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    Noble metal alumina catalyst contg. oxide promoter for gas purificn. - doped with base metal for cold start property and resistance to lean gas
    41.
    发明专利
    Noble metal alumina catalyst contg. oxide promoter for gas purificn. - doped with base metal for cold start property and resistance to lean gas 未知

    公开(公告)号：DE4003939A1

    公开(公告)日：1991-08-14

    申请号：DE4003939

    申请日：1990-02-09

    Applicant: DEGUSSA

    Inventor： DOMESLE RAINER DR ,  ENGLER BERND DR ,  SCHMIDT FELIX DR ,  SCHUBERT PETER DR ,  KOBERSTEIN EDGAR DR

    IPC: B01J23/40 ,  B01D53/86 ,  B01D53/94 ,  B01J23/56 ,  B01J23/58 ,  B01J23/63 ,  B01J23/89 ,  B01J37/02 ,  F01N3/18 ,  F02B1/04

    Abstract: Catalyst for purifying i.c. engine exhaust gas has an Al2O3 support of the transition series, which contains 3-70 (wt.)% CeO2, 0-20% La2O3, opt. mixed with other rare earth metal oxides, 1-20% ZrO2, 0-10% Fe2O3 and 0-20% NiO as promoter, and has an active phase of 0.02-3% Pt and/or Pd and Rh, with a ratio of Pt and/or Pd and Rh of 1:2 to 15:1, pref. 1:1 to 3:1 and opt. a wt. ratio of Pt and Pd of 10:1 to 1:5. The opt. lattice-stabilised support is impregnated with a soln. of a promoter cpd. and/or mixed with a suspension of oxides, hydroxides or carbonates of the promoter elements and heated in air at 300-900 deg.C, then impregnated with a soln. of the noble metal cpds.,dried and opt. activated in a gas contg. H2, opt. under hydrothermal conditions, at 250-1050 deg.C. The catalyst contains base metal(s), i.e. Li, K, Rb, Mg, Ca, Ba, La, Ce, Pr, Nd, Sm, Fe, Co and/or Ni, in an amt. up to 5 times the total amt. of noble metal; and is prepd. by impregnating the support contg. promoter with a soln. (A) of Pt and/or Pd cpd(s). corresp. to at least 30% of the total amt. of Pt and/or Pd, drying and activation, then impregnating with a soln. (B) contg. Rh cpd. opt. the rest of the Pt and/or Pd cpd. and base metal cpd(s)., followed by drying and activation.

    A PROCESS FOR PREPARING A CATALYST
    45.
    发明专利
    A PROCESS FOR PREPARING A CATALYST 未知

    公开(公告)号：MY133077A

    公开(公告)日：2007-10-31

    申请号：MYPI9805462

    申请日：1998-12-02

    Applicant: DEGUSSA

    Inventor： KLEIN HARALD DR ,  LEYRER JURGEN DR ,  DOMESLE RAINER DR ,  LOX EGBERT DR ,  KREUZER THOMAS DR

    IPC: B01J31/16 ,  B01J37/02 ,  B01J23/40 ,  B01J31/28

    Abstract: THE INVENTION RELATES TO A PROCESS FOR PREPARING A CATALYST WHICH HAS A CATALYTICALLY ACTIVE COATING OF HIGH SURFACE AREA FINELY DIVIDED MATERIALS AND CATALYTICALLY ACTIVE COMPONENTS ON AN INERT SUPPORT STRUCTURE. A POWDER MIXTURE OF THE FINELY DIVIDED MATERIALS USED IS IMPREGNATED WITH A SOLUTION OF PRECURSOR COMPOUNDS OF THE CATALYTICALLY ACTIVE COMPONENTS. BY SUITABLE COMBINATION OF THE FINELY DIVIDED MATERIALS AND THE PRECURSOR COMPOUNDS AND APPROPRIATE MANAGEMENT OF THE IMPRENATION PROCESS, A HIGHLY DISPERSED DEPOSITION AND ADSORPTION OF THE CATALYTICALLY ACTIVE COMPONENTS IS ENSURED ON THE FINELY DIVIDED MATERIALS. THEN AN AQUEOUS COATING DISPERSION IS PRODUCED USING THE IMPREGNATED POWDER MIXTURE AND THE SUPPORT STRUCTURE IS COATED THEREWITH. THE COATING IS THEN DRIED AND CALCINED.

    PROCESS FOR PREPARING A CATALYST
    49.
    发明专利
    PROCESS FOR PREPARING A CATALYST 未知

    公开(公告)号：CZ397098A3

    公开(公告)日：1999-06-16

    申请号：CZ397098

    申请日：1998-12-03

    Applicant: DEGUSSA

    Inventor： KLEIN HARALD DR ,  LEYRER JURGEN DR ,  DOMESLE RAINER DR ,  LOX EGBERT DR ,  KREUZER THOMAS DR

    IPC: B01J31/16 ,  B01J23/40 ,  B01J37/02

    Abstract: The coated catalyst is made by impregnating powdered finely divided carrier material with a solution of catalyst precursor, making an aqueous dispersion of impregnated material, coating an inert support with the dispersion, drying and calcining. Production of the coated catalyst comprises: (a) impregnating powdered finely divided materials of large surface area with a solution of catalyst precursors by the method of pore volume impregnation so that the precursors are adsorbed on the material(s); (b) making an aqueous coating dispersion from the mixture; (c) coating an inert support with the dispersion; and (d) drying and calcining the coating.

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