Abstract
Reforming of methane with carbon dioxide to synthesis gas (CO/H 2) has been investigated over rhodium supported on SiO 2, TiO 2, γ-Al 2O 3, MgO, CeO 2, and YSZ (ZrO 2 (8 mol% Y 2O 3)) catalysts in the temperature range of 650–750°C at 1 bar total pressure. A strong carrier effect on the initial specific activity, deactivation rate, and carbon accumulation was found to exist. A strong dependence of the specific activity of the methane reforming reaction on rhodium particle size was observed over certain catalysts. Tracing experiments (using 13CH 4) coupled with temperature-programmed oxidation (TPO) revealed that the carbon species accumulated on the surface of the Rh/Al 2O 3 catalyst during reforming reaction at 750°C are primarily derived from the CO 2 molecular route. The amount of carbon present on the working catalyst surface which is derived from the CH 4 molecular route is found to be very small.
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