甲烷无氧芳构化反应催化剂Mo/HZSM-5的H_2-TPR研究  

H_2-TPR Study on Mo/HZSM-5 Catalyst for CH_4 Dehydroaromatization

作　　者：刘红梅[1] 徐奕德[2] 

机构地区：[1]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 [2]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

出　　处：《催化学报》2006年第4期319-323,共5页

基　　金：国家重点基础研究发展计划(G1999022406);中国博士后科学基金(023205037)资助项目

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.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.

关 键 词：甲烷 无氧芳构化 钼 HZSM-5分子筛 程序升温还原 

分 类 号：O643.36[理学—物理化学]