Synthesis of kaolin-based zeolite NaA and its crystallization mechanism

doi:10.1088/2053-1591/ab463b

	Synthesis of kaolin-based zeolite NaA and its crystallization mechanism
	Wang, Peng 1; Sun, Qi 1; Zhang, Yujiao 2; Cao, Jun 1
	2019-09
发表期刊	MATERIALS RESEARCH EXPRESS
ISSN	2053-1591
卷号	6 期号:11
摘要	The zeolite NaA was successfully synthesized by hydrothermal method using kaolin as a raw material. In order to study the crystallization mechanism, the products and intermediates of different crystallization stages were systematically characterized using x-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM)-energy-dispersive spectrometry (EDS). The results show that the metakaolin is completely dissolved during the first hour of the crystallization process, forming a rich crystal nucleus. As the crystallization time increases, the nucleus grows rapidly to form zeolite NaA crystals. When the crystallization time reaches 3 h, the percentage crystallinity of zeolite NaA reaches a maximum. Therefore, it can be concluded that the optimum crystallization time of zeolite NaA is 3 h. Meanwhile, we can come to the conclusion that the synthesis of zeolite NaA from kaolin is a liquid phase transition mechanism. The microstructure of zeolite NaA synthesized at 3 h of crystallization was further investigated by transmission electron microscopy (TEM) technique. The SAED patterns indicate the polycrystallinity of the zeolite NaA structure. The electron diffraction pattern indicates that the crystal structure type of the zeolite NaA belongs to the body center cube (BCC). The textural properties of the zeolite NaA synthesized at 3 h of crystallization were studied by nitrogen adsorption technique. It can be concluded that the BET surface area of the zeolite NaA obtained by the BET method is 21.106 m(2).g(-1). Meanwhile, from the BJH method, it is found that the microporous surface area and micropore volume of the zeolite NaA are 13.929 m(2).g(-1) and 0.052 cm(3).g(-1), respectively.
关键词	kaolin zeolite NaA crystallization mechanism polycrystallinity body center cube
DOI	10.1088/2053-1591/ab463b
收录类别	SCI ; SCIE
语种	英语
资助项目	Guizhou Science and Technology Plan Project[7247]
WOS研究方向	Materials Science
WOS类目	Materials Science, Multidisciplinary
WOS记录号	WOS:000488098800001
出版者	IOP PUBLISHING LTD
EI入藏号	20194307589516
EI主题词	Zeolites
EI分类号	482.2 Minerals - 741.3 Optical Devices and Systems - 801 Chemistry - 802.3 Chemical Operations - 804.2 Inorganic Compounds - 931.2 Physical Properties of Gases, Liquids and Solids - 933.1.1 Crystal Lattice
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://ir.lut.edu.cn/handle/2XXMBERH/31605
专题	兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室
通讯作者	Sun, Qi
作者单位	1.Guizhou Univ, Coll Mat & Met, Guiyang 550025, Guizhou, Peoples R China; 2.Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Peng,Sun, Qi,Zhang, Yujiao,et al. Synthesis of kaolin-based zeolite NaA and its crystallization mechanism[J]. MATERIALS RESEARCH EXPRESS,2019,6(11).
APA	Wang, Peng,Sun, Qi,Zhang, Yujiao,&Cao, Jun.(2019).Synthesis of kaolin-based zeolite NaA and its crystallization mechanism.MATERIALS RESEARCH EXPRESS,6(11).
MLA	Wang, Peng,et al."Synthesis of kaolin-based zeolite NaA and its crystallization mechanism".MATERIALS RESEARCH EXPRESS 6.11(2019).