期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 284, 期 -, 页码 476-485出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2019.04.029
关键词
Microwave synthesis; Y-type zeolite; High temperature; Enhancing mechanism
类别
资金
- China Postdoctoral Science Foundation, China [2018M633424]
- first batch of Yunnan Provincial Postdoctoral Research Fund Project, China
- Yunnan Province Post-Doctoral Training Fund, China
- Applied Basic Research Program of Yunnan Province, China
- Kunming University of Science and Technology, China
A rapid microwave heating method is proposed for the liquid phase synthesis of Y-type zeolite under high-temperature conditions. The effect of microwave heating temperatures, crystallization time and silica to alumina ratio on the synthesis of Y-type zeolite is systematically investigated. The synthesized samples are characterized by XRD, SEM, FT-IR, N-2 sorption and particle size analysis. Microwave treatment was found to promote the high-temperature synthesis of Y-type zeolite with the advantages of shorter crystallization time and product properties of the produced Y-type zeolite. Specifically, under the optimized conditions, such as input ratio of Si/Al of 4, microwave heating temperature of 150 degrees C, crystallization time of 0.5 h, pure Y-type zeolite is synthesized with BET specific surface area of 645 m(2)/g and the total pore volume is 0.322 cm(3)/g. The evolution order of zeolites with crystallization temperature is as follows: amorphous phase, Y-type zeolite, and P2 zeolite. An extended crystallization time or increased ratio of Si/Al facilitated the formation of P2 zeolite and analcime-C. The synthesis process promoted by microwave is explained by the high-speed rotation of polar water molecules, the formation of isolated water molecules and the dispersion of initial aluminosilicate gel in the microwave field.
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