No abstract

No abstract

No abstract

No abstract

Simultaneous methanation of CO and C02 was investigated using highly active novel type composite catalysts to provide the foundation for a new efficient process of methane production. The catalyst constituents such as 5 % Ni-2.7 % La2O3-0.6% Ru were supported on a spherical (3.0 mm) silica carrier having meso (5 nm) and macro (600 nm) bimodal pore structures. The reaction-gas mixture, containing a considerably high concentration of CO and C02 with excessive hydrogen, was allowed to flow at high space velocity at atmospheric pressure. With the rise in reaction temperature, C02 methanation was enhanced in succession to almost total consumption of CO, and the complete conversion of both CO and C02 into methane with 100% selectivity and a high space-time yield (61 mol dm-3 h~1) at a low temperature such as 270 °C was achieved. On the basis of kinetic data in consideration with heat and mass transfer, the cause of this enhancement is discussed.