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题名: Synthesis and characterization of galloaluminosilicate/gallosilicalite (MFI) and their evaluation in methane dehydro-aromatization
作者: Ma, D;  Shu, YY;  Zhang, CL;  Zhang, WP;  Han, XW;  Xu, YD;  Bao, XH
关键词: gallosilicalite (MFI) ;  galloaluminosilicate (MFI) ;  MAS NMR ;  methane ;  aromatization
刊名: JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
发表日期: 2001-03-01
卷: 168, 期:1-2, 页:139-146
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: MFI-type gallosilicalite and galloaluminosilicate were synthesized by hydro-thermal method. For all the as-synthesized Ga-containing samples, Ga-71 MAS NMR spectra confirmed that the Ga3+ cations are located in the zeolite framework. As for the case in galloaluminosilicate, Ga3+ and Al3+ cations can enter the zeolitic site at the same time, but there is a competition between the two cations to incorporate into the zeolite framework. Quantitative MAS NMR results suggest that the incorporation of the Ga3+ cations is seriously inhibited by that of the Al3+ cations if they existed together, while the reversed process is not observed. The catalytic performances of non-oxidative aromatization of methane on these zeolite catalysts, with or without loading of MoO3, have been investigated. The results show that zeolites containing framework Ga species, which are excellent catalysts for propane aromatization, are poor catalyst supports for methane dehydro-aromatization. The catalytic performance of the molybdenum-loaded H-gallosilicate (MFI) catalysts present an activity for methane activation and subsequent aromatization. however, it is not as good as that of the Mo-loaded H-galloaluminosilicate (MFI) catalysts. Bearing this in mind, it was suggested that zeolitic acidity that originated from the heteroatom substitution is essential for catalyzing methane aromatization. The weaker acidity of framework GaO4- tetrahedral species as compared to framework AlO4- tetrahedral species is suggested to be responsible for the inferior activity for methane aromatization reaction. (C) 2001 Elsevier Science B.V. All rights reserved.
关键词[WOS]: MO-BASED CATALYSTS ;  ZEOLITE CATALYSTS ;  PROPANE ;  GALLIUM ;  GALLOSILICATE ;  CONVERSION
语种: 英语
WOS记录号: WOS:000167526500018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138925
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,Shu, YY,Zhang, CL,et al. Synthesis and characterization of galloaluminosilicate/gallosilicalite (MFI) and their evaluation in methane dehydro-aromatization[J]. JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,2001,168(1-2):139-146.
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