催化学报

催化学报 ›› 2006, Vol. 27 ›› Issue (4): 319-323.

• 研究论文 • 上一篇    下一篇

甲烷无氧芳构化反应催化剂Mo/HZSM-5的H2-TPR研究

刘红梅2,徐奕德1   

  1. 1 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023;2 清华大学化学系有机光电子与分子工程教育部重点实验室, 北京 100084
  • 收稿日期:2006-04-25 出版日期:2006-04-25 发布日期:1984-12-26

H2-TPR Study on Mo/HZSM-5 Catalyst for CH4 Dehydroaromatization

LIU Hongmei2, XU Yide1*   

  1. 1 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, The Chinese Academy of Sciences, Dalian 116023, Liaoning, China; 2 Key Laboratory of Organic Optoelectronics and Molecular Engineering of Education Ministry, Department of Chemistry, Tsinghua University, Beijing 100084, China
  • Received:2006-04-25 Online:2006-04-25 Published:1984-12-26

PDF

842

被引次数

49

摘要： 采用H2-TPR技术研究了不同方法制备的Mo/HZSM-5催化剂,并借助 1H MAS NMR等表征手段对Mo/HZSM-5催化剂还原过程中可能出现的6个TPR谱峰进行了详细归属,首次指认了分布于分子筛孔道内并与B酸性位相互作用的Mo物种的还原峰. 此外,还考察了各种Mo基催化剂在甲烷无氧芳构化反应中的催化性能. 结果表明,与B酸中心相互作用的Mo物种比其他形式的Mo物种具有更好的活性和稳定性.

关键词: 甲烷, 无氧芳构化, 钼, HZSM-5分子筛, 程序升温还原

Abstract: Temperatured-programmed reduction (TPR) of hydrogen was used to investigate the reducibility of Mo species on Mo/HZSM-5 catalysts prepared by different methods, and the possible six H2-consumption peaks were assigned precisely with the help of 1H MAS NMR. The TPR peaks corresponding to the reduction of Mo species associated with Bronsted acid sites were first identified. In addition, the catalytic performance of various Mo-based catalysts was studied for methane dehydroaromatization. The Mo species that is located in the channels of HZSM-5 zeolite and associated with Bronsted acid site is more active and stable for the formation of one-ring aromatics in the methane dehydroaromatization.

Key words: methane, dehydroaromatization, molybdenum, HZSM-5, temperature-programmed reduction