催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (2): 352-356.DOI: 10.3724/SP.J.1088.2011.01009

• 研究论文 • 上一篇    下一篇

Bi 添加对 MoVO/AlPO4 催化剂异丁烯选择氧化反应性能的影响

王希涛, 王芬, 蒋实, 钟顺和   

  1. 天津大学化工学院, 天津市应用催化科学与工程重点实验室, 天津 300072
  • 收稿日期:2010-10-09 修回日期:2010-11-18 出版日期:2011-01-26 发布日期:2014-06-25

Effects of Bi on the Catalytic Performance of MoVO/AlPO4 Catalyst for Selective Oxidation of Isobutene

WANG Xitao, WANG Fen, JIANG Shi, ZHONG Shunhe*   

  1. Tianjin Key Laboratory of Applied Catalysis Science and Technology, College of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2010-10-09 Revised:2010-11-18 Online:2011-01-26 Published:2014-06-25

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摘要： 采用溶胶-凝胶法制备了 MoVO/AlPO4 和 MoVBiO/AlPO4 催化剂, 运用 X 射线衍射、激光拉曼光谱、X 光电子能谱、程序升温还原等技术对催化剂进行了表征, 考察了 Bi 的添加对催化剂结构及其催化异丁烯选择氧化制甲基丙烯醛 (MAL) 反应性能的影响. 结果表明, 适量 Bi 的引入可显著提高 MoVO-AlPO4 催化剂上异丁烯选择氧化反应性能, MAL 选择性由 29.1% 提高至 75.2%. 这与 Bi 的加入降低了催化剂表面强酸位数量, 促进了 Mo 氧化物和 V 氧化物的分散, 以及提高了催化剂表面 V5+/V4+比例有关.

关键词: 溶胶-凝胶法, 异丁烯, 选择氧化, 甲基丙烯醛, 钼, 钒, 铋, 磷酸铝

Abstract: MoVO/AlPO4 and MoVBiO/AlPO4 catalysts have been prepared by the sol-gel method. The effects of Bi on surface acidity, distribution of active species, V5+/V4+ ratio, crystalline phase, and catalytic performance for selective oxidation of isobutene to methacrolein were investigated. The catalysts were characterized by X-ray diffraction, FT-Raman spectroscopy, temperature programmed reduction and X-ray photoelectron spectroscopy. The results showed that the addition of Bi at a proper amount obviously improves the catalytic performance of catalyst for selective oxidation of isobutene. Methacrolein selectivity is elevated from 29.1% to 75.2% with the increase of Bi/V ratio from 0 to 0.5. The surface acidity, crystalline phase, and dispersion of molybdenum and vanadium oxides species are responsible for the catalytic properties of the MoVBiO/AlPO4 catalyst, which are especially related to the V5+/V4+ ratio on the surface.

Key words: sol-gel method, iso-butene, selective oxidation, methacrolein, molybdenum, vanadium, bismuth, aluminum phosphate