【摘要】 以无机盐 TiCl4为原料制备 TiO₂溶胶 ,并利用溶胶胶粒修饰法制备 SiO₂-TiO₂、 ZrO₂-TiO₂、 WO₃-TiO3、 MoO3-TiO₂及 Pt/TiO₂光催化剂 ,用于光催化氧化甲醛反应 ,考察添加物对催化剂光催化性能的影响 .其中 ,SiO₂-TiO₂催化剂的光催化氧化降解甲醛性能最好 ,而 MoO₃-TiO₂的催化性能最差 .SiO₂-TiO₂催化剂优良的光催化性能可归于 SiO₂-TiO₂催化剂的高比表面积 ,高空隙率 ,小晶粒粒径和强吸光性能等性质的综合影响 .更多还原

【Abstract】 Titania sols were prepared by acid hydrolysis of a TiCl₄ precursor and mixed oxides SiO₂-TiO₂,ZrO₂-TiO₂,WO₃-TiO₃ and MoO₃-TiO₂ as well as Pt/TiO₂ catalysts for the photocatalytic oxidation of formaldehyde were obtained by using the method of the modification of sol particles.The influence of the additives on the photocatalytic activity was investigated.Comparing with pure TiO₂,the addition of silica or zirconia increased the photocatalytic activity,while the addition of Pt and MoO₃ decreased the activity,and the addition of WO₃ had little effect on the activity.Among these catalysts,the activity of the SiO₂-TiO₂ catalyst was the best while that of the MoO₃-TiO₂ catalyst was the worst.It is of great significance that the conversion of formaldehyde was increased up to 94％ over the SiO₂-TiO₂ catalyst.The increased activity of the SiO₂-TiO₂ catalyst was due to the higher surface area and porosity,the smaller crystallite size and the stronger adsorption of UV light.A comparison of our catalyst compositions with those in the literature suggested that the difference in activity due to the addition of a second metal oxide maybe caused by the surface chemistry of the catalysts,particularly the acidity.更多还原