The mechanism of methane reforming with carbon dioxide: Comparison of supported Pt and Ni (Co) catalysts

The interaction of the catalyst 5.16 wt % Pt/alpha-Al2O3 with CH4, CO2, O-2, and CH4 + CO2 pulses is studied using a setup involving the differential scanning calorimeter DSC-111 and a system for chromatographic analysis. Comparison of the results obtained with analogous data on Ni/Al2O3 and Co/Al2O3 suggests that methane activation occurs via a common pathway via dissociative chemisorption on the metal surface with the formation of H-2 and carbon on all the catalysts studied. Carbon dioxide activation on Pt/Al2O3 differs from its activation on Ni(Co)/Al2O3. It follows from the enthalpy of formation that carbon on Pt/Al2O3 is graphite-like in contrast to carbide carbon on Ni(Co)/Al2O3. This graphite carbon is more stable and less reactive.