In this study, the selectivity of the reverse water-gas-shift reaction using pt/TiO2 catalysts was examined. The optimum calcination temperature was determined to be 923 K with regard to CO selectivity. The catalytic activity and Pt dispersion decreased as the calcination temperature was increased. TEM, XRD, and FT-IR analyses and TPR profiles confirmed that the selectivity of the Pt/TiO2 catalyst was dependent on the carbonate species formed on the reducible TiO2 sites and on the carbonyl species bonded to the Pt sites. (C) 2012 Elsevier B.V. All rights reserved.