CATALYSTS FOR CONTROLLING AUTO EXHAUST EMISSIONS INCLUDING HYDROCARBON, CARBON, MONOXIDE, NITROGEN OXIDES AND HYDROGEN SULFIDE

摘要

A catalyst, which is capable of controlling not only HC, CO and NOx, but also H2S emission from the tail pipe of catalytic converter-equipped automobiles, is made of noble metals promoted with ceria-rich rare earth oxides, preferably doubly promoted along with alkali metal oxides, and oxides of nickel and/or iron as an H2S gettering ingredient. The oxides of nickel and/or iron are present in an H2S gettering effective amount and in an amount up to 10 wt%. The alumina support can have additionally from 0 to 20% SiO2 present.