Degussa - Huls Ag

Degussa Aktiengesellschaft

Jurgen Leyrer

Egbert Lox

Thomas Kreuzer

Rainer Domesle

Bernd Engler

Dieter Lindner

Stephan Eckhoff

Wilfried Muller

Hans Van Tillaart

A process is disclosed for lowering nitrogen oxide levels in combustion engine exhaust gas by a reduction catalyst and by controlling the exhaust gas temperature upstream from the catalyst to a constant value, at which the catalyst exhibits maximum conversion for nitrogen oxides. It is possible to maintain maximum conversion over a wide range of engine outlet temperatures of the exhaust gas.

Process for lowering nitrogen oxide levels in combustion engine exhaust

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 aluminum silicate, aluminum oxide and titanium oxide, wherein the aluminum silicate has a ratio by weight of silicon dioxide to aluminum oxide of 0.005 to 1 and the platinum group metals are deposited on only the further metal oxides.

Diesel catalytic converter

A catalyst is described for reducing the quantity of nitrogen oxides in lean exhaust gas of motor vehicle engines. The catalyst contains, on a structure reinforcing body, a first catalytic coating of an aluminum oxide and/or cerium oxide of large surface area impregnated with a mixture of iridium and platinum as catalytically active noble metal components. A second catalytic coating including a zeolite of the mordenite type containing copper and/or iron is applied to the first coating layer.

Reduction in the quantity of NO.sub.x in lean exhaust gas of motor

Growing community of inventors

Rheinfelden, Germany

Jurgen Leyrer