A series of sulfur-tolerant Co-Mo/MgO-Al2O3-TiO2 catalysts promoted by TiO2 were prepared by kneading method and characterized by temperature-progr ammed reduction, temperature-programmed sulfurization and in-situ infra-r ed spectroscopy. The catalyst activity for water gas shift reaction was tested u nder atmosphere in an ordinary tubular reactor. The results indicate that TiO2 promotes the activity of Co-Mo/MgO-Al2O3-TiO2 catalyst and decreases t he reducing and sulfurizing temperature by changing interaction between active c omposition and carrier. In-situ infra-red spectra show that TiO2 decreas es the saturation level of active Mo and increases the coordinate capacity of ac tive Mo with CO.
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