催化学报

催化学报 ›› 2010, Vol. 31 ›› Issue (6): 689-694.

• 研究论文 • 上一篇    下一篇

丙烷选择氧化单斜 TeMo5O16 催化剂中钒掺杂的作用

董雪, 朱艺涵, 李晗, 陆维敏   

  1. 浙江大学催化研究所, 浙江省应用化学重点实验室, 浙江杭州 310028
  • 收稿日期:2010-06-25 出版日期:2010-06-25 发布日期:2013-12-05

Roles of Vanadium Substitution of Monoclinic TeMo5O16 Catalyst for Propane Selective Oxidation

DONG Xue, ZHU Yihan, LI Han, LU Weimin*   

  1. Zhejiang Provincial Key Laboratory of Applied Chemistry, Institute of Catalysis, Zhejiang University, Hangzhou 310028, Zhejiang, China
  • Received:2010-06-25 Online:2010-06-25 Published:2013-12-05

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792

被引次数

3

摘要： 研究了在不同温度下 V 掺杂的单斜 TeMo5O16 催化剂上丙烷选择氧化反应性能. 结果发现, 在保持 TeMo5O16 相结构基本不变的条件下, V 的掺杂提高了催化剂的活性以及丙烯和丙烯醛等脱氢与选择氧化产物的收率. 通过程序升温表面反应、拉曼光谱、X 射线光电子能谱、X 射线衍射、程序升温还原和热重分析等手段对其原因进行了探讨. 结果表明, V 的掺杂引起催化剂表面金属–氧键发生变化, 提高了表面氧化还原中心的活性, 增加了酸性中心数目, 从而提高了催化剂活化丙烷能力. 同时, 较高的 V 掺杂量可以提高催化剂体相中晶格氧参与氧化还原的能力.

关键词: 丙烷, 选择氧化, 钼, 碲, 复合氧化物, 钒, 掺杂

Abstract: The vanadium-doped monoclinic TeMo5O16 catalysts were prepared and tested in the propane selective oxidation reaction. The doped catalysts showed high activity and high yield of propylene and acrolein. The catalysts were characterized by temperature-programmed surface reaction, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, H2 temperature-programmed reduction, and O2-thermogravity. The relationship between catalytic activity and catalyst properties on the surface and in the bulk was discussed. The results strongly suggested that the surface Mo–O bonds were changed by the V-doping. Thus the activity of surface redox sites was improved, and the amount of surface acid sites was increased, which promoted the activation and oxidation of propane. The bulk redox ability was further improved by a higher V-doping amount while the phase was unchanged basically.

Key words: propane, selective oxidation, molybdenum, tellurium, composite oxide, vanadium, doping