高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

氧化镁负载的钼钒磷酸铜催化剂的积碳行为

周广栋1,2, 韩洋1, 刘杰1, 李丽敏3, 甄开吉1, 王海水2, 程铁欣1   

    1. 吉林大学化学学院, 长春 130021;
    2. 中国科学院长春应用化学研究所, 长春 130022;
    3. 东北师范大学化学学院, 长春 130024
  • 收稿日期:2006-04-22 修回日期:1900-01-01 出版日期:2007-02-10 发布日期:2007-02-10
  • 通讯作者: 程铁欣

Carbon Deposition Behavior over Copper Salts of Molybdovanadophosphoric Acid Catalyst Supported by Magnesia

ZHOU Guang-Dong1,2, HAN Yang1, LIU Jie1, LI Li-Min3, ZHEN Kai-Ji1, WANG Hai-Shui2, CHENG Tie-Xin1   

    1. College of Chemistry, Jilin University, Changchun 130021, China;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
    3. Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
  • Received:2006-04-22 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10
  • Contact: CHENG Tie-Xin

PDF (PC)

被引次数

10

摘要： 研究了氧化镁负载的钼钒磷酸铜催化剂在正己醇氧化反应中的积碳行为. 结果表明, 积碳主要以CHx形式存在于催化剂表面, 积碳的形成没有导致催化剂的失活. XRD, IR和XPS等光谱表征结果说明积碳后催化剂结构没有发生改变, 并且载体表面的钼钒磷酸铜有利于积碳的消除. TPO研究结果表明, 积碳在催化剂上有两种存在位置: 一种沉积在钼钒磷酸铜表面, 这种位置的积碳在低温下容易被烧除; 另一种沉积在载体氧化镁的表面, 需要高温才能烧除. 随着反应时间的增加, 积碳量达到定值.

关键词: 积碳, 杂多酸, 氧化镁, 负载

Abstract: MgO supported copper salt of molybdovanadophosphoric acid H4PMo11VO40 catalysts were prepared in alcohol by impregnation and the carbon deposition over these catalysts during the n-hexanol oxidation reaction was studied. The coke predominantly deposited on the catalyst surface in the form of CHx, and it was not found that it caused the deactivation of the catalyst. The XRD, IR, XPS characterizations reveal that the Keggin structure of the CPMV was unaffected by carbon deposition. Moreover, it was shown that the supported CPMVs over the MgO surface can be beneficial to eliminate the coke. The temperature programmed oxidation(TPO) study showed that coke was formed over the catalyst on two different sites: (1) deposited on the CPMVs which can be burn off at a low temperature; (2) deposited on the MgO which could only be removed at higher temperature. The coke content reached constant with the reaction time increasing.

Key words: Carbon deposition, Heteropoly acid, Magnesia, Supported-load

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