Abstract
This study investigated the origins of CO2 selectivity in the oxidative coupling of methane over MnOx–Na2WO4/(SiO2, TiO2, or ZrO2) by means of steady-state isotopic transient kinetic analysis. The kind of support affects the concentration of surface intermediates leading to CO2. The lowest concentration was determined for the MnOx–Na2WO4/SiO2 catalyst exhibiting the lowest CO2 selectivity, while the most CO2-producing MnOx–Na2WO4/ZrO2 catalyst has the highest concentration. The lifetime of the intermediates is less sensitive to the kind of support. Employing different isotopes (18O2 or 13CH4) led to different lifetimes, suggesting the involvement of secondary exchange reactions with surface oxygen.
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