EP0254818A2 - Matériau support pour catalyseurs - Google Patents

Matériau support pour catalyseurs Download PDF

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Publication number
EP0254818A2
EP0254818A2 EP87106133A EP87106133A EP0254818A2 EP 0254818 A2 EP0254818 A2 EP 0254818A2 EP 87106133 A EP87106133 A EP 87106133A EP 87106133 A EP87106133 A EP 87106133A EP 0254818 A2 EP0254818 A2 EP 0254818A2
Authority
EP
European Patent Office
Prior art keywords
coating
metal powder
carrier
semi
finished product
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.)
Pending
Application number
EP87106133A
Other languages
German (de)
English (en)
Other versions
EP0254818A3 (fr
Inventor
Helmut Dr.-Ing. Brandis
Günter Dr.-Ing. Lehnert
Peter Dr.-Ing. Schüler
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.)
Thyssen Stahl AG
Original Assignee
Thyssen Edelstahlwerke AG
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 Thyssen Edelstahlwerke AG filed Critical Thyssen Edelstahlwerke AG
Publication of EP0254818A2 publication Critical patent/EP0254818A2/fr
Publication of EP0254818A3 publication Critical patent/EP0254818A3/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy

Definitions

  • the invention relates to a semi-finished product for the production of catalysts, consisting of a metallic support and a coating of the support on the surface thereof, and a method for producing the same.
  • Catalysts are used, among other things, for the oxidation of incompletely burned exhaust gas components and for the reduction of nitrogen oxides in exhaust gases by separating catalytically active components on a phase deposited on a support material with the largest possible active surface.
  • Platinum metals for example, are used as the catalytically active component.
  • the large surface area required to accommodate the catalytically active components is produced according to the prior art by applying metal oxide, for example in the form of Gemma-Al2O3 (DE-OS 32 23 500). It is also known To produce oxide whiskers on flat metal carrier foils (GB-PS 2 063 723), which form an enlarged surface for anchoring an oxidic intermediate layer on which the catalytically active component is deposited.
  • the known methods require a relatively high outlay.
  • the cultivation of the whiskers requires special measures during the pouring for rapid solidification in order to germinate sterling crystals, and furthermore a subsequent annealing in order to let the stems grow.
  • These processes also require appropriate materials, such as Fe-Al-Cr alloys, on the surface of which stem crystals can be produced.
  • the invention has for its object to provide a semi-finished product in flat or profiled form for the production of catalysts, which is constructed in a simple manner and has the largest possible surface for the further adhering layer and is inexpensive to manufacture as a mass product.
  • the macroscopic pores are produced in such a way that an evaporable substance in powder form is admixed to the metal powder, which after application of the metal powder mixture in solid form or as a slurry on the surface of the carrier and heating to sintering temperature to connect the metal powder particles evaporated with each other and with the carrier without residue. Then the coating shows micro- and macroscopic pores.
  • a temporary binder can also be added to the metal powder.
  • metal powder particles contain aluminum or if the coating is alitated, aluminum oxide whiskers can be produced by an oxidizing annealing treatment.
  • the coating in a preferred embodiment of the invention consists of FeAl, then iron oxide platelets and aluminum oxide whiskers can be produced by an oxidizing annealing, which ensure a considerable increase in the surface of the coating.
  • the invention also encompasses a simple method for producing a metallic support with a coating for anchoring a reactive oxide layer or the catalytically active material.
  • This method consists in mixing metal powder with a substance which evaporates without residue at elevated temperature in powder form, coating the metallic carrier with this mixture, preferably in the form of an alcoholic slurry, optionally after adding an adhesive, and then heating the coated carrier to sintering temperature .
  • Any suitable commercially available material such as synthetic resin, shellac or the like, can be used as the adhesive.
  • the advantage of the invention lies firstly in the substantially improved adhesion of the porous metal layer to the support, then in the formation of a substantially enlarged surface of the coating on which the catalytically active component can be optimally attached.
  • the carrier can also be easily coat the metal powder by applying a slurry, immediately drying it and subsequent sintering and, if appropriate, subsequent oxide annealing and addition of the catalytically active material. These successive process steps can practically be carried out during a single belt run.
  • a metal foil as a carrier for producing a structurally reinforced honeycomb-shaped catalyst body consists of an Fe-20Cr-5Al alloy.
  • the carrier is provided with a slurry consisting of 56% by mass FeAl, 37% by mass saturated alcoholic shellac solution and 7% by mass of a vaporizable polyacrylic resin.
  • the FeAl powder used consists of approx. 50% Fe and 50% Al and is present in a grain size distribution between 36 and 45 ⁇ m.
  • the shellac solution serves as a binder during application.
  • the polyacrylic resin is added in the form of fine powder.
  • the alcoholic component evaporates in air in a short time after the slurry has been applied to the metal support. Then metal carrier and plating layer are heated to 950 ° C in a reducing protective gas atmosphere, for example H2, and held there for about 15 minutes. Both shellac and polyacrylic resin escape during heating at about 8 ° C / min Temperatures below 650 ° C gaseous from the coating without leaving any residue. Outgassing the polyacrylic resin creates macroscopic pores of uniform distribution in the layer, in addition to the finer voids between the metal powder particles (Fig. 1). By further heating to 950 ° C and holding at this temperature, the metal powder particles sinter against each other and on the carrier.
  • a reducing protective gas atmosphere for example H2
  • the entire process can also be carried out by dip coating on the finished structural body. If the metal carrier foil is to be e.g. are coated on the belt, the shaping of the coated carrier film is expediently carried out after drying the slurry in air.
  • the metallic coating layer interspersed with macro and micro pores can be directly coated with e.g. Platinum metal deposits are provided.
  • it can also be subjected to a whisker annealing to further enlarge the surface, e.g. at 900 ° C for 1 min in dry CO2 and 925 ° C for 16 h in air.
  • the porous metal layer can be enriched with Al on the diffusion path (e.g. CVD process).
  • porous metal layer can also be used to hold a reactive oxide layer in order to decisively improve its adhesion to the carrier material.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Manufacturing & Machinery (AREA)
  • Catalysts (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP87106133A 1986-07-26 1987-04-28 Matériau support pour catalyseurs Pending EP0254818A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863625330 DE3625330A1 (de) 1986-07-26 1986-07-26 Traegermaterial fuer katalysatoren
DE3625330 1987-07-26

