Abstract
Dry reforming of methane and 13C-labeled methane were studied over Pt/ZrO2, Pt/Ce-ZrO2, and 1%wtRh/Al2O3 at several pressures. It appears that carbon deposited on the catalysts resulted from both methane and CO2 . The presence of approximately equal ratios of 13C- and 12C-containing products suggests that the oxygen exchange reaction between CO and CO2 is very fast. Temperature-programmed oxidation of carbon formed on the catalysts indicates that CO disproportionation contributes significantly to carbon deposition at lower and higher pressures. The Rh/alumina supported catalyst is the most resistant toward carbon deposition both at lower and higher pressures. In all catalysts, methane and CO2 conversions as well as H2/CO ratios decreased with increasing pressure.
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