Abstract
With ever-increasing demands linked with decreasing sulphur levels in gasoline fuels, base metal catalysts have become attractive as alternatives. The Ni-Au system is an interesting alloy for use in the reaction between CO and NO, partly because of the large difference between the heats of chemisorption of NO and CO on the two metals. This paper presents a study of the course of NO reduction by CO which additionally made it possible to trace changes in the activity and selectivity of the process for alloys of varied Ni-Au composition and alloys of varied Pt-Rh composition together with the effects of Pt and Rh dispersion and the concentration of B5 sites on the surface of the Pt and Rh catalysts.
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