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题名: Molecular engineering of microporous crystals: (III) The influence of water content on the crystallization of microporous aluminophosphate AlPO4-11
作者: Zhang, Bin1;  Xu, Jun2;  Fan, Fengtao3;  Guo, Qiang3;  Tong, Xiaoqiang1;  Yan, Wenfu1;  Yu, Jihong1;  Deng, Feng2;  Li, Can3;  Xu, Ruren1
关键词: Aluminophosphate ;  AlPO4-11 ;  AEL ;  Crystallization ;  Zeolite
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2012
DOI: 10.1016/j.micromeso.2011.06.018
卷: 147, 期:1, 页:212-221
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 ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: The influence of water content on the crystallization of the microporous aluminophosphate AlPO4-11 was investigated by a combination of in situ UV Raman and ex situ XRD and NMR characterizations. Under high water content conditions (Al2O3:H2O = 1:20-69), an AlPO4-5 intermediated formed first and later co-existed with AlPO4-11. In the last stage of crystallization, the crystalline AlPO4-5 completely disappeared and well-crystallized AlPO4-11 was obtained. The position of the three signals observed in the P-31 MAS NMR spectra of the isolated solid samples did not change during the hydrothermal treatment, suggesting that the fragments containing the P site in the junction of 6- and 4-membered rings of both AlPO4-5 and AlPO4-11 formed first and that the environments of the P sites were very similar to those in the final structure. A significant increase of Al concentration in liquid media was observed before the appearance of XRD detectable AlPO4-11. Under low water content conditions (Al2O3:H2O = 1:15), the AlPO4-11 was directly crystallized from the initial mixture. In situ Raman spectra showed that the 10-membered rings were complete by the time the transformation of octahedral Al to tetrahedral Al was finished and that the conformation of the protonated di-(i-propyl)amine changed little during the crystallization. The present study showed that the composition of the liquid phase is critical to the formation of a specific structure. (C) 2011 Elsevier Inc. All rights reserved.
关键词[WOS]: DRY-GEL CONVERSION ;  SOLID-STATE NMR ;  SIEVE SYNTHESIS ;  P-31 ;  SPECTROSCOPY ;  PHOSPHATES ;  MECHANISM ;  HYDRATION ;  ZEOLITES ;  ALUMINUM
语种: 英语
WOS记录号: WOS:000295906200028
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/143114
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.Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China
2.Chinese Acad Sci, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan Inst Phys & Math, Wuhan 430071, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Zhang, Bin,Xu, Jun,Fan, Fengtao,et al. Molecular engineering of microporous crystals: (III) The influence of water content on the crystallization of microporous aluminophosphate AlPO4-11[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2012,147(1):212-221.
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