Abstract--Transient experiments were applied to the study of the adsorbed CO intermediate, (CO),,, formed during the CO2 methanation reaction on a 2% Ru/TiO2 catalyst at 383 K.Step-up experiments showed that the (CO),, formation steps are inhibited by H20 and enhanced by H 2.Step-down experiments showed that the (CO),, hydrogenation is not influenced by the partial pressure of water. Based on the fact that water inhibits the overall CO 2 methanation, it is deduced that the rate limiting process in the overall reaction is (CO),, formation.
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