A study on the effect of CeO2 addition to a Pt/TiO2 catalyst on the reverse water gas shift reaction

In this study, a series of catalysts with the composition 1 wt% Pt/X% CeO₂-Y% TiO₂ (where X and Y range from 0 to 20%) was prepared via impregnation. The effects of different ratios of CeO₂/TiO₂ on the catalytic activity were examined during the reverse water gas shift reaction (RWGS). The catalytic activities of the Pt-impregnated catalysts were enhanced by increasing CeO₂ loading. The activity tests, temperature-programmed reduction via H₂, and step test of an elementary RWGS reaction over the catalysts confirmed that the catalytic activity depends on the number of TiO₂ or CeO₂ sites, which participate in the RWGS reaction, on the surface of the support.