On Catalytic Activities of Supported Complex Oxide WO_3/(TiO_2-SiO_2)

]The TiO_2-SiO_2compls supporter was prepared by using gas phase adsorption method and WO_3/(TiO_2-SiO_2) Catalyst was prepared by using impregnation method.Such techniques as LRS and TPR were used to study the surface dispersion state of WO_3 on the surface of TiO_2-SiO_2 complex support.The results showed that the dispersion of TiO_2 on SiO_2 surface could enhance interaction between WO_3 and support,and raised the dispersion threshold of WO_3 on support surface.The TPR experimental results showed that the dispersion state of WO_3 was effectively improved in the presence of TiO_2;and despite the increase of the reduction temperature of WO_3 on the surface of TiO_2-SiO_2 catalyst,the interaction between WO_3 and the support enhanced in the modification of TiO_2.The HDS,HYD and BHD activities of catalyst on SiO_2 support modified by TiO_2 were higher than those of catalyst on unmodified SiO_2 support.