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题名: Effects of High Temperature Water Steaming on the Active Centers of ZnHZSM-5
作者: Cheng Mojie1;  Yang Yashu1
关键词: ZnHZSM-5 ;  Water steaming ;  Propane ;  Active centers ;  Dealumination
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 1996
DOI: 10.3866/PKU.WHXB19960810
卷: 12, 期:8, 页:721-726
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
英文摘要: The effects of high temperature water steaming (HTWS) on the structure of HZSM-5 and ZnHZSM-5 catalysts have been investigated using XRD, XPS and IR spectrum of adsorbed pyridine, and the aromatization of propane has been tested as a probe reaction to show the change of catalytic performance. The result indicate that the treatment of HTWS nearly has no significant effect on the crystallinity of zeolite catalysts, but it lead to the dealumination of zeolite framework and the migration of zinc ions departing from the cation positions and results in the enrichment of aluminum and zinc content on the outer surface of zeolite crystallites and the decrease of catalyst acidity, and comparing the variation of Si/Al with Zn/Si and Zn/Al, it is shown that the framework aluminum species with zinc counterions are more difficult to detach from the framework than those with proton counterions. The variation of the reaction activity and selectivity of propane aromatization also verifies that the active centers of B and Zn-L acids are diminished differently depending on the treatment of HTWS processing.
语种: 英语
WOS记录号: WOS:000207600100010
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142776
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.Acad Sinica, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Cheng Mojie,Yang Yashu. Effects of High Temperature Water Steaming on the Active Centers of ZnHZSM-5[J]. ACTA PHYSICO-CHIMICA SINICA,1996,12(8):721-726.
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