CATALYST FOR CLARIFICATION OF EXHAUST GAS AND ITS PREPARATION

摘要

PROBLEM TO BE SOLVED: To prevent Pt particles from growing and to suppress reaction of Rh with a carrier. SOLUTION: A metal cluster consisting of an alloy wherein at least parts of Pt and Rh are under solid soln. condition each other by reducing a soln. contg. Pt and Rh in a liq. phase and and the metal cluster is carried on a porous carrier. Rh with higher affinity with oxygen is deposited partially and the metal cluster particles are prevented thereby from growing and decrease in active points of the catalyst is suppressed. In addition, the reaction of Rh with alumina is also suppressed by preparing the metal cluster.