股份有限公司 一种低背压和高碳烟过滤效率柴油颗粒过滤器的制备方法
CN114588900A (zh) * 2022-02-19 2022-06-07 中自环保科技股份有限公司 一种汽油机颗粒捕集催化剂及其制备方法

Citations (1)

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DE19704147A1 (de) * 1997-02-04 1998-08-06 Emitec Emissionstechnologie Hitzebeständiger und regenerierbarer Filterkörper mit Strömungswegen

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DE10020170C1 (de) 2000-04-25 2001-09-06 Emitec Emissionstechnologie Verfahren zum Entfernen von Rußpartikeln aus einem Abgas und zugehöriges Auffangelement
DE3643605C1 (de) * 1986-12-19 1988-07-14 Otto Feuerfest Gmbh Traegerkatalysator,Verfahren zu seiner Herstellung und seine Verwendung zur Reduktion von Stickoxiden
JPH01270948A (ja) * 1988-04-22 1989-10-30 Mazda Motor Corp 金属製担体触媒の製造方法
DE4006346A1 (de) * 1990-03-01 1991-09-05 Degussa Verfahren zur herstellung von monolith-katalysatoren mit verbesserten thermoschockeigenschaften
DE4233404C2 (de) * 1992-10-05 1994-08-18 Degussa Monolithischer Metallträgerkatalysator mit einem katalytisch beschichteten Wabenkörper
DE4406431C2 (de) * 1994-02-28 1996-06-05 Bosch Gmbh Robert Verfahren zur Herstellung poröser,gaspermeabler, katalytisch wirksamer Teile mit inneren Oberflächen
JP3462750B2 (ja) 1998-05-14 2003-11-05 住友電気工業株式会社 ディーゼルエンジン用パティキュレートトラップ
JP4259703B2 (ja) 1999-12-07 2009-04-30 株式会社デンソー セラミックスハニカム構造体及びその製造方法
DE19962544A1 (de) * 1999-12-23 2001-07-19 Degussa Verfahren zum Beschichten eines keramischen Wabenkörpers
DE10026696A1 (de) 2000-05-30 2001-12-20 Emitec Emissionstechnologie Partikelfalle
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JP2002180818A (ja) 2000-12-14 2002-06-26 Toyota Motor Corp 内燃機関の排気ガス浄化装置
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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
KR100981595B1 (ko) 2010-09-13
AU2003293655A8 (en) 2004-06-18
CN1720390A (zh) 2006-01-11
CA2506361C (fr) 2011-08-23
CA2506361A1 (fr) 2004-06-10
WO2004047958A3 (fr) 2004-08-26
US7811969B2 (en) 2010-10-12
DE10254661A1 (de) 2004-06-09
CN100386506C (zh) 2008-05-07
WO2004047958A2 (fr) 2004-06-10
KR20050085070A (ko) 2005-08-29
JP4488212B2 (ja) 2010-06-23
AU2003293655A1 (en) 2004-06-18
US20060154816A1 (en) 2006-07-13
ZA200504013B (en) 2006-03-29
JP2006507113A (ja) 2006-03-02

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