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/gamma-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/gamma-Al2O3-CP-80 catalyst prepared by co-deposition-precipitation at 80 degrees C showed the best catalytic performance with the maximum CO conversion of 85% at 120 degrees C. The catalysts prepared under different conditions were further characterized by temperature-programmed reduction (H-2-TPR) and in situ DRIFTS, and the promoting role of Ce was clarified.