公开(公告)号：CA2285825C

公开(公告)日：2009-01-20

申请号：CA2285825

申请日：1999-10-12

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  GOBEL ULRICH ,  DOMESLE RAINER

IPC: B01J20/04 ,  B01D53/56 ,  B01D53/94 ,  B01J23/58 ,  B01J23/63 ,  B01J27/053 ,  B01J27/055 ,  B01J37/02 ,  B01J37/08

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 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：AU2671801A

公开(公告)日：2001-06-25

申请号：AU2671801

申请日：2000-12-05

Applicant: VOLKSWAGEN AG ,  DMC2 DEGUSSA METALS CATALYSTS

Inventor： POTT EKKEHARD ,  HAHN HERMANN ,  HOHNE JURGEN ,  GOBEL ULRICH

IPC: F01P7/02 ,  B01D53/94 ,  F01N3/08 ,  F01P11/10 ,  F02D41/02 ,  F02D41/14 ,  F02M25/07 ,  F01N3/00

Abstract: A method for the desulfurization of an NO x storage catalyst arranged in an exhaust system of an internal combustion engine, whereby, for the desulfurization, the internal combustion engine is alternatingly operated in a lean mode at lambda>1 and a rich mode at lambda n ), whereby the interval (I n ) lasts from the beginning of an n th rich operating phase (T f,n ), until the measured value drops below a predetermined lambda threshold value (S f ) downstream from the NO x storage catalyst ( 16 ). Furthermore, the progress of the desulfurization is monitored, using a change in a lambda probe voltage (U n ) downstream from the NO x storage catalyst ( 16 ), which is determined at the end of a predetermined interval at the beginning of an n th rich operating phase (T f,n ).

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：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：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：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：AU735504B2

公开(公告)日：2001-07-12

申请号：AU2249899

申请日：1999-03-29

Applicant: DEGUSSA

Inventor： STREHLAU WOLFGANG ,  GOBEL ULRICH ,  LOX EGBERT ,  MULLER 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：AU2244099A

公开(公告)日：1999-10-07

申请号：AU2244099

申请日：1999-03-26

Applicant: DEGUSSA

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

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：CA2280631C

公开(公告)日：2009-06-02

申请号：CA2280631

申请日：1999-08-23

Applicant: DEGUSSA

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

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

Abstract: The invention relates to a nitrogen oxide storage material which contains at least one storage component for nitrogen oxides, in the form of an oxide, mixed oxide, carbonate or hydroxide of the alkaline earth metals magnesium, calcium, strontium and barium and the alkali metals potassium and caesium, on a high surface area support material. The storage material is characterised in that the support material is selected from the group comprising doped cerium oxide, cerium/zirconium mixed oxide, calcium titanate, strontium titanate, barium titanate, barium stannate, barium zirconate, magnesium oxide, lanthanum oxide, praseodymium oxide, samarium oxide, neodymium oxide, yttrium oxide, zirconium silicate, yttrium barium cuprate, lead titanate, tin titanate, bismuth titanate, lanthanum cobaltate, lanthanum manganate and barium cuprate, or mixtures thereof.

公开(公告)号：CA2299602C

公开(公告)日：2007-09-11

申请号：CA2299602

申请日：2000-02-25

Applicant: DEGUSSA

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

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

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.