公开(公告)号：CA2299602A1

公开(公告)日：2000-08-26

申请号：CA2299602

申请日：2000-02-25

Applicant: DEGUSSA

Inventor： MUSSMANN LOTHAR ,  LOX EGBERT ,  KREUZER THOMAS ,  DOMESLE RAINER ,  GOBEL ULRICH

IPC: B01D53/94 ,  B01J23/00 ,  B01J23/54 ,  B01J23/58 ,  B01J23/63 ,  B01J35/04 ,  B01J35/10 ,  B01J37/02 ,  B01J37/025 ,  B01J23/40

Abstract: The present invention provides a powdered catalyst material based on aluminium oxide, which contains at least one basic metal oxide and at least one noble metal from the platinum group of the Periodic System of Elements in addition to aluminium oxide. The catalyst material is obtainable by loading a support material already stabilised by basic oxides by renewed impregnation with further basic oxides. After drying and calcining this post-impregnated material at temperatures below 800.degree.C, the catalytically active noble metals are also incorporated into the support material by impregnation.

公开(公告)号：BR9901346A

公开(公告)日：2000-04-18

申请号：BR9901346

申请日：1999-03-29

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  GOEBEL ULRICH ,  LOX EGBERT ,  MUELLER WILFRIED ,  DOMESLE RAINER

IPC: B01D53/86 ,  B01D53/94 ,  B01J21/16 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02D41/02 ,  F02D41/14

Abstract: An internal combustion engine (2) exhaust gas purification device (1) is operated predominantly using lean air-fuel ratios. It has a sulfur filter (5) followed by a NOx storage catalyzer (6). Process for operating an internal combustion engine exhaust gas purification device comprises:- (a) storing the nitrogen oxides in the exhaust gas on a storage catalyst and the sulfur oxides on the sulfur trap at air factors of above 1 and exhaust gas temperatures TK within the activity window DELTA TNOX, in which the exhaust gas temperature TS is smaller than the desulfurization temperature TS DeSOx, and cyclically reducing the air factor of the exhaust gas below 1 to release the stored nitrogen oxides; and (b) desulfurizing the sulfur trap by increasing the exhaust gas temperature TS above the desulfurization temperature of the sulfur trap and reducing the air factor of the exhaust gas below 1 and cyclically repeating steps (a) and (b).

公开(公告)号：CA2285825A1

公开(公告)日：2000-04-13

申请号：CA2285825

申请日：1999-10-12

Applicant: DEGUSSA

Inventor： DOMESLE RAINER ,  STREHLAU WOLFGANG ,  GOEBEL ULRICH

IPC: B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J27/053 ,  B01J27/055 ,  B01J20/04 ,  B01J23/12 ,  B01J23/42 ,  B01D53/56

Abstract: The invention relates to a nitrogen oxide storage catalyst which contains at least one catalyst material and at least one nitrogen oxide storage component from the group of alkali and alkaline earth metals. The nitrogen oxide storage catalyst is characterised in that the nitrogen oxide storage component, after completing catalyst preparation, is present as finely divided barium sulfate, strontium sulfate or as a mixture or mixed crystals of the two sulfates or as their complete or incomplete decomposition product with an average particle size of less than 1 .mu.m. Barium sulfate and/or strontium sulfate act as feed materials for the active storage component barium oxide in the storage catalyst according to the invention. As a result of the reductive exhaust gas compositions occurring under normal driving conditions barium sulfate and strontium sulfate decompose to compounds which are able to store nitrogen oxides. This more or less compensates for the loss of active storage components which occurs due to ageing. There is also the possibility of decomposing barium sulfate and/or strontium sulfate during production by means of reductive calcination in order to obtain a high initial loading of the catalyst with storage compounds. In this case the sulfates mentioned are used as auxiliary agents in order to introduce the highest possible concentrations of storage compounds into the storage catalyst.

公开(公告)号：AU2249899A

公开(公告)日：1999-10-07

申请号：AU2249899

申请日：1999-03-29

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  DOMESLE RAINER ,  MULLER WILFRIED ,  LOX EGBERT ,  GOBEL ULRICH

IPC: B01D53/86 ,  B01D53/94 ,  B01J21/16 ,  F01N3/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/24 ,  F01N3/28 ,  F01N9/00 ,  F01N13/02 ,  F02D41/02 ,  F02D41/14

Abstract: An internal combustion engine (2) exhaust gas purification device (1) is operated predominantly using lean air-fuel ratios. It has a sulfur filter (5) followed by a NOx storage catalyzer (6). Process for operating an internal combustion engine exhaust gas purification device comprises:- (a) storing the nitrogen oxides in the exhaust gas on a storage catalyst and the sulfur oxides on the sulfur trap at air factors of above 1 and exhaust gas temperatures TK within the activity window DELTA TNOX, in which the exhaust gas temperature TS is smaller than the desulfurization temperature TS DeSOx, and cyclically reducing the air factor of the exhaust gas below 1 to release the stored nitrogen oxides; and (b) desulfurizing the sulfur trap by increasing the exhaust gas temperature TS above the desulfurization temperature of the sulfur trap and reducing the air factor of the exhaust gas below 1 and cyclically repeating steps (a) and (b).

