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题名: Insights into the aminothermal crystallization process of SAPO-34 and its comparison with hydrothermal system
作者: Gao, Beibei1, 2;  Fan, Dong1, 2;  Sun, Lijing1, 2;  An, Hongyu3;  Fan, Fengtao3;  Xu, Shutao1;  Tian, Peng1;  Liu, Zhongmin1
关键词: Molecular sieves ;  SAPO-34 ;  Crystallization ;  Aminothermal synthesis ;  Characterization
刊名: MICROPOROUS AND MESOPOROUS MATERIALS
发表日期: 2017-08-01
DOI: 10.1016/j.micromeso.2017.04.035
卷: 248, 页:204-213
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: Aminothermal synthesis reported by our group recently, in which organic amine is used as the solvent and template, could obviously enhance the solid yield and crystallization rate of SAPO-34 as compared with the corresponding hydrothermal one. Herein, aminothermal crystallization process of SAPO-34 is investigated to gain insights into this novel synthetic method by XRD, SEM, IR, UV-Raman and various solid-state NMR techniques. It is found that aminothermal environment facilitates the fast formation of a semicrystalline AIPO layered phase, which further promotes the quick activation of Al source. The lamellar phase, which is water-soluble and contains double 6-rings in the framework, could be stabilized by protonated triethylamine (TEA(+)). SAPO-34 nucleates from the rearrangement of the double 6-rings in the layered phase through bond breaking, reforming and Si incorporation after heating at 160 degrees C for 3 h. For the hydrothermal process, the interaction between TEA(+) and inorganic species is weak and the formation of layered phase is retarded due to its high solubility in water. Correspondingly, the activation of Al source is slow and SAPO-34 appears after 24 h. This work demonstrates the importance of water concentration in the synthetic system, which may influence the formation of intermediate species and alter the crystallization process and rate. (C) 2017 Elsevier Inc. All rights reserved.
关键词[WOS]: SILICOALUMINOPHOSPHATE MOLECULAR-SIEVES ;  DRY-GEL CONVERSION ;  CATALYTIC-ACTIVITY ;  TEMPLATING AGENT ;  SI DISTRIBUTION ;  METHANOL ;  ZEOLITE ;  PERFORMANCE ;  MECHANISM ;  NMR
语种: 英语
WOS记录号: WOS:000402497200024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/152200
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, iChEM Collaborat Innovat Ctr Chem Energy Mat, Natl Engn Lab Methanol Olefins,Dalian Natl Lab Cl, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Gao, Beibei,Fan, Dong,Sun, Lijing,et al. Insights into the aminothermal crystallization process of SAPO-34 and its comparison with hydrothermal system[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2017,248:204-213.
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