Abstract
It is well-known that catalysts containing small quantities of noble metals (e.g., Pt, Au) that are highly dispersed on Group IV and related tetravalent metal oxides (e.g., TiO2, ZrO2, CeO2, ThO2) display, once activated, high conversion for water-gas shift (WGS). The mechanism suggested for this by many authors is bimolecular in nature. In one view, adsorption of CO on the partially reducible oxide produces formates by reaction with active bridging OH groups, followed by water-assisted formate decomposition by dehydrogenation, with this second step being facilitated by metal particles at the metal–support interface. Considering this group of oxides, HfO2, as far as we are aware, had not yet been studied as a potential candidate for low temperature water-gas shift (LTWGS). Thus, in this contribution, catalysts composed of Pt supported on HfO2 were prepared and tested. Catalyst testing results suggest that this system is, like Pt/ZrO2 and Pt/CeO2, active for the WGS reaction, although additional studies ar...
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