公开(公告)号：CA2037086C

公开(公告)日：1997-09-30

申请号：CA2037086

申请日：1991-02-26

Applicant: DEGUSSA

Inventor： MERGNER BERND ,  DOMESLE RAINER ,  SCHMIDT FELIX

IPC: B01J23/63 ,  B01J23/56 ,  B01J33/00 ,  B01J37/00 ,  B01J37/02

Abstract: Monolithic catalysts are improved in their thermal shock resistance if, before application of the catalyst components, the ceramic monolithic support is precoated with a fusible and burnable organic filler from a dispersion in very fine solid particles. The support is heated beyond the melting point of the filler, the catalyst components are subsequently applied and the filler is then burnt off.

公开(公告)号：BR9503249A

公开(公告)日：1997-09-30

申请号：BR9503249

申请日：1995-07-07

Applicant: DEGUSSA

Inventor： DOMESLE RAINER ,  ENGLER BERND ,  KUHL WOLFGANG ,  LOX EGBERT ,  FEHNLE OLIVER ,  LEIBOLD WALTER

IPC: B01J35/04 ,  B01J37/00 ,  B01J37/08 ,  F01N3/28 ,  B01D53/86 ,  B01D53/94

Abstract: A cylindrical catalyst honeycomb body is bordered by two end surfaces forming the inlet and outlet surfaces, and a surrounding shell surface is formed by introducing a ceramic mass into the channels. The ceramic mass is introduced by at least one nozzle to the channel, where the nozzle and honeycomb body are moved relative to one another with simultaneous guiding of the nozzle on the shell surface and/or the end surface contour.

公开(公告)号：CA2036006C

公开(公告)日：1997-05-20

申请号：CA2036006

申请日：1991-02-08

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 ,  B01J23/10

Abstract: A catalyst for the purification of the exhaust gases of internal combustion engines with improved cold start performance and improved lean long-term endurance combined with reduced specific noble metal charge is proposed. It uses active aluminium oxide with conventional promoters as carrier and platinum and/or palladium and rhodium in the usual quantities as noble metals, In addition it contains one or more base metals in quantities of up to 5 times the total mass of noble metal, which base metals are brought into immediate vicinity of rhodium by a special manufacturing technique.

公开(公告)号：CA2009029C

公开(公告)日：1996-04-16

申请号：CA2009029

申请日：1990-01-31

Applicant: DEGUSSA

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

IPC: F01N3/28 ,  B01D53/94 ,  B01J23/10 ,  B01J23/54 ,  B01J23/56 ,  B01J23/63 ,  B01J23/89 ,  B01J32/00 ,  B01J23/40

Abstract: Support material for three-way catalysts containing platinum group metal and having reduced tendency for H2S emission and in particular a support material for catalysts containing platinum group metal for purification of car exhaust gas, the catalysts having reduced tendency for H2S emission. The support material consists of an annealed, spray-dried cerium oxide or a combination thereof with aluminum oxide.

公开(公告)号：FI95667C

公开(公告)日：1996-03-11

申请号：FI884978

申请日：1988-10-28

Applicant: DEGUSSA

Inventor： KOBERSTEIN EDGAR ,  ENGLER BERND ,  DOMESLE RAINER ,  VOELKER HERBERT

IPC: B01D53/94 ,  B01J23/56 ,  B01J23/58 ,  B01J23/63 ,  B01J23/89 ,  F02B1/04

公开(公告)号：NO178721B

公开(公告)日：1996-02-12

申请号：NO884815

申请日：1988-10-28

Applicant: DEGUSSA

Inventor： KOBERSTEIN EDGAR ,  ENGLER BERND ,  DOMESLE RAINER ,  VOLKER HERBERT

IPC: B01D53/94 ,  B01J23/56 ,  B01J23/58 ,  B01J23/63 ,  B01J23/89 ,  B01J37/02 ,  B01D53/86

Abstract: The invention is a three-way catalyst of active aluminum oxide, palladium, rhodium and cerium dioxide. If Al2O3 is present as bulk carrier, the catalyst contains 5-20% by weight CeO2 and if Al2O3 is present as a coating on a honeycombed, inert carrier, it contains 25-50% by weight CeO2.