DE10258693A1 - Coating sheet filter material with catalytic compounds and compatible solvent, sprays dispersion onto sheet to produce particle filters for diesel engines - Google Patents

Coating sheet filter material with catalytic compounds and compatible solvent, sprays dispersion onto sheet to produce particle filters for diesel engines Download PDF

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Publication number
DE10258693A1
DE10258693A1 DE10258693A DE10258693A DE10258693A1 DE 10258693 A1 DE10258693 A1 DE 10258693A1 DE 10258693 A DE10258693 A DE 10258693A DE 10258693 A DE10258693 A DE 10258693A DE 10258693 A1 DE10258693 A1 DE 10258693A1
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Prior art keywords
spraying
dispersion
filter
diesel engines
particle filters
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Granted
Application number
DE10258693A
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German (de)
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DE10258693B4 (en
Inventor
Hermann Josef Schulte
Hans-Peter Frisse
Carsten Jutka
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HJS Emission Technology GmbH and Co KG
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HJS Fahrzeugtechnik GmbH and Co KG
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Priority to DE10258693A priority Critical patent/DE10258693B4/en
Publication of DE10258693A1 publication Critical patent/DE10258693A1/en
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • 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
    • 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
    • B01J37/0215—Coating
    • B01J37/0225—Coating of metal substrates
    • 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

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

Abstract

The dispersion is sprayed onto filter sheeting used to make particle filters for engines, especially diesel engines. Spraying takes place in one or more stages. During one-sided spraying, air pressure on the other side is controlled, to adjust the depth of penetration into the paper by the dispersion. Spraying takes place in continuous operation, the filter sheet passing endlessly below suitable spraying nozzles. The dispersion contains nano-scale ceramic particles. In a further spraying operation, a metallic- or metal oxide catalyst is applied. The filter sheet, coated with sintered metal, is subjected to a process increasing surface roughness, before spraying. The process comprises e.g. slight surface etching or oxidation.

Description

Filterfolien zur Herstellung von Partikelfiltern für z. B. Brennstoffmaschinen, insbesondere für Dieselmotoren, können aus permeablen Drahtgeweben mit gesinterter Metallpulverbeschichtung, aus Streckmetallen mit Metallpulverbeschichtung oder aus Metallfaservliesen, die teilweise ebenfalls mit Metallpulver gesintert sind, bestehen. Aus diesen Folien können beispielsweise monolithische, scheiben- oder zylinderförmige Träger Körper hergestellt werden, die anschließend an ihrer Oberfläche mit Dispersionen aus katalytisch aktiven Komponenten und einem geeigneten Lösungsmittel beschichtet werden.Filter foils for the production of Particle filters for z. B. fuel machines, especially for diesel engines, can permeable wire mesh with sintered metal powder coating, from expanded metals with metal powder coating or from metal fiber fleeces, some of which are also sintered with metal powder. From these slides you can For example, monolithic, disc-shaped or cylindrical carrier bodies are produced be that subsequently on their surface with dispersions of catalytically active components and a suitable one solvent be coated.

Bekannt ist es aus der DE 195 47 598 C1 , die achsparallelen Kanalwandungen in einem solchen Trägerkörper zumindest teilweise zu beschichten, in dem die Beschichtungsdispersion auf die Stirnflächen der Trägerkörper aufgebracht wird. Geeignete Dispersionen (Washcoat) bestehen aus einem sogenannten Washcoat, einem kleingemahlenen keramischen Gut mit einem geeigneten Lösungsmittel und gegebenenfalls mit einem Kleber. Bei diesem Verfahren ist es zwar möglich, den Trägerkörper von beiden Stirnseiten her auch mit unterschiedlichen Dispersionen zu besprühen, es ist jedoch nicht möglich, die Folienseiten unterschiedlich zu behandeln. Nachteilig ist auch bei dieser Aufbringungsart die nicht ohne weiteres kontrollierbare Eindringtiefe der Dispersion und deren Verteilung im Trägerkörper. Bekannte Dispersionen verwenden kleingemahlenes, keramisches Gut mit einer mittleren Korngröße von 3–7 μm.It is known from the DE 195 47 598 C1 to at least partially coat the axially parallel channel walls in such a carrier body by applying the coating dispersion to the end faces of the carrier bodies. Suitable dispersions (washcoat) consist of a so-called washcoat, a finely ground ceramic material with a suitable solvent and optionally with an adhesive. With this method it is possible to spray the carrier body from both ends with different dispersions, but it is not possible to treat the film sides differently. A disadvantage of this type of application is the penetration depth of the dispersion, which is not readily controllable, and its distribution in the carrier body. Known dispersions use finely ground, ceramic material with an average grain size of 3-7 μm.

