Effect of Calcination Temperature of Support on the Performance of Co-Mo/MgO-Al2O3 Water-Gas Shift Catalyst

摘要

The effect of calcination temperature of the MgO-Al2O3 mixed oxide Support on the physicochemical properties of the support and the performance of the Co-Mo-based water-gas shift catalyst was Studied by means of X-ray diffraction, N-2 adsorption-desorption temperature-programmed desorption, temperature-programmed reduction, and electron paramagnetic resonance. The activity testing results showed that the catalysts with the mixed oxide supports calcined at 600-800 degrees C exhibited high activity for the reaction. The physicochemical characterization results indicated that MgO-Al2O3 mixed oxide supports calcined at 600-900 degrees C existed as amorphous compound MgAl2O4-xMgo-yAl(2)O(3), Oil which more middle strength acid-base sites were formed. For the Co-Mo/MgO-Al2O3 catalysts in oxidation state, more octahedral Mo species were found, while more oxysulfo-Mo5+ species were detected oil the sulfurized catalysts. These species were closely related to the catalytic activity.