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MAS NMR, ESR and TPD studies of Mo/HZSM-5 catalysts: evidence for the migration of molybdenum species into the zeolitic channels
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
2000
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
关键词[WOS]TEMPERATURE-PROGRAMMED DESORPTION ; ZSM-5 ZEOLITES ; BRONSTED-ACID ; METHANE ; AROMATIZATION ; CONVERSION ; DEHYDROGENATION ; SURFACE ; BENZENE ; ADSORPTION
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.
语种英语
WOS记录号WOS:000087257100008
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被引频次:87[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/138771
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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GB/T 7714
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.
APA Ma, D,Zhang, WP,Shu, YY,Liu, XM,Xu, YD,&Bao, XH.(2000).MAS NMR, ESR and TPD studies of Mo/HZSM-5 catalysts: evidence for the migration of molybdenum species into the zeolitic channels.CATALYSIS LETTERS,66(3),155-160.
MLA Ma, D,et al."MAS NMR, ESR and TPD studies of Mo/HZSM-5 catalysts: evidence for the migration of molybdenum species into the zeolitic channels".CATALYSIS LETTERS 66.3(2000):155-160.
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