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题名: Methane dehydroaromatization over Mo/HZSM-5 catalyst: Effect of dealumination of HZSM-5 zeolite
作者: Song Yibing;  Sun Changyong;  Wu Yanqing;  Shen Wenjie;  Lin Liwu
关键词: methane ;  aromatization ;  molybdenum ;  HZSM-5 zeolite ;  supported catalyst ;  dealumination ;  hydrothermal treatment ;  high temperature nitrogen treatment
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2007-04-01
卷: 28, 期:4, 页:371-376
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: Two dealumination methods were used to modify the framework composition of the HZSM-5 zeolite. The structure and acidity of dealuminated zeolite samples were investigated by MAS NMR and FT-IR. It was found that the catalytic performance of the Mo/HZSM-5 catalyst for methane dehydroaromatization was closely related to the acidity of the HZSM-5 zeolite. On the parent zeolite with n (Si)/n (Al) approximate to 27, the presence of superfluous strong Bronsted acid sites caused severe coke deposition during the reaction. Hydrothermal treatment of the parent zeolite extracted tetrahedral Al from the framework and thus led to a significant reduction in the number of Bronsted acid sites. The formation of aromatics over this hydrothermally treated zeolite was suppressed owing to the deficiency of acid sites available for the aromatization of C-2 intermediates. High-temperature N-2, treatment induced mild dealumination of HZSM-5, destroyed the origin strong Bronsted acid sites, but retained sufficient weak acid sites. This treatment effectively restrained coke deposition and satisfied the requirement of the aromatization of C-2 intermediates during the reaction. Therefore, a remarkable improvement in the catalyst durability and selectivity for aromatics was observed.
关键词[WOS]: HYDROTHERMAL POST-SYNTHESIS ;  COKE-RESISTANCE ;  BENZENE ;  NAPHTHALENE ;  ENHANCE ;  AROMATIZATION ;  CONVERSION
语种: 英语
WOS记录号: WOS:000246604600017
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140668
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.Shantou Univ, Dept Chem, Shantou 515063, Guangdong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Song Yibing,Sun Changyong,Wu Yanqing,et al. Methane dehydroaromatization over Mo/HZSM-5 catalyst: Effect of dealumination of HZSM-5 zeolite[J]. CHINESE JOURNAL OF CATALYSIS,2007,28(4):371-376.
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