The effect of the morphological characteristics of TiO2 supports on the reverse water–gas shift reaction over Pt/TiO2 catalysts

The effect of the morphological characteristics of a TiO2 support on the reverse water–gas shift reaction over Pt/TiO2 catalysts was examined. The activity of Pt catalysts with 6 different types of TiO2 supports varied during the reverse water–gas shift reaction. Analysis using H2 Temperature Programmed Reduction (TPR) and Temperature Programmed Desorption (TPD) confirmed that the active sites of the Pt/TiO2 catalyst included both the Pt sites and the TiO2 sites, which were reducible, and the difference in the activity of the Pt/TiO2 catalysts was dependent on the reducibility of the TiO2 supports. X-ray diffraction (XRD) analysis showed that the TiO2 crystallite size was a key factor that dictated the reducibility of the TiO2 sites.

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► The Pt/TiO2 catalyst shows a great activity in the RWGS reaction.
► Catalytic activity was highly dependent on TiO2 support's reducibility.
► Reducibility of TiO2 support was also dependent on TiO2 crystallite size.
► TiO2 crystallite size is a key factor in the RWGS reaction over Pt/TiO2 catalyst.