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题名: MAS NMR, ESR and TPD studies of Mo/HZSM-5 catalysts: evidence for the migration of molybdenum species into the zeolitic channels
作者: Ma, D;  Zhang, WP;  Shu, YY;  Liu, XM;  Xu, YD;  Bao, XH
关键词: methane aromatization ;  bifunctional catalysis ;  molybdenum ;  magnetic resonance
刊名: CATALYSIS LETTERS
发表日期: 2000
卷: 66, 期:3, 页:155-160
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: NH(3)-TPD, MAS NMR and ESR spectroscopies were employed to investigate Mo-modified HZSM-5 catalysts prepared by impregnation. It was found that the modification of Mo ions results in a pronounced decrease in the intensity of (1)H MAS NMR resonance originating from Bronsted acid sites in the zeolites and a distinct splitting of Mo(5+) ESR signals, which is attributed to the interaction of Mo with the Al atom of the zeolite framework. This presents distinct evidence that Mo ions migrate from the external surface of the zeolite into the lattice channels during the impregnation and subsequent treatment. The remaining Bronsted acid sites associated with the migrated Mo ions form the bifunctional catalytic centers that may be responsible for the outstanding catalytic performance in methane aromatization.
关键词[WOS]: TEMPERATURE-PROGRAMMED DESORPTION ;  ZSM-5 ZEOLITES ;  BRONSTED-ACID ;  METHANE ;  AROMATIZATION ;  CONVERSION ;  DEHYDROGENATION ;  SURFACE ;  BENZENE ;  ADSORPTION
语种: 英语
WOS记录号: WOS:000087257100008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138771
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:
Ma, D,Zhang, WP,Shu, YY,et al. MAS NMR, ESR and TPD studies of Mo/HZSM-5 catalysts: evidence for the migration of molybdenum species into the zeolitic channels[J]. CATALYSIS LETTERS,2000,66(3):155-160.
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