Die Aufgabe der Erfindung besteht darin, die Beschichtung von Filterfolien für Katalysatoren zu verbessern und zu modifizieren.The object of the invention is in improving the coating of filter foils for catalysts and modify.

Gelöst wird die Erfindungsaufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1, bei dem die Filterfolien in Mattenform durch Aufsprühen der geeigneten Dispersionen (Washcoat) beschichtet werden. Dabei kann die Aufsprühung ein- oder beidseitig und auch in mehreren Durchgängen erfolgen. Es besteht damit die Möglichkeit, diese Filterfolien von beiden Seiten jeweils mit einer unterschiedlichen Dispersion auch in unterschiedlicher Beschichtungsdicke zu behandeln.The invention task is solved by a method having the features of claim 1, in which the Filter films in mat form by spraying on the appropriate dispersions (Washcoat) can be coated. The spraying can or on both sides and also in several passes. So there is the possibility, these filter foils from both sides each with a different dispersion can also be treated in different coating thicknesses.

Um die Einstellung der Eindringtiefe der Dispersion und ggf. auch deren Schichtdicke besser einstellen zu können, wird gemäß Anspruch 3 vorgeschlagen, dass während der einseitigen Besprühung von der Gegenseite der Folie her ein Luftgegendruck aufrechterhalten wird.To set the depth of penetration the dispersion and, if necessary, the layer thickness better to be able is according to claim 3 suggested that during the one-sided spraying of maintain an air back pressure on the opposite side of the film becomes.

Von besonderem Vorteil ist der erfindungsgemäße Vorschlag gemäß Anspruch 5, nachdem die Dispersion nanoskalierte Keramikteilchen enthält. Mit derartig kleinen Keramikteilchen kann auch die Beschichtung der Poreninnenraums des Filtermaterials erreicht werden, so dass eine größere katalytisch wirksame Oberfläche erzielt wird.The proposal according to the invention is particularly advantageous according to claim 5 after the dispersion contains nanoscale ceramic particles. With such Small ceramic particles can also coat the pore interior of the filter material can be achieved, so that a larger catalytically effective surface is achieved.

Das Aufsprühverfahren erfolgt vorzugsweise im Durchlaufverfahren der mattenförmigen Filtervorrichtungen unter entsprechenden Sprühdüsen, die ein- oder beidseitig die Dispersionen aufsprühen.The spraying process is preferably carried out in Continuous process of the mat-shaped Filter devices under appropriate spray nozzles, one or both sides spray on the dispersions.

In einem weiteren Aufsprühvorgang kann zusätzlich noch ein aus Metall oder Metalloxid bestehender Katalysator aufgebracht werden.In another spraying process can additionally another catalyst made of metal or metal oxide is applied become.

Es ist zweckmäßig, mit Sintermetallen beschichtetes flächiges Filtermaterial vor der Aufsprühung mit einer Dispersion einem Verfahren zur Erhöhung der Oberflächenrauhigkeit zu unterziehen, beispielsweise kann die Erhöhung der Oberflächenrauhigkeit durch Anätzen erfolgen. Dies dient der besseren Anhaftung der Dispersion.It is useful to be coated with sintered metals flat Filter material before spraying with a dispersion a method to increase the surface roughness to undergo, for example, the increase in surface roughness by etching respectively. This serves for better adhesion of the dispersion.

Es besteht auch die Möglichkeit einen Binder oder Kleber in einem vorhergehenden separaten Durchgang aufzusprühen.There is also the possibility a binder or glue in a previous separate pass spray.

Die aufgebrachte katalytische Sprühbeschichtung kann die Funktionen Rußzündsenkung, Oxidation von HC und CO, NO2-Erzeugung, SCR und NOx-Speicherung erfüllen.The applied catalytic spray coating can perform the functions soot ignition reduction, oxidation of HC and CO, NO 2 generation, SCR and NO x storage.

