Catalyst for automotive lean-burn engine and process for preparing the same

Abstract

The present invention relates to a catalyst for automotive lean-burn engine comprising platinum impregnated on a zeolite support and a process for preparing the same. In accordance with the invention, the catalyst comprising a platinum-impregnated zeolite support can be prepared by sublimation, where the zeolite support effectively eliminates hydrocarbons from automotive exhaust gases by adsorption, and platinum as an active component of the catalyst exerts its catalytic activity through the direct decomposition of nitrogen oxides contained in automotive exhaust gases. Furthermore, the catalyst of the invention provides a widened temperature window for maximum catalytic activity and improved catalytic activity, compared to those of the conventional catalysts. Accordingly, the invented catalyst for automotive lean-burn engine can effectively remove polluting substances such as nitrogen oxides and hydrocarbon present in lean-burn exhaust gases by selective reduction in a continuous reactor, and may be useful in the post-treatment of automotive exhaust gases.