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    CATALYST FOR PURIFYING EXHAUST GASES OF DIESEL ENGINES BY MEANS OF OXIDATION
    91.
    发明专利
    CATALYST FOR PURIFYING EXHAUST GASES OF DIESEL ENGINES BY MEANS OF OXIDATION 未知

    公开(公告)号：HU9301170D0

    公开(公告)日：1993-08-30

    申请号：HU9301170

    申请日：1993-04-20

    Applicant: DEGUSSA

    Inventor： LEYRER JUERGEN ,  LOX EGBERT ,  ENGLER BERND ,  DOMESLE RAINER

    IPC: F01N3/10 ,  B01D53/94 ,  B01J23/64 ,  B01J23/648 ,  B01J29/04 ,  B01J35/04 ,  B01J37/00 ,  B01J37/02 ,  F02B3/06

    Abstract: The invention relates to a catalyst for the oxidative purification of exhaust gases of diesel engines with a high conversion efficiency for hydrocarbons and carbon monoxide and an inhibited oxidation effect with respect to nitrogen oxides and sulphur dioxide, containing a monolithic catalyst body which has ducts of ceramic or metal, through which free flow is possible, and is coated with an activity-promoting dispersion coating consisting of the finely particulate metal oxides aluminium oxide, titanium oxide, silicon oxide, zeolite or mixtures thereof as a support for the catalytically active components, the active components being present as platinum metals platinum, palladium, rhodium and/or iridium, which are doped with vanadium or are in contact with an oxidic vanadium compound. The reduced oxidation effect with respect to sulphur dioxide is achieved by the finely particulate metal oxides being surface-modified aluminium oxide, titanium oxide, silicon oxide, zeolite or mixtures thereof. The surface modification consists in the specific surface of the metal oxides being coated with a layer consisting of titanium dioxide or silicon dioxide and comprising from 1 to 5 monolayers.

    95.
    发明专利
    未知

    公开(公告)号：BR9100510A

    公开(公告)日：1991-10-29

    申请号：BR9100510

    申请日：1991-02-07

    Applicant: DEGUSSA

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

    IPC: B01J23/40 ,  B01D53/86 ,  B01D53/94 ,  B01J23/56 ,  B01J23/58 ,  B01J23/63 ,  B01J23/89 ,  B01J37/02 ,  F01N3/18 ,  F02B1/04 ,  F01N3/28

    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.

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