Die Aufbringung von unterschiedlichen Beschichtungen auf Vorder- und Rückseite einer Filterfolie kann für verschiedene Aufgaben der Abgasnachbehandlung von Vorteil sein.The application of different Coatings on the front and back a filter film can be used for Different exhaust aftertreatment tasks can be beneficial.

Claims (8)

Verfahren zum ein- oder beidseitigen Beschichten von flächigem Filtermaterial mit einer Dispersion aus katalytisch aktiven Komponenten und einem geeigneten Lösungsmittel, dadurch gekennzeichnet, dass auf die Filterfolien zur Herstellung von Partikelfiltern für Brennkraftmaschinen, insbesondere Dieselmotoren die Dispersion aufgesprüht wird.Method for coating flat filter material on one or both sides with a dispersion of catalytically active components and a suitable solvent, characterized in that the dispersion is sprayed onto the filter foils for the production of particle filters for internal combustion engines, in particular diesel engines. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Aufsprühung in einem oder mehreren Durchgängen erfolgt.A method according to claim 1, characterized in that spraying in one or more runs he follows. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während der einseitigen Besprühung von der Gegenseite der Filterfolie her ein Luftgegendruck aufrechterhalten wird zur Einstellung der Eindringtiefe der Dispersion.A method according to claim 1, characterized in that while the one-sided spraying of maintain an air back pressure on the opposite side of the filter foil is used to set the penetration depth of the dispersion. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Aufsprühen in einem Durchlaufverfahren erfolgt, bei dem vorzugsweise die Filterfolie im Endlosverfahren unter entsprechenden Sprühdüsen hindurchgeführt wird.A method according to claim 1, characterized in that spraying is carried out in a continuous process in which the filter film is preferably used is passed under the corresponding spray nozzles in an endless process. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass die Dispersion nanoskalierten Keramikteilchen enthält.Method according to one or more of the preceding Expectations, characterized in that the dispersion contains nanoscale ceramic particles. Verfahren nach einem oder mehreren der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass zusätzlich in einem weiteren Aufsprühvorgang ein aus Metallen oder Metalloxid bestehender Katalysator aufgebracht wird.Method according to one or more of the preceding Expectations, characterized in that additionally in a further spraying process catalyst made of metals or metal oxide applied becomes. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mit Sintermetall beschichtete Filterfolien vor der Aufsprühung einem Verfahren zur Erhöhung der Oberflächenrauhigkeit unterworfen wird.A method according to claim 1, characterized in filter films coated with sintered metal before spraying Procedure for raising the surface roughness is subjected. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Erhöhung der Oberflächenrauhigkeit z. B. durch Anätzen oder durch Oxidation erfolgt.A method according to claim 7, characterized in that the increase the surface roughness z. B. by etching or by oxidation.
DE10258693A 2002-12-16 2002-12-16 Process for coating one or both sides of flat filter material with a dispersion of catalytically active components and a suitable solvent Expired - Fee Related DE10258693B4 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009018422A1 (en) * 2009-04-22 2010-11-04 Emitec Gesellschaft Für Emissionstechnologie Mbh Process for producing a coated honeycomb body

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547597A1 (en) * 1995-12-20 1997-07-17 Degussa Monolithic catalyst for post treating IC engine exhaust gas
DE10115328A1 (en) * 2001-03-28 2002-10-10 Framatome Anp Gmbh Method for ultrasonic measurement of partial layer thicknesses of thin-walled pipes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19547597A1 (en) * 1995-12-20 1997-07-17 Degussa Monolithic catalyst for post treating IC engine exhaust gas
DE10115328A1 (en) * 2001-03-28 2002-10-10 Framatome Anp Gmbh Method for ultrasonic measurement of partial layer thicknesses of thin-walled pipes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009018422A1 (en) * 2009-04-22 2010-11-04 Emitec Gesellschaft Für Emissionstechnologie Mbh Process for producing a coated honeycomb body
US8444741B2 (en) 2009-04-22 2013-05-21 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Coated honeycomb body and method for producing a coated honeycomb body

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Owner name: HJS EMISSION TECHNOLOGY GMBH & CO. KG, 58706 M, DE

R081 Change of applicant/patentee

Owner name: HJS EMISSION TECHNOLOGY GMBH & CO. KG, DE

Free format text: FORMER OWNER: HJS FAHRZEUGTECHNIK GMBH & CO., 58706 MENDEN, DE

Effective date: 20110201

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee