公开(公告)号：AU747495B2

公开(公告)日：2002-05-16

申请号：AU2244099

申请日：1999-03-26

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  GOBEL ULRICH ,  DOMESLE RAINER ,  LOX EGBERT ,  KREUZER THOMAS

IPC: B01D53/34 ,  B01D53/50 ,  B01D53/81 ,  B01D53/86 ,  B01D53/94 ,  B01J20/04 ,  B01J20/08 ,  B01J23/42 ,  F01N3/08 ,  B01J23/02 ,  B01D53/04

Abstract: Storage material comprises magnesium oxide and aluminum oxide as a magnesium aluminate spinel in a mole ratio of 1.1:1. The magnesium oxide present in a stoichiometric excess is homogeneously dispersed in the storage material in a highly dispersed form. An Independent claim is also included for the production of the storage material comprising calcining a magnesium/aluminum hydrotalcite having a magnesium oxide/aluminum oxide mole ratio of 1.1:1 at a temperature of 400-600o C for 1-10 hours.

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：PL335960A1

公开(公告)日：2000-04-25

申请号：PL33596099

申请日：1999-10-12

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  GOEBEL ULRICH ,  DOMESLE RAINER

IPC: B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J27/053 ,  B01J27/055

Abstract: Nitrogen oxide-storage catalyst contains at least one fine particled catalyst material and nitrogen oxide-storage component. The nitrogen oxide-storage has an average particle diameter of less than 1 micrometer after the completion of catalyst production as fine particles of barium sulfate, strontium sulfate or as mixture thereof or as completed or incomplete decomposition product. Independent claims are included for: (a) nitrogen oxide-storage catalyst in the form of a coating on the walls of the flow canals of an inert honeycombed body containing fine particled catalyst material and a nitrogen oxide-storage component and (b) a method of producing nitrogen oxide-storage catalyst.

公开(公告)号：DE19847008A1

公开(公告)日：2000-04-20

申请号：DE19847008

申请日：1998-10-13

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  GOEBEL ULRICH ,  DOMESLE RAINER

IPC: B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J27/053 ,  B01J27/055

Abstract: Nitrogen oxide-storage catalyst contains at least one fine particled catalyst material and nitrogen oxide-storage component. The nitrogen oxide-storage has an average particle diameter of less than 1 micrometer after the completion of catalyst production as fine particles of barium sulfate, strontium sulfate or as mixture thereof or as completed or incomplete decomposition product. Independent claims are included for: (a) nitrogen oxide-storage catalyst in the form of a coating on the walls of the flow canals of an inert honeycombed body containing fine particled catalyst material and a nitrogen oxide-storage component and (b) a method of producing nitrogen oxide-storage catalyst.

公开(公告)号：AU4466799A

公开(公告)日：2000-03-09

申请号：AU4466799

申请日：1999-08-23

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  DOMESLE RAINER ,  MUSSMANN LOTHAR ,  GOBEL ULRICH

IPC: B01D53/86 ,  B01D53/94 ,  B01J20/04 ,  B01J20/30 ,  B01J23/02 ,  B01J23/10 ,  B01J23/58 ,  B01J23/63 ,  B01J35/02 ,  B01J37/03 ,  F01N3/08 ,  F02B1/04 ,  B01D53/56

Abstract: The carrier material is selected from a group doping/donating cerium oxide, cerium/zircon-mixed oxide, calcium titanate, strontium titanate, barium titanate, barium stannate, barium zirconate, magnesium oxide, lanthan oxide, praseodymium oxide, samarium oxide, neodymium oxide, yttrium oxide, yttrium barium cuprate, lead titanate, bismuth titanate, lanthan cobaltate, lanthan manganate and barium cuprate or a mixture. The particles of the storage components has particle diameter of at least 1.5 micronmeter. Nitrogen oxide-storage material comprises at least a storage component for nitrogen oxide in the form of particles of oxide(s), carbonate(s), or hydroxide(s) of earth metals magnesium calcium, strontium and barium as well as alkali metals potassium and caesium on a carrier material. Independent claims are include for the production of storage material and use of nitrogen oxide-storage.

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：DE19923781C2

公开(公告)日：2001-04-26

申请号：DE19923781

申请日：1999-05-22

Applicant: DEGUSSA

Inventor： SCHAEFER-SINDLINGER ADOLF ,  STREHLAU WOLFGANG ,  LOX EGBERT ,  KREUZER THOMAS ,  GOEBEL ULRICH

IPC: F01N3/02 ,  B01D46/42 ,  B01D53/94 ,  B01J35/04 ,  F01N3/023 ,  F01N3/035 ,  F01N3/18 ,  F01N3/24 ,  F01N3/28 ,  F01N13/02

Abstract: Process for removing carbon particulate from diesel engine exhaust gases by oxidation of nitrous oxide in the gases to nitro dioxide, separating the particulates and oxidizing them with the nitrogen dioxide produced is carried out in at least two stages the particulates in each stage are separated from the gas stream with an efficiency (W) of 0.5 - 0.95. The transmission of particulates to the next stage is 1-W. An Independent claim is included for a device for carrying out the process comprising at least two treatment units containi an catalyst (5, 7, 9) for oxidizing N2O to NO2 and a filter (6, 8, 10) for removing particulate.

公开(公告)号：DE19923781A1

公开(公告)日：2000-12-07

申请号：DE19923781

申请日：1999-05-22

Applicant: DEGUSSA

Inventor： SCHAEFER-SINDLINGER ADOLF ,  STREHLAU WOLFGANG ,  LOX EGBERT ,  KREUZER THOMAS ,  GOEBEL ULRICH

IPC: F01N3/02 ,  B01D46/42 ,  B01D53/94 ,  B01J35/04 ,  F01N3/023 ,  F01N3/035 ,  F01N3/18 ,  F01N3/24 ,  F01N3/28 ,  F01N13/02

Abstract: Process for removing carbon particulate from diesel engine exhaust gases by oxidation of nitrous oxide in the gases to nitro dioxide, separating the particulates and oxidizing them with the nitrogen dioxide produced is carried out in at least two stages the particulates in each stage are separated from the gas stream with an efficiency (W) of 0.5 - 0.95. The transmission of particulates to the next stage is 1-W. An Independent claim is included for a device for carrying out the process comprising at least two treatment units containi an catalyst (5, 7, 9) for oxidizing N2O to NO2 and a filter (6, 8, 10) for removing particulate.

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.