Derivation of Initial Rate Equations for Low-temperature Water Gas Shift Reaction over Pt–Re/ZrO2 Catalysts

The effect of the partial pressure of CO and H 2 O on the initial reaction rate of LT-WGS over a Pt-Re/ZrO 2 catalyst with superior catalytic activity was evaluated. As a result, the reaction order was approximately zero with respect to CO and ca. 0.6 with respect to H 2 O, which indicates that CO is strongly adsorbed onto the catalyst surface in contrast to H 2 O. The theoretical rate equation was derived from the Langmuir-Hinshelwood (L-H) mechanism and was in good agreement with the experimental data.