Metal-containing spinel composition and process for using same

Abstract From the Canadian patent

A composition of matter comprising at least one metal-containing spinel which includes a first metal and a second metal having a valence higher than the valence of the first metal, a minor amount of at least one third metal component effective to promote the oxidation of sulfur dioxide to sulfur trioxide at sulfur dioxide oxidation conditions and, a minor amount of at least one fourth metal component effective to promote the reduction of first metal sulfate at first metal sulfate reduction conditions. These compositions are useful e.g. in, hydrocarbon conversion processes to reduce sulfur, oxide and/or nitrogen oxide atmospheric emissions.