公开(公告)号：JPH067677A

公开(公告)日：1994-01-18

申请号：JP9283093

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 ,  B01D53/36

Abstract: PURPOSE: To obtain a catalyst having a high conversion rate for hydrocarbons and carbon monoxide by using doped platinum, etc., as an active component in a monolithic catalyst element with throughflow passages of ceramic etc., coated with an activity-promoting dispersion coating. CONSTITUTION: A fine particulate metal oxide is surface-modified Al oxide, titanium oxide, silicon oxide, zeolite or a mixture thereof which is obtained by mixing the fine particulate metal oxide or the mixture thereof into an alcoholic soln. of a precursor for titanium oxide and/or silicon oxide with stirring, removing the alcoholic solvent with stirring continuously, drying the residual solid at a elevated temp., and after pulverization, calcining titanium dioxide or silicon dioxide at 300-600 deg.C for 0.5-4 hours while decomposing the precursor for titanium oxide and/or silicon oxide. Platinum, Pd, Rh and/or Ir doped with V is (are), included as (an) active component(s) on the carrier.

公开(公告)号：ZA9811073B

公开(公告)日：1999-06-07

申请号：ZA9811073

申请日：1998-12-03

Applicant: DEGUSSA

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

IPC: B01J31/16 ,  B01J23/40 ,  B01J37/02 ,  B01J

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.

公开(公告)号：CA2202417A1

公开(公告)日：1997-10-12

申请号：CA2202417

申请日：1997-04-11

Applicant: DEGUSSA

Inventor： DOMESLE RAINER ,  LINDNER DIETER ,  KREUZER THOMAS ,  LOX EGBERT ,  MUELLER WILFRIED ,  LEYRER JUERGEN

IPC: B01D53/86 ,  B01D53/94 ,  B01J21/12 ,  B01J29/03 ,  B01J29/06 ,  B01J29/068 ,  B01J29/08 ,  B01J29/12 ,  B01J29/40 ,  B01J29/44 ,  B01J29/80

Abstract: The invention relates to a catalyst for purifying the exhaust gases from diesel engines. The catalyst contains a zeolite mixture of several zeolites with different moduli and platinum group metals as well as further metal oxides from the group comprising aluminium silicate, aluminium oxide and titanium oxide, wherein the aluminium silicate has a ratio by weight of silicon dioxide to aluminium oxide of 0.005 to 1 and the platinum group metals are deposited on only the further metal oxides.

公开(公告)号：AU655724B2

公开(公告)日：1995-01-05

申请号：AU3702693

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 ,  B01D53/36

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.

公开(公告)号：HUT66374A

公开(公告)日：1994-11-28

申请号：HU9300582

申请日：1993-03-03

Applicant: DEGUSSA

Inventor： ENGLER BERND ,  LOX EGBERT ,  LEYRER JUERGEN

IPC: B01D53/56 ,  B01D53/86 ,  B01D53/94 ,  B01J29/06 ,  B01J29/24 ,  B01J35/04 ,  B01J37/02 ,  F02B1/04

Abstract: The invention relates to a catalyst for decreasing nitrogen oxide in the lean exhaust gas of automobile engines. On a structurally reinforcing body, it contains a first catalytic coating of a high surface area aluminium oxide and/or cerium oxide impregnated with a mixture of iridium and platinum as catalytically active noble metal components. On the first layer is applied a second catalytic coating of a zeolite which contains copper and/or iron and is of the mordenite type.

公开(公告)号：CZ379892A3

公开(公告)日：1993-12-15

申请号：CS379892

申请日：1992-12-21

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 ,  B01D53/36

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.

公开(公告)号：ZA9302806B

公开(公告)日：1993-11-16

申请号：ZA9302806

申请日：1993-04-21

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 ,  B01J ,  B01D ,  F01N

CPC classification number: B01J23/6482 ,  B01D53/944 ,  B01J35/04 ,  B01J37/0027 ,  B01J37/0236 ,  B01J37/0248 ,  F02B3/06 ,  Y02A50/2341

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.

公开(公告)号：BR9903053A

公开(公告)日：2000-05-09

申请号：BR9903053

申请日：1999-07-02

Applicant: DEGUSSA

Inventor： TILLAART HANS VAN DEN ,  LEYRER JUERGEN ,  STREHLAU WOLFGANG ,  LOX EGBERT ,  KREUZER THOMAS ,  PLOG CARSTEN ,  ANDORF RENATO ,  MARKERT NORBERT ,  STENGEL THOMAS

IPC: B01D53/94 ,  B01J23/46 ,  B01J29/068 ,  B01J29/44 ,  B01J103/76

Abstract: The catalyst for reducing nitrogen oxides in an oxidizing and reducing atmosphere contains iridium on a support material made of silicon dioxide or zeolite. The iridium on the outer surface has an average particle size of 5-30 nm. An Independent claim is also included for the production of the catalyst comprising impregnating the support material with a soluble precursor of iridium, drying the impregnated material and calcining in a gas stream containing hydrogen at 300-500 degrees C for 1-10 hours.

公开(公告)号：DE19930494A1

公开(公告)日：2000-02-03

申请号：DE19930494

申请日：1999-07-01

Applicant: DEGUSSA ,  DAIMLER CHRYSLER AG

Inventor： TILLAART HANS VAN DEN ,  LEYRER JUERGEN ,  STREHLAU WOLFGANG ,  LOX EGBERT ,  KREUZER THOMAS ,  PLOG CARSTEN ,  ANDORF RENATO ,  MARKERT NORBERT ,  STENGEL THOMAS

IPC: B01D53/94 ,  B01J23/46 ,  B01J29/068 ,  B01J29/44 ,  F01N3/20

Abstract: The catalyst for reducing nitrogen oxides in an oxidizing and reducing atmosphere contains iridium on a support material made of silicon dioxide or zeolite. The iridium on the outer surface has an average particle size of 5-30 nm. An Independent claim is also included for the production of the catalyst comprising impregnating the support material with a soluble precursor of iridium, drying the impregnated material and calcining in a gas stream containing hydrogen at 300-500 deg C for 1-10 hours.

公开(公告)号：PL330064A1

公开(公告)日：1999-06-07

申请号：PL33006498

申请日：1998-12-03

Applicant: DEGUSSA

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

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.