Abstract
Selective CO methanation over Ru/Al 2O 3 and Ru/TiO 2 was investigated as a CO removal method from reforming gas, and the effect of reduction treatment and the support materials on the selectivity and activity was examined. CO methanation activity was degraded over both Ru catalysts by raising reduction treatment temperature, which brought about Ru particle growth except for Ru/TiO 2 reduced at 600 °C. Ru/TiO 2 showed higher CO methanation activity than Ru/Al 2O 3 due to smaller Ru particle size. A close correlation was found between CO 2 methanation rate and interfacial length of Ru particle and support, which indicates that the interface was identified as the reaction sites of CO 2 methanation in CO and CO 2 coexisting atmosphere. CO 2 methanation over Ru/TiO 2 was suppressed in spite of long length of the interface compared to Ru/Al 2O 3, stemming from the small amount of CO 2 adsorbed onto Ru/TiO 2. Ru/TiO 2 catalyst exhibited wider temperature window for selective CO methanation than Ru/Al 2O 3 catalyst.
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