Preparation of Highly Dispersed Anchored Catalysts by Photochemical Activation of Adsorbed Species and Their Photocatalytic Activities

吸附物质光化学活化制备高分散锚定催化剂及其光催化活性

基本信息

批准号：
62550595
负责人：
ANPO Masakazu
金额：
$ 1.28万
依托单位：
University of Osaka Prefecture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Photochemical activation of various transition metal compounds adsorbed on innert support surfaces is expected to be a promising method to prepare highly dispersed welldefined catalysts. In this research, the advantage of this method to prepare the highly dispersed anchored oxide catalysts and their photocatalytic activities have been investigated for the systems of TiCl_4, MoCl_5, and VoCl_3 adsorbed on porous Vycor glass.Especially, highly dispersed anchored vanadium oxide catalysts have been first prepared by using facile reaction of the photochemically activated VoCl_3 molecules with surface OH groups on Vycor glass. Anchored vanadium oxides prepared by the prepsent photochemical method exhibit a higher activity for the photocatalytic isomerization reaction of 2-butene and much higher yields in the phosphorescence, as compared with those obtained for the vanadium oxides prepared by conventional impregnation method. A good linear relationship between the yields of photocatalytic isomerization and the yields of phosphorescence from the charge transfer excited triplet state of the surface vanadyl species in tetrahedral coordination is obtained, indicating that not only the surface vanadyl species paly a significant role in the photocatalytic reaction on vanadium oxide catalysts, but also a photochemical activation method of adsorbed compounds leads to the higher photocatalytic activity due to their higher dispersion of metal oxides than impregnation method.

在Innert支撑表面吸附的各种过渡金属化合物的光化学激活有望成为准备高度分散良好定义的催化剂的一种有前途的方法。在这项研究中，该方法的优势是准备高度分散的锚定氧化催化剂及其光催化活性，用于TICL_4，MOCL_5和VOCL_3的系统。首先使用光化学激活的VOCL_3分子与Vycor玻璃上的表面OH基团的易变反应制备。与传统浸渍法制备的钒氧化物相比，通过预启用光化学方法制备的锚定氧化氧化物对2-丁烯的光催化异构化反应和磷光氧化物所获得的含量更高。获得了四面体配位中表面钒基物质的电荷转移激发三重态的磷光单位的产率与磷光的产量之间的良好线性关系，这不仅表明表面钒基物种在光触态反应中的表面钒物种在光催化反应中的重要作用不仅表明氧化钒催化剂，以及吸附化合物的光化学激活方法，由于金属氧化物对金属氧化物的分散率高于浸渍方法，因此具有更高的光催化活性。