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, temper...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.展开更多
The lanthanum molybdovanadophosphoric tetrabasic heteropoly complex was synthesized.Catalytic properties of the title heteropoly complex for selective oxidation of ethylbezene to acetonphenone was investigated.The sui...The lanthanum molybdovanadophosphoric tetrabasic heteropoly complex was synthesized.Catalytic properties of the title heteropoly complex for selective oxidation of ethylbezene to acetonphenone was investigated.The suitable reaction conditions was discussed.展开更多
文摘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.
文摘The lanthanum molybdovanadophosphoric tetrabasic heteropoly complex was synthesized.Catalytic properties of the title heteropoly complex for selective oxidation of ethylbezene to acetonphenone was investigated.The suitable reaction conditions was discussed.
