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题名: Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes
作者: Zhang, WP;  Ma, D;  Han, XW;  Liu, XM;  Bao, XH;  Guo, XW;  Wang, XS
关键词: solid-state NMR ;  Mo/HZSM-5 ;  nanosized HZSM-5 zeolite ;  methane activation ;  probe molecule ;  perfluorotributyl amine
刊名: JOURNAL OF CATALYSIS
发表日期: 1999-12-10
卷: 188, 期:2, 页:393-402
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The interaction between Mo species and a conventionally microsized and particularly nanosized HZSM-5 support was studied by high-resolution multinuclear solid-state NMR techniques. As proved by Al-27 and Si-29 MAS as well as CP/MAS NMR investigations, this interaction was so strong that the framework aluminum of both microsized and nanosized HZSM-5 zeolites could be extracted. With increasing Mo loading, more nonframework aluminum, resonanced at ca. 30 ppm, appeared in the Al-27 MAS NMR spectrum of the Mo-loaded nanosized HZSM-5 catalyst. Meanwhile, this strong interaction led to the formation of more new Al-2(MoO4)(3) crystallines on the nanosized HZSM-5 support than on the microsized HZSM-5 support. The appearance of Al-2(MoO4)(3) crystallines resulted in fewer active catalysts for the methane dehyro-aromatization. The results of H-1 MAS NMR using perfluorotributyl amine as a probe molecule demonstrated that Mo species preferentially reacted with the silanols and nonframework AlOH on the external surface of microsized and nanosized HZSM-5 zeolites. In addition, impregnated Mo species remained predominantly on the external surface of the nanosized HZSM-5 zeolite, although there was a possibility that they might migrate into the lattice channels of the microsized HZSM-5 zeolite. The migration of some Mo species into the zeolite channels might be beneficial for the conversion of methane to aromatics in the absence of oxygen. (C) 1999 Academic Press.
关键词[WOS]: H-1-AL-27 CROSS-POLARIZATION ;  NUCLEAR-MAGNETIC-RESONANCE ;  RESOLUTION AL-27 NMR ;  ION ZSM-5 ZEOLITES ;  ACID SITES ;  BRONSTED-ACID ;  MAS NMR ;  CATALYSTS ;  CONVERSION ;  BENZENE
语种: 英语
WOS记录号: WOS:000084292500017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138549
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
2.Dalian Univ Technol, Lab Comprehens Utilizat Carbonaceous Resources, Dalian 116012, Peoples R China

Recommended Citation:
Zhang, WP,Ma, D,Han, XW,et al. Methane dehydro-aromatization over Mo/HZSM-5 in the absence of oxygen: A multinuclear solid-state NMR study of the interaction between supported Mo species and HZSM-5 zeolite with different crystal sizes[J]. JOURNAL OF CATALYSIS,1999,188(2):393-402.
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