Water Gas Shift Activity of Pt/CexZr1-xO2 Catalysts in Sulfur-Containing Syngas

A series of Pt/CexZr1-xO2 catalysts were prepared by the wet-impregnation method, characterized by X-ray diffraction and temperature-programmed reduction, and tested in the water gas shift (WGS) reaction. The results show that the CexZr1-xO2 solid solution has higher redox ability, and doping ceria with zirconium apparently changes the pore structure. The Pt catalysts supported on CexZr1-xO2 has higher Pt dispersion and WGS activity in pure reforming syngas. The WGS activity dropped in sulfur-containing syngas over the Pt/CexZr1-xO2 catalysts. The loss of activity increases with the increase of H2S content, but the deactivation of the catalyst due to H2S adsorption is reversible and can be readily reversed in the reducing atmosphere of the WGS mixture without H2S.