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《Chinese Journal of Catalysis》 2001-06
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Study on Selective Oxidation of Isobutane over V_2O_5/SiO_2 Catalyst

GENG Yunfeng, ZHONG Shunhe *(College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)  
V 2O 5/SiO 2 catalyst samples were prepared by impregnation and sol gel method, respectively. The surface composition, structure, chemisorbility and activity of V 2O 5/SiO 2 were systematically studied by using XRD, IR, TPD and micro reactor. The results showed that there exist Lewis base sites ( V=O and V O V) and Lewis acid sites (V 5+ ) on the surface of the catalyst. Isobutane can be chemisorbed on the terminal oxygen of Lewis base sites V=O bonds by one or two H atoms in CH 3. Isobutene can be chemisorbed on the terminal oxygen of Lewis base sites V=O and on the bridging oxygen in V O V bonds by two H atoms and one C atom in CH 3, or chemisorbed on Lewis acid sites V 5+ by C=C bond. The main products of the selective oxidation of isobutane are isobutene, methylacrolein, methylacrylic acid and CO x on the catalyst. The reaction of intermediate product isobutene adsorbed on Lewis acid sites V 5+ with the adsorbed active oxygen on the same sites is the main reason for the formation of deeply oxidative product CO x .
【Fund】: 国家自然科学基金资助项目 ( 2 97730 31)
【CateGory Index】: O643.3
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