Degussa Aktiengesellschaft

Peter Schubert

Edgar Koberstein

Rainer Domesle

Bernd Engler

Birgit Bertsch-Frank

Thomas Lieser

Felix Schmidt

Klaus Mueller

Claas-Juergen Klasen

Method for the preparation of stabilized sodium percarbonate

A catalyst for purifying the exhaust gases of internal combustion engines with improved light-off behavior and improved durability with reduced specific noble-metal content is disclosed which uses active aluminum oxide provided with customary promoters as carrier and platinum and/or palladium and rhodium in customary amounts as noble metals. In addition, it contains one or more base metals in amounts up to 5 times the mass of the total noble metal which are brought into the immediate vicinity of the rhodium by means of a special manufacturing technique.

Catalyst for purifying the exhaust gases of internal combustion engines

A catalyst is described made of active aluminum oxide with additives of CeO.sub.2, ZrO.sub.2, and Fe.sub.2 O.sub.3 and/or NiO as carrier and an active phase, applied thereon and consisting of platinum, palladium and/or rhodium, and a base metal, which is obtainable by impregnation of the additive-containing carrier with solutions of salts of the metals for the active phase, wherein the base metal of the active phase is cerium, by drying, and by heating to 250.degree. to 650.degree. C. The catalyst can be used for the oxidation and/or reduction of exhaust gases from internal combustion engines.

Catalyst for purifying exhaust gases from internal combustion engines

A support material for three-way catalysts containing platinum group metal and having reduced tendency for H.sub.2 S emission formed of an annealed, spray-dried combination of aluminum oxide and cerium oxide.

Support material for three-way catalysts containing platinum group metal

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Hanau, Germany

Peter Schubert