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Methane dehydroaromatization over Mo/HZSM-5 catalyst: Effect of dealumination of HZSM-5 zeolite
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
2007-04-01
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
关键词[WOS]HYDROTHERMAL POST-SYNTHESIS ; COKE-RESISTANCE ; BENZENE ; NAPHTHALENE ; ENHANCE ; AROMATIZATION ; CONVERSION
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.
语种英语
WOS记录号WOS:000246604600017
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/140668
专题中国科学院大连化学物理研究所
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
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GB/T 7714
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.
APA Song Yibing,Sun Changyong,Wu Yanqing,Shen Wenjie,&Lin Liwu.(2007).Methane dehydroaromatization over Mo/HZSM-5 catalyst: Effect of dealumination of HZSM-5 zeolite.CHINESE JOURNAL OF CATALYSIS,28(4),371-376.
MLA Song Yibing,et al."Methane dehydroaromatization over Mo/HZSM-5 catalyst: Effect of dealumination of HZSM-5 zeolite".CHINESE JOURNAL OF CATALYSIS 28.4(2007):371-376.
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