06677264 is referenced by 40 patents and cites 8 patents.

A catalyst for purifying exhaust gases of a diesel engine. The catalyst contains two functional layers superimposed on an inert supporting body, whereby the first layer, which is situated directly on the supporting body, has a nitrogen oxide storage function and the second layer, which is in direct contact with the exhaust gas, has a catalytic function. The second functional layer additionally has a hydrocarbon-storage function and its catalytic function is provided by catalytically active noble metals of the platinum group which are deposited in highly dispersed form on finely divided, acidic carrier materials. Nitrogen oxides in the oxygen-rich exhaust gas of a diesel engine can be converted with optimal utilization of the reductive constituents contained in the exhaust gas. For this purpose, no reducing agents going beyond the reductive components (carbon monoxide and hydrocarbons) which are contained as a consequence of incomplete combustion need to be added to the exhaust gas. Nevertheless, rates of conversion in respect of the nitrogen oxides are obtained, averaged over practical driving cycles, which lie distinctly above the rates of conversion of conventional reduction catalysts.

Title
Catalyst for cleaning up the exhaust gases of a diesel engine
Application Number
9/442633
Publication Number
6677264 (B1)
Application Date
November 18, 1999
Publication Date
January 13, 2004
Inventor
Wilfried Müller
Karben
US
Thomas Kreuzer
Karben
US
Egbert Lox
Hanau
US
Wolfgang Strehlau
Dossenheim
US
Harald Klein
Bessenbach
US
Agent
Kalow & Springut
US
Assignee
Degussa Huls Aktiengesellschaft
US
IPC
B01J 21/16
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