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Interaction of 1-Butene and n-Butane with a Sulfate-Promoted IronOxide.-Preadsorption of butane does not change the decomposition of SO2-4-Fe2O3 significantly. It is desorbed above 320 K. The formation of SO2 and O2 at 700 K is very similar in both cases. In contrast, in the presence of preadsorbed 1-butene CH4, SO2, and CO2 but no H2S are found as major components in the complicated decomposition. The 1-butene promoted process is complete at 650 K (IR, temp.-programmed desorption/reaction). -(LEE, J. S.; YEOM, M. H.; PARK, D. S.; J.