Selective CO聽methanation聽from H2-rich stream has been regarded as a promising route for deep removal of low CO concentration and catalytic hydrogen purification processes. This work is focused on the development of more efficient catalysts applied in practical conditions. For this purpose, we prepared a series of catalysts based on聽Ru聽supported over titania and promoted with small amounts of聽Rh聽and Pt. Characterization details revealed that Rh and Pt modify the electronic properties of Ru. The results of聽catalytic activity聽showed that Pt has a negative effect since it promotes the reverse聽water gas shift reaction聽decreasing the selectivity of methanation but Rh increases remarkably the activity and selectivity of CO methanation. The obtained results suggest that RuRh-based catalyst could become important for the treatment of industrial-volume streams.
