Preferential CO Oxidation on Ce-Promoted Pt/γ-Al2O3 Catalysts under H2-Rich Atmosphere

Preferential CO oxidation (PROX) under hydrogen-rich atmosphere was investigated over Ce-promoted Pt/γ-Al2O3 catalysts. The preparation procedures and conditions, including co-deposition-precipitation (CP), sequential deposition-precipitation (SP), and deposition-precipitation temperature, had great impacts on the catalytic activity. Among the catalysts investigated, the Pt-Ce/y-Al2O3-CP- 80 catalyst prepared by co-deposition-precipitation at 80°C showed the best catalytic performance with the maximum CO conversion of 85% at 120°C. The catalysts prepared under different conditions were further characterized by temperature-programmed reduction (H2-TPR) and in situ DRIFTS. The promoting role of Ce was clarified.