WO3/(TiO2-SiO2)催化剂的表面分散状态及催化性能的研究

用气相流动吸附法制备复合载体,用浸渍法制备WO3/(TiO2-S iO2)催化剂.应用LRS和TPR技术研究WO3在复合载体TIO2-S iO2表面的分散状态,发现TiO2在S iO2表面的分散可增强WO3与载体之间的相互作用,提高WO3在载体表面的分散阈值.另外TPR实验证明,TiO2的存在不仅大大改善WO3的分散状态,而且使WO3在TiO2-S iO2的还原温度升高,WO3与载体之间的作用增强.负载于经TiO2调变的S iO2上的催化剂其HDS、HYD、BHD活性高于负载于单纯S iO2上的催化剂的活性.

Studies on Dispersion State and Catalytic Activities of WO3/(TiO2-SiO2)

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).