CATALYST FOR PURIFYING EXHAUST GAS

摘要

PROBLEM TO BE SOLVED: To prevent a noble metal from sintering at high temp. and improve heat resistance an resistance to sulfur poisoning. SOLUTION: A base body is constituted of an amorphous multiple oxide consisting of at least one NOx occluding element selected from alkali metal, alkaline earth metal and rear earth elements, a porous carrier and a noble metal catalyst and the noble metal catalyst is uniformly highly dispersed. There exists no possibility of elution of the NOx occluding element and the noble metal catalyst is kept under a highly dispersed condition.