红辉沸石两步水热法合成A型分子筛机理研究

doi:10.19964/j.issn.1006-4990.2022-0436

Abstract

Abstract:

Stellerite zeolite was used as raw material to convert into zeolite A by the two-step hydrothermal method，and the conversion mechanism of zeolite A was systematically investigated.The samples with different crystallization times were systematically characterized.The basic structural problems such as the nucleation mechanism，growth control and stable conversion of crystal form of natural stellerite zeolite into zeolite A were analyzed in depth.The results indicated that the growth process of zeolite A could be divided into three stages.When it was in the nucleation induction stage（crystallition time≤0.5 h），the β cages in gel was constructed by double four-membered rings to form α cages and many crystal nuclei and a few 1 μm small crystal were formed.When it was in the rapid growth（crystallition time of 1~4 h），a large number of nuclei were grown by aggregation to form large crystals with 2 μm.Finally，when it was in the stable growth（crystallition time of 5~8 h），the gel was converted into more zeolite crystals by secondary nucleation.The formation of zeolite A was followed：aluminosilicate gel→four-membered rings and six-membered rings→double four-membered rings and β cages→α cages.Therefore，the process of stellerite zeolite conversion to zeolite A was belonged to a liquid phase conversion mechanism.

Key words: stellerite zeolite, zeolite A, two-step hydrothermal method, conversion mechanism

CLC Number:

TQ426.95

PEI Yinchang,MO Shengpeng,XIE Qinglin,CHEN Nanchun. Study on mechanism of zeolite A synthesized from stellerite zeolite by two-step hydrothermal method[J]. Inorganic Chemicals Industry, 2022, 54(11): 59-64.

Figures/Tables 7

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时间/h	w（SiO₂）%	w（Al₂O₃）%	w（Na₂O）%
0.5	48.50	32.50	18.49
1	48.36	32.95	18.56
2	48.08	32.99	18.81
3	47.39	33.30	19.20
4	47.05	33.81	19.00

时间/h	m（SiO₂）/g	m（Al₂O₃）/g	m（Na₂O）/g
0.5	0.054 2	0.082 6	1.841 1
1.0	0.037 7	0.028 8	1.742 6
2.0	0.031 8	0.019 7	1.650 7
3.0	0.025 2	0.024 7	1.533 3
4.0	0.029 9	0.020 1	1.637 2

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on mechanism of zeolite A synthesized from stellerite zeolite by two-step hydrothermal method

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