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题名: Post-steam-treatment of Mo/HZSM-5 catalysts: An alternative and effective approach for enhancing their catalytic performances of methane dehydroaromatization
作者: Wang, HX;  Su, LL;  Zhuang, JQ;  Tan, DL;  Xu, YD;  Bao, XH
刊名: JOURNAL OF PHYSICAL CHEMISTRY B
发表日期: 2003-11-27
DOI: 10.1021/jp0225931
卷: 107, 期:47, 页:12964-12972
收录类别: SCI
文章类型: Article
部门归属: 502
项目归属: 502
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Post-steam-treatment is a facile and effective method for improving the catalytic performances of Mo/HZSM-5 catalysts in methane dehydroaromatization under nonoxidative conditions. The treatment can enhance the stability of the catalyst and also give a higher methane conversion and a higher yield of light aromatics, as well as a decrease in the formation rate of carbonaceous deposits. (27)Al, (29)Si, and (1)H multinuclear magic angle spinning nuclear magnetic resonance, X-ray photoelectron spectroscopy, X-ray diffraction, X-ray fluorescence spectroscopy, and thermogravimetric analysis measurements as well as catalytic reaction evaluations were employed to conduct comparative studies on the properties of the catalysts before and after the post-steam-treatment. The results revealed that the number of free Bronsted acid sites per unit cell decreased, while more Mo species migrated into the HZSM-5 channels for the 6Mo/HZSM-5 catalysts after the post-steam-treatment. In addition, the average pore diameter was also larger for the post-steam-treated catalysts, and this was advantageous for mass transport of the reaction products. However, a severe post-steam-treatment, i.e., with longer treating time, of the 6Mo/HZSM-5 catalyst will lead to the formation of the Al(2)(MoO(4))(3) phases, which is detrimental to the reaction.
关键词[WOS]: ACID SITES ;  NONOXIDATIVE CONDITIONS ;  DEHYDRO-AROMATIZATION ;  ZEOLITE CATALYSTS ;  HZSM-5 ZEOLITE ;  BRONSTED-ACID ;  MAS NMR ;  MOLYBDENUM ;  CONVERSION ;  BENZENE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000186762200009
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/82885
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Wang, HX,Su, LL,Zhuang, JQ,et al. Post-steam-treatment of Mo/HZSM-5 catalysts: An alternative and effective approach for enhancing their catalytic performances of methane dehydroaromatization[J]. JOURNAL OF PHYSICAL CHEMISTRY B,2003,107(47):12964-12972.
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