负载型复合氧化物催化剂WO_3/(TiO_2-SiO_2)催化性能的研究

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

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的存在大大改善WO3的分散状态,虽然使WO3在TiO2-S iO2的还原温度升高,但在TiO2的调变下,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。

The TiO2-SiO2 compls supporter was prepared by using gas phase adsorption method and WO3/（ TiO2-SiO2 ） Catalyst was prepared by using impregnation method, Such techniques as LRS and TPR were used to study the surface dispersion state of WO3 on the surface of TiO2-SiO2 complex support. The results showed that the dispersion of TiO2 on SiO2 surface could enhance interaction between WO3 and support, and raised the dispersion threshold of WO3 on support surface. The TPR experimental results showed that the dispersion state of WO3 was effectively improved in the presence of TiO2 ; and despite the increase of the reduction temperature of WO3 on the surface of TiO2-SiO2 catalyst, the interaction between WO3 and the support enhanced in the modification of TiO2. The HDS, HYD and BHD activities of catalyst on SiO2 support modified by TiO2 were higher than those of catalyst on unmodified SiO2 support.