高能机械球磨法制备V_2O_5-TiO_2超细微粒催化剂  

Preparation of Ultrafine V_2O_5-TiO_2 Composite Oxide Catalyst by High-Energy Ball Milling Method

作　　者：林明[1] 范以宁[1] 刘浏[1] 许波连[1] 胡征[1] 陈懿[1] 

机构地区：[1]南京大学化学系介观材料科学实验室,南京210093

出　　处：《催化学报》2001年第6期585-588,共4页

基　　金：国家重点基础研究发展规划项目 (G19990 2 2 40 0 );南京大学分析测试基金资助项目

摘　　要：The ultrafine V 2O 5 TiO 2 composite oxide particles have been prepared by the high energy ball milling method and characterized by X ray diffraction, transmission electron microscopy, laser Raman spectroscopy, temperature programmed reduction, and microreactor testing. It has been shown that the milling process induces the formation of ultrafine V 2O 5 TiO 2 composite oxide particles with dispersed vanadium oxide on the surface of anatase TiO 2, accompanied by a decrease in particle size of V 2O 5 and TiO 2. The TPR results indicate that the strong interaction between dispersed V O species and TiO 2 increases the reducibility of the vanadium oxide. The catalytic properties of the catalysts for the selective oxidation of o xylene were evaluated. Under the similar o xylene conversion (58%), the ultrafine V 2O 5 TiO 2 composite oxide catalyst exhibits a higher selectivity for phthalic anhydride (44%) than the catalyst prepared by the conventional impregnation method (23%), and the catalyst composition has a great influence on the catalytic properties.The ultrafine V2O5-TiO2 composite oxide particles have been prepared by the high-energy ball milling method and characterized by X-ray diffraction, transmission electron microscopy, laser Raman spectroscopy, temperature-programmed reduction, and microreactor testing. It has been shown that the milling process induces the formation of ultrafine V2O5-TiO2 composite oxide particles with dispersed vanadium oxide on the surface of anatase TiO2, accompanied by a decrease in particle size of V2O5 and TiO2. The TPR results indicate that the strong interaction between dispersed V-O species and TiO2 increases the reducibility of the vanadium oxide. The catalytic properties of the catalysts for the selective oxidation of o-xylene were evaluated. Under the similar o-xylene conversion (58%), the ultrafine V2O5-TiO2 composite oxide catalyst exhibits a higher selectivity for phthalic anhydride (44%) than the catalyst prepared by the conventional impregnation method (23%), and the catalyst composition has a great influence on the catalytic properties.

关 键 词：五氧化二钒 二氧化钛 氧化物催化剂 超细微粒 球磨法 邻二甲苯 选择性氧化 制备 负载型催化剂 催化性能 

分 类 号：O643.3[理学—物理化学]