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Catalysts for controlling auto exhaust emissions including hydrocarbon, carbon monoxide, nitrogen oxides and hydrogen sulfide and method of making the catalysts
Catalysts for controlling auto exhaust emissions including hydrocarbon, carbon monoxide, nitrogen oxides and hydrogen sulfide and method of making the catalysts
A catalyst, which is capable of controlling not only HC, CO and NOx, but also H.sub.2 S 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 H.sub.2 S gettering ingredient. The oxides of nickel and/or iron are present in an H.sub.2 S gettering effective amount and in an amount up to 10 wt %. The alumina support can have additionally from 0 to 20% SiO.sub.2 present.
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