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题名: Dehydroaromatization of methane over Mo/HZSM-5 pretreated with NH4F: Further study on effect of pretreatment temperature
作者: Li, YG;  Huang, XM;  Liu, L;  Liu, XM;  Shen, WJ;  Bao, XH;  Xu, YD
关键词: methane ;  aromatization ;  ammonium fluoride ;  HZSM-5 ;  molybdenum oxide ;  supported catalyst ;  carbonaceous deposit
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2006-02-01
卷: 27, 期:2, 页:166-170
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Mo/HZSM-5 was prepared from HZSM-5 zeolite that was pretreated with NH4F at different temperatures. The results of Al-27 magic angle spinning (MAS) NMR show that the pretreatment with NH4F at 623 K causes serious dealumination on HZSM-5, forming a new wide peak at around delta = - 12.7, which is attributed to AlO6-xFx species. An enhanced interaction between MoO3 and HZSM-5 is confirmed by NH3 temperature-programmed desorption and Al-27 MAS NMR characterization for Mo/HZSM-5 samples, and this interaction becomes more obvious when the pretreatment was carried out at a higher temperature. The coked Mo/HZSM-5 samples prepared with NH4F-pretreated HZSM-5 were characterized by thermogravimetry and temperature-programmed oxidation, and the results show that the NH4F pretreatment improves the catalyst resistance to the coke formation. This is related not only to the decrease in Bronsted acid sites on Mo/HZSM-5, but also to the compatibility of the amounts of Bronsted acid sites and the active molybdenum species.
关键词[WOS]: SINGLE-PASS CONVERSION ;  NONOXIDATIVE CONDITIONS ;  DEHYDRO-AROMATIZATION ;  CATALYTIC-PROPERTIES ;  HZSM-5 ZEOLITE ;  ACIDITY
语种: 英语
WOS记录号: WOS:000235990300016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140157
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:
Li, YG,Huang, XM,Liu, L,et al. Dehydroaromatization of methane over Mo/HZSM-5 pretreated with NH4F: Further study on effect of pretreatment temperature[J]. CHINESE JOURNAL OF CATALYSIS,2006,27(2):166-170.
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