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题名: Control of crystal transformation and mixed crystals of some zeolites and optimum conditions for synthesis of monocrystal zeolites
作者: Peng, JB;  Xie, SJ;  Wang, QX;  Xu, LY
关键词: MCM-22 ;  ZSM-5 ;  ZSM-35 ;  mordenite ;  crystal transformation ;  crystal mixture
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2002-07-01
卷: 23, 期:4, 页:363-366
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: The influence of reaction temperature and reaction time on the crystallization of zeolites MCM-22, ZSM-5, ZSM-35 and mordenite was studied under the moderate ratio of silicon to aluminum using hexamethyleneimide as a template. MCM-22 was found to be an easily formed phase in this synthetic system because it appeared in the early stage of the crystallization process at both higher temperature and lower temperature. Whereas MCM-22 zeolite partially transformed to ZSM-5 and ZSM-35 with prolonging the reaction time at higher temperature, and finally transformed to ZSM-35. With this rule, the co-crystalline zeolite of MCM-22 and ZSM-35 was easily produced. The similar results of ZSM-5 and ZSM-35 mixed crystals could be achieved by varying reaction time at appropriate temperature. Upon analyzing the crystallization area of zeolites MCM-22, ZSM-5, ZSM-35 and mordenite, it is reasonable that the crystal transformations between these zeolites are prone to happen in this synthetic system, because all the zeolites have the same 5-ring sub-units, which bring little resistance to the reconstruction of frameworks, and the stability changing of the channel systems propels the occurrence of alternation of the linking modes of 5-ring units, leading to the formation of other type zeolites.
关键词[WOS]: MCM-22
语种: 英语
WOS记录号: WOS:000177387000019
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139080
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, Liaoning, Peoples R China

Recommended Citation:
Peng, JB,Xie, SJ,Wang, QX,et al. Control of crystal transformation and mixed crystals of some zeolites and optimum conditions for synthesis of monocrystal zeolites[J]. CHINESE JOURNAL OF CATALYSIS,2002,23(4):363-366.
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