Oxidative steam reforming of methane over Ni/α-Al2O3 modified with trace Pd

Ni catalysts supported on α-Al2O3 modified with small amounts of Pd were prepared by different impregnation methods to investigate catalytic performance and catalyst bed temperature profile in oxidative steam reforming of methane. The Pd + Ni bimetallic catalysts prepared by the co-impregnation method showed higher resistance to hot-spot formation than monometallic Ni and bimetallic Pd/Ni catalysts prepared by two sequential impregnations, in particular, Pt + Ni catalysts prepared by the co-impregnation method. The additive effect of Pd on the Pd/Ni catalysts was discussed on the bases of metal particle size and structural analysis by Pd K-edge extended X-ray absorption fine structure (EXAFS).

The Pd + Ni bimetallic catalysts supported on α-Al2O3 prepared by a co-impregnation method are much more effective for the suppression of hot-spot formation in oxidative steam reforming of methane than the corresponding monometallic catalysts, which is caused by synergy between Pd with high reducibility and Ni with high reforming activity.Figure optionsDownload as PowerPoint slide