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学科主题: 物理化学
题名: Study of crystallization process of SAPO-11 molecular sieve
作者: Li Bing1;  Tian Peng1;  Qi Yue1;  Zhang Lin1;  Xu Shutao1;  Su Xiong1, 2;  Fan Dong1, 2;  Liu Zhongmin1
通讯作者: 刘中民
关键词: SAPO-11 molecular sieve ;  Characterization ;  Crystallization process ;  Silicon distribution
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2013-03-01
DOI: 10.1016/S1872-2067(12)60542-7
卷: 34, 期:3, 页:593-603
收录类别: SCI
合作性质: 
文章类型: Article
部门归属: DNL12
项目归属: DNL1202
产权排名: 待补充
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
资助者: 1,1
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: The crystallization process of SAPO-11 was studied using a combination of X-ray diffraction, scanning electron microscopy, X-ray fluorescence, nuclear magnetic resonance, and X-ray photoelectron spectroscopy. In the initial stage of crystallization, SAPO-11 was formed along with an unknown crystalline material composed of Si-P-Al. As crystallization evolved, the crystalline material dissolved. The SAPO-11 formation rate increased greatly, which is characteristic of fast crystallization. After 2.33 h, the relative crystallinity of SAPO-11 reached similar to 100% and remained at a high level until crystallization was complete. Si was incorporated into the SAPO-11 framework from the initial stage of crystallization. The Si content of the solid samples increased with crystallization time. Most of the Si atoms existed as Si islands in the SAPO-11 framework, resulting in the presence of multiple coordination environments, i.e., Si(nAl, (4 - n)Si), n = 0-4. X-ray photoelectron spectroscopy analysis revealed Si enrichment on the external surfaces of the SAPO-11 crystals. Based on the experimental results, the distribution of Si in the crystals is not uniform, showing an increasing trend from the core to the surface. (C) 2013, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
关键词[WOS]: DRY-GEL CONVERSION ;  SOLID-STATE NMR ;  MICROPOROUS ALUMINOPHOSPHATE ALPO4-11 ;  HYDROISOMERIZATION PERFORMANCE ;  SI DISTRIBUTION ;  CRYSTALS ;  CATALYSTS ;  MEDIA
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000317873600014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/119396
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, Dalian Natl Lab Clean Energy, Natl Engn Lab Methanoltoolefins, Dalian 116023, Liaoning, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Li Bing,Tian Peng,Qi Yue,et al. Study of crystallization process of SAPO-11 molecular sieve[J]. CHINESE JOURNAL OF CATALYSIS,2013,34(3):593-603.
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