Stable High-Pressure Methane Dry Reforming Under Excess of CO2

Dry reforming of methane (DRM), the conversion of carbon dioxide and methane into syngas, offers great promise for the recycling of CO2. However, fast catalyst deactivation, especially at the industrially required high pressure, still hampers this process. Here we present a comprehensive study of DRM operation at high pressure (7-28 bars). Our results demonstrate that, under equimolar CH4 : CO(2)mixtures, coke formation is unavoidable at high pressures for all catalysts under study. However, under substoichiometric CH4 : CO(2)ratios (1 : 3), a stable high pressure operation can be achieved for most catalysts with no sign of deactivation for at least 60 hours at 14 bars, 800 degrees C and 7500 h(-1). In addition to the enhanced stability, under these conditions, the amount of CO(2)abated per mol of CH(4)fed increases by a 50 %.