SYNTHESIS GAS PRODUCTION FROM METHANE OVER NICKEL CATALYSTS

摘要

Reforming of methane with carbon dioxide was examined over Ni, Co, and Fe catalysts supported on cerium oxide, and the following results were obtained. The most effective catalyst among the three was Ni/CeO_2 catalyst, where 95% CH_4 conversion was achieved, H_2/CO ratio in the product gas was about unity, and the activity and selectivity were stable for 50 h at 1123 K and 1 g·h/mol. Co catalyst, next to Ni catalyst, showed high activity, selectivity, and durability when reduced fully. Fe catalyst showed poor activity and selectivity. Although Ni/CeO_2 catalyst deactivates very quickly at low temperature of 973 K, the deactivated catalyst becomes active and stable when exposed to a high temperature (1123 K) reaction gas mixture. The excellent performance can be also obtained by treating the catalyst in an inactive atmosphere at a high temperature of 1123 K. It seems that the high activity and stability is due to the strong metal support interaction.