Monolithic Catalysts with Low Noble-Metal Content for Exhaust Purification of Small Gasoline Engines

摘要

A series of low noble-metal content monolithic catalysts for exhaust purification of small gasoline engines was investigated, and it was found that the Pt/Rh-OSM/Al_2O_3 (where OSM was oxygen storage material) catalyst with Ce_(0.5)Zr_(0.5)-MnO_x(3% MnO_x) OSM held low light-off temperature for CO, HC, and NO; quite wide three-way window, and outstanding thermal stability. The catalyst could efficiently control exhaust emission of small gasoline engines.