Co-Mo/MgO-Al2O3水煤气变换催化剂的XPS表征

The catalyst CoO-MoO3/MgO-Al2O3 for water gas shift reaction was prepared by means of mixed calcinations. The sulfurized catalyst prepared and contrast ones (MoO3/Al2O3, CoO/Al2O3 and MoO3/MgO-Al2O3) were characterized by using XPS technique. The results show that the state of Mo species on the catalyst samples coexist as Mo6+, Mo5+ and Mo4+. The content of the Mo6+ species decrease after the addition of the promoter MgO or CoO to the catalyst and the contrast ones, but the concentration of Mo5+ and [S-S]2- increase, and the catalytic activity at low temperature was found to be improved (99% of Co conversion at 200°C being found).The pathway of the catalytic reaction may follow the mechanism Mo4+~Mo5+.