Mechanism on solvent-free crystallization of NaA zeolite

doi:10.1016/j.micromeso.2016.09.029

	Mechanism on solvent-free crystallization of NaA zeolite
	Meng, Xiangju 2; Xiao, Yuchen 2; Sheng, Na 2; Chu, Yueying 3; Wang, Yeqing 2; Wu, Qinming 2; Liu, Xiaolong 3; Deng, Feng 3; Feng, Zhaochi 1
刊名	MICROPOROUS AND MESOPOROUS MATERIALS
	2017
卷号	237 页码:201-209
关键词	Naa Crystallization D4r Al-27 2d Mqmas Nmr Technique Uv-raman
ISSN号	1387-1811
DOI	10.1016/j.micromeso.2016.09.029
文献子类	Article
英文摘要	It is of great importance to deeply understand the crystallization mechanism of zeolite in both fundamental research and industrial applications. Here we have systemically investigated the crystallization of zeolite NaA using hydrated silica (SiO2 center dot 3H(2)O) and sodium aluminate solids in the absence of water solvent, which is well characterized by X-ray diffraction (XRD), scanning electron micrography (SEM), UV-Raman, and Al-27 MQMAS and Si-29 MAS NMR techniques. The XRD patterns show that the complete crystallization requires for 5 h at 80 degrees C. The SEM images suggest that the nucleation mainly occurs on the surface of solid particles. The UV-Raman spectra exhibit that a large amount of the zeolite building units of four-membered rings (4R) formed in the starting solid particles, which even occurs before the crystallization, while crystal growth is always along with the formation of zeolite building units of six membered rings (6R). The Al-27 2DMQMAS NMR spectra show that the D4R species are dominant in the precursors for crystallization of NaA. According to these results, we believe that the rearrangement of zeolite building units such as aluminosilicate D4R plays a critical role for the crystallization of zeolite NaA in the absence of water solvent. (C) 2016 Elsevier Inc. All rights reserved.
WOS关键词	SOLID-STATE NMR ; ALUMINOPHOSPHATE MOLECULAR-SIEVES ; ATOMIC-FORCE MICROSCOPY ; LEWIS-ACID CATALYSTS ; DRY-GEL CONVERSION ; LTA ZEOLITE ; HYDROTHERMAL SYNTHESIS ; CRYSTAL-GROWTH ; MAS-NMR ; NUCLEATION
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000387836100022
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/169710]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Meng, Xiangju; Feng, Zhaochi
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China 2.Zhejiang Univ, Dept Chem, Hangzhou 310028, Zhejiang, Peoples R China 3.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Meng, Xiangju,Xiao, Yuchen,Sheng, Na,et al. Mechanism on solvent-free crystallization of NaA zeolite[J]. MICROPOROUS AND MESOPOROUS MATERIALS,2017,237:201-209.
APA	Meng, Xiangju.,Xiao, Yuchen.,Sheng, Na.,Chu, Yueying.,Wang, Yeqing.,...&Feng, Zhaochi.(2017).Mechanism on solvent-free crystallization of NaA zeolite.MICROPOROUS AND MESOPOROUS MATERIALS,237,201-209.
MLA	Meng, Xiangju,et al."Mechanism on solvent-free crystallization of NaA zeolite".MICROPOROUS AND MESOPOROUS MATERIALS 237(2017):201-209.