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题名: Synthesis of SAPO-34 templated by diethylamine: Crystallization process and Si distribution in the crystals
作者: Liu, Guangyu1, 2;  Tian, Peng1;  Zhang, Ying1, 2;  Li, Jinzhe1, 2;  Xu, Lei1;  Meng, Shuanghe1;  Liu, Zhongmin1
通讯作者: 刘中民
关键词: SAPO-34 ;  diethylamine ;  characterization ;  crystallization mechanism ;  Si distribution
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2008-09-01
DOI: 10.1016/j.micromeso.2008.01.030
卷: 114, 期:1-3, 页:416-423
收录类别: SCI
文章类型: Article
部门归属: 8
项目归属: 803
产权排名: 1;1
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 crystallization process of SAPO-34 molecular sieve with Si distribution in the crystals using diethylamine (DEA) as the template was investigated by XRD, SEM, IR, NMR, XRF, XPS and EDS techniques. It was found that the solution-mediated transport mechanism occurred during the crystallization, though the gel transformation cannot be completely excluded in the initial crystallization (t <= 1 h). Si directly participated in the crystallization in the initial stage and incorporated into the framework of SAPO-34 by SM2 (P substitution by Si) and SM3 (pairs of Al and P substitution by 2Si) mechanisms. XPS analysis revealed the enrichment of Si on the surface of crystals. Based on the experimental results, a model of Si distribution in the crystals was proposed, which described a non-uniform distribution of Si in the crystals, with the increasing content from the core to the surface. (C) 2008 Elsevier Inc. All rights reserved.
关键词[WOS]: METHANOL-TO-HYDROCARBONS ;  MOLECULAR-SIEVES ;  SILICON INCORPORATION ;  OLEFIN CONVERSION ;  LIGHT OLEFINS ;  NMR ;  MECHANISMS ;  MORPHOLINE ;  STABILITY ;  ZEOLITES
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000258432100042
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/100631
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, Lab Appl Catalysis, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

Recommended Citation:
Liu, Guangyu,Tian, Peng,Zhang, Ying,et al. Synthesis of SAPO-34 templated by diethylamine: Crystallization process and Si distribution in the crystals[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2008,114(1-3):416-423.
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