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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
KeywordMethane Aromatization Molybdenum Hzsm-5 Zeolite Supported Catalyst Dealumination Hydrothermal Treatment High Temperature Nitrogen Treatment
Source PublicationCHINESE JOURNAL OF CATALYSIS
2007-04-01
Volume28Issue:4Pages:371-376
Indexed BySCI
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
WOS SubjectChemistry, Applied ; Chemistry, Physical ; Engineering, Chemical
WOS Research AreaChemistry ; Engineering
WOS KeywordHYDROTHERMAL POST-SYNTHESIS ; COKE-RESISTANCE ; BENZENE ; NAPHTHALENE ; ENHANCE ; AROMATIZATION ; CONVERSION
AbstractTwo 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.
Language英语
WOS IDWOS:000246604600017
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://cas-ir.dicp.ac.cn/handle/321008/140668
Collection中国科学院大连化学物理研究所
Affiliation1.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
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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