2006•Journal of Molecular Catalysis(China)Requires access
Studies on Dispersion State and Catalytic Activities of WO_(3)/(TiO_(2)-SiO_(2))
Liang Jun-fang
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Abstract
the TiO_(2)-SiO_(2)comples supporter were 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 improved effectively,the reduction temperature of WO_(3) on the surface of TiO_(2)-SiO_(2) catalyst was enhanced and the reduchion amount was increased.The HDS,HYD,BHD activities of catalyst which supprted on SiO_(2)modified by TiO_(2) were higher than that of catalyst which single supported on SiO_(2).