Abstract
The reforming of methane with CO2 was studied over 1wt% Rh/alumina, Pt/ZrO2, and Ce-promoted Pt/ZrO2 catalysts at 800°C and pressures of 1, 8, and 14 bar. It was found that high pressure resulted in greater carbon formation, lower methane and CO2 conversions, as well as a lower H2/CO ratio. Temperature-programmed oxidation (TPO), of the catalysts after reaction, shows several CO2 peaks for the Ce-promoted catalyst, indicating several sources or types of carbon and/or several locations on the catalyst are involved with carbon deposition. The change in the temperature and intensity of the TPO peaks with pressure indicates that more stable carbon is deposited at high pressure. Thermodynamic calculations for the endothermic reaction of CH4 with CO2, CH4 decomposition, and CO disproportionation were also performed. The results of these calculations are consistent with CO disproportionation being a larger contributor to carbon deposition at high pressure.
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