催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (4): 409-414.

• 研究论文 • 上一篇    

MoVBiTeO/SiO2对丙烷选择氧化制丙烯醛反应的催化性能

何益明1,2,伊晓东1,黄传敬1,翁维正1,万惠霖1   

  1. 1 厦门大学化学系固体表面物理化学国家重点实验室, 物理化学研究所, 福建厦门 361005;2 中国科学院福建物质结构研究所结构化学国家重点实验室, 福建福州 350002
  • 收稿日期:2008-04-25 出版日期:2008-04-25 发布日期:2012-03-22

Catalytic Performance of MoVBiTeO/SiO2 for Selective Oxidation of Propane to Acrolein

HE Yiming1,2, YI Xiaodong1, HUANG Chuanjing1, WENG Weizheng1*, WAN Huilin1*   

  1. 1 State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry and Institute of Physical Chemistry, Xiamen University, Xiamen 361005, Fujian, China; 2 State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou 350002, Fujian, China
  • Received:2008-04-25 Online:2008-04-25 Published:2012-03-22

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682

被引次数

3

摘要： 用浸渍法制备了一系列不同Mo/V比的MoVBiTeO/SiO2催化剂,并用X射线衍射、拉曼光谱、X射线光电子能谱、程序升温还原和红外光谱等方法对催化剂的结构、氧化还原性质和酸性进行了表征,考察了催化剂对丙烷选择氧化制丙烯醛反应的催化性能. 结果表明, Mo与V组分之间存在较强的相互作用,调变了催化剂的结构,并形成了氧化还原循环(V5++Mo5+V4++Mo6+), 促进了催化剂中电子和O物种的传递,使催化剂的低温可还原性增强,催化活性提高. Mo组分有利于形成L酸位,而V组分有利于形成B酸位. 这可能是丙烯醛选择性随Mo/V比增大而逐渐提高的原因之一. 当Mo/V摩尔比为6时,催化剂具有最高的丙烯醛收率(9.7%).

关键词: 钼, 钒, 铋, 碲, 复合氧化物, 氧化硅, 负载型催化剂, 丙烷, 选择氧化, 丙烯醛

Abstract: A series of MoVBiTeO/SiO2 catalyst samples with different Mo/V ratios were prepared by the impregnation method. The catalyst structure, reducibility, and acidity were characterized by XRD, Raman, XPS, TPR, and FT-IR techniques, and the catalytic performance of the catalyst for selective oxidation of propane to acrolein was evaluated. The results indicated that the interaction between Mo and V components modified the catalyst structure, and the redox cycle of V5++Mo5+V4++Mo6+was formed. The improvement in the reducibility of the catalyst might be responsible for the increase in propane conversion. The V and Mo components were responsible for B acid and L acid, respectively. When the Mo/V ratio increased, the amount of B acid decreased, and the catalyst selectivity for acrolein increased. Among the investigated catalyst samples, the sample with a Mo/V molar ratio of 6 exhibited the best catalytic performance.

Key words: molybdenum, vanadium, bismuth, tellurium, composite oxide, silica, supported catalyst, propane, selective oxidation, acrolein