Effect of Nickel Addition on Ceria-Supported Platinum Catalysts for Medium-Temperature Shift Reaction in Fuel Processors

Medium-temperature shift reaction (MTS, 280340 degrees C) has received much attention for use in fuel processors. In this study, bifunctional Pt-Ni/CeO2 catalysts were prepared by different Pt (0.10.5%) and Ni (520%) loadings, and investigated for MTS reaction. X-ray diffraction, N2 adsorption and temperature-programmed reduction tests were used to characterize the prepared samples. The results showed that Pt-Ni bimetallic catalysts have higher CO conversion in comparison to Pt/CeO2 monometallic catalyst. Furthermore, the sequential synthesis method of Pt and Ni impregnation was preferred to the simultaneous one, which is due to the better Pt dispersion on catalytic surface. Steam to carbon ratio variations study showed the maximum CO conversion to be in the range of 4.5.