Publications (2)

Publication Number Publication Date
EP0254818A2 true EP0254818A2 (fr) 1988-02-03
EP0254818A3 EP0254818A3 (fr) 1989-11-29

Family

ID=6306046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87106133A Pending EP0254818A3 (fr) 1986-07-26 1987-04-28 Matériau support pour catalyseurs

Country Status (4)

Country Link
US (1) US4783436A (fr)
EP (1) EP0254818A3 (fr)
JP (1) JPS6339638A (fr)
DE (1) DE3625330A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5874153A (en) * 1994-02-04 1999-02-23 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Zeolite-coatable metallic foil process for producing the metallic foil
CN1081489C (zh) * 1994-02-04 2002-03-27 发射技术有限公司 可用沸石涂层的金属箔

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5055442A (en) * 1989-02-17 1991-10-08 Nippon Shokubai Kagaku Kogyo Co., Ltd. Carrier for catalyst and method for production thereof
US5206202A (en) * 1991-07-25 1993-04-27 Corning Incorporated Catalyst device fabricated in situ and method of fabricating the device
US5326138A (en) * 1992-10-16 1994-07-05 Hancor, Inc. High pressure coupling for plastic pipe and conduit
US5711071A (en) * 1995-11-08 1998-01-27 Howard A. Fromson Catalytic structures and method of manufacture
RU2514382C1 (ru) * 2012-10-09 2014-04-27 Гребнев Вениамин Владимирович Способ изготовления рений- и рутенийсодержащих каталитических нейтрализаторов двигателей внутреннего сгорания (двс)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2063723A (en) 1979-11-28 1981-06-10 Gen Motors Corp Oxide-whisker coated foil and method of preparation thereof
DE3223500A1 (de) 1982-06-24 1983-12-29 Degussa Ag, 6000 Frankfurt Katalysator zur reinigung der abgase von verbrennungskraftmaschinen, verfahren zur herstellung des katalysators und verwendung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873472A (en) * 1972-10-28 1975-03-25 Kanegafuchi Chemical Ind Catalyst for the purification of exhaust gases and process for preparing the catalyst
US3928235A (en) * 1973-11-12 1975-12-23 Paul Douglas Goodell Catalyst for purification of waste streams
DE2534113A1 (de) * 1975-07-30 1977-02-17 American Hospital Supply Corp Verfahren zum auftragen eines poroesen metallueberzuges auf ein metallsubstrat und nach diesem verfahren behandeltes metallsubstrat
JPS5224996A (en) * 1975-08-21 1977-02-24 Kyushu Refract Co Ltd Process for producing catalist for the reduction of nitrogen oxides
DE2745188C3 (de) * 1977-10-07 1980-05-08 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Geformter Katalysator, Verfahren zu seiner Herstellung und Verwendung
US4318828A (en) * 1980-08-15 1982-03-09 General Motors Corporation Enhanced oxide whisker growth on cold-rolled aluminum-containing stainless steel foil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2063723A (en) 1979-11-28 1981-06-10 Gen Motors Corp Oxide-whisker coated foil and method of preparation thereof
DE3223500A1 (de) 1982-06-24 1983-12-29 Degussa Ag, 6000 Frankfurt Katalysator zur reinigung der abgase von verbrennungskraftmaschinen, verfahren zur herstellung des katalysators und verwendung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5874153A (en) * 1994-02-04 1999-02-23 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Zeolite-coatable metallic foil process for producing the metallic foil
CN1081489C (zh) * 1994-02-04 2002-03-27 发射技术有限公司 可用沸石涂层的金属箔

Also Published As

Publication number Publication date
DE3625330C2 (fr) 1988-08-18
JPS6339638A (ja) 1988-02-20
EP0254818A3 (fr) 1989-11-29
US4783436A (en) 1988-11-08
DE3625330A1 (de) 1988-02-04

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