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Synthesis and characterization of galloaluminosilicate/gallosilicalite (MFI) and their evaluation in methane dehydro-aromatization
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
2001-03-01
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
关键词[WOS]MO-BASED CATALYSTS ; ZEOLITE CATALYSTS ; PROPANE ; GALLIUM ; GALLOSILICATE ; CONVERSION
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.
语种英语
WOS记录号WOS:000167526500018
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/138925
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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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.
APA Ma, D.,Shu, YY.,Zhang, CL.,Zhang, WP.,Han, XW.,...&Bao, XH.(2001).Synthesis and characterization of galloaluminosilicate/gallosilicalite (MFI) and their evaluation in methane dehydro-aromatization.JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL,168(1-2),139-146.
MLA Ma, D,et al."Synthesis and characterization of galloaluminosilicate/gallosilicalite (MFI) and their evaluation in methane dehydro-aromatization".JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL 168.1-2(2001):139-146.
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