Abstract
In view of the well-known promoting effect of reducible, oxides on the performance of noble metal catalysts it was attempted to clucidate the kinetics of the reaction of hydrogen and CO on clean and oxide-modified Rh surfaces, and in, particular to asses the effect of the metal-oxide boundary. Inverse supported metal catalysts were prepared by UHV deposition of Ti and V metal on the Rh surface in the presence of oxygen. After characterisation by AES and reduction in hydrogen the methanation kinetics was measured in an externally attached high pressure cell. The reaction is promoted by submonolayer quantities of titania or vanadia, but the reaction rates depend on the extent and temperature of hydrogen reduction. This dependence can be correlated with concomitant changes of the layered structure of the VOx deposits, and finally with the partial dissolution of V in the bulk, if the reduction temperature is increased.
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