Abstract: Disclosed herein is an exhaust gas purifying catalyst composition for reducing hydrogen sulfide, including active alumina, supporting platinum and/or palladium, along with rhodium; a metal selected from the group consisting of Ba, La, Pr and Zr; cerium oxides; and zeolite.

Abstract: Disclosed herein is a three-way conversion (TWC) catalyst containing little or no rhodium for purifying exhaust gases of an internal combustion engine, having a multi-layers structure, including a lower layer including an alumina support and an oxygen storage material; an intermediate layer including alumina support impregnated only with palladium and a zirconia-rich oxygen storage material; and an upper layer including alumina support impregnated with platinum, minimum rhodium and platinum, or platinum-palladium and a ceria-rich oxygen storage material.

Abstract: Disclosed herein is an exhaust gas purifying catalyst composition for reducing hydrogen sulfide, including active alumina, supporting platinum and/or palladium, along with rhodium; a metal selected from the group consisting of Ba, La, Pr and Zr; cerium oxides; and zeolite.

Abstract: The invention relates to a catalyst composition for purifying exhaust gases of an internal combustion engine including a support impregnated with a first platinum group metal component and a metal component including gallium, which is a catalyst of a type commonly called a “Three-Way Conversion (TWC)” catalyst, and which improves the reduction of NOx and the oxidation of HC and CO.