Composition for oxidizing carbon monoxide in the presence of sulfur compounds with reduced formation of SO3 from SO2

摘要

A catalyst for oxidizing carbon monoxide in a gas stream is provided. The catalyst contains a combination of a platinum component and one or more bismuth oxides in amounts sufficient to convert carbon monoxide to carbon dioxide in the presence of oxygen. The bismuth oxides inhibit the tendency of the platinum to convert SO2 in the gas stream, if any, to SO3. The atomic molar ratio of bismuth to platinum is preferably in the range of from about 0.1:1 to 6:1.