Abstract
CO adsorption and CO oxidation by O 2 were studied over alumina-supported copper and copper—chromium oxide from 300 to 673 K. After evacuation at room temperature, Cu + CO and carbonate-like complexes were observed on copper-containing catalysts upon CO adsorption. Both the copper and the chromium oxide species were easier to reduce on CuO*Cr 2O 3/Al 2O 3 compared with CuO/Al 2O 3 and Cr 2O 3/Al 2O 3 owing to the presence of a mixed oxidic phase. CO can react directly from the gas phase with oxygen at the surface under formation of a CO 2 surface species as a reaction intermediate. This indicates an Eley—Rideal mechanism. CO 2 adsorption results in bands similar to those observed upon CO and upon CO and O 2 admission. CO 2 inhibits the CO oxidation reaction in two ways — via the more weakly, reversibly bound CO 2, and via the more strongly, irreversibly held carbonates.
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