Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 349, Issue -, Pages 18-26Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.01.004
Keywords
Coal fly ash; ZSM-5 zeolite; Crystallization curve; Regulation of crystal growth; Steric-hindrance agent
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Funding
- Program for National Natural Science Foundation of China [51674089]
- Postdoctoral Scientific Research Development Fund of Heilongjiang Province [LBH-Q16037]
- Postgraduate Innovative Research Projects of Northeast Petroleum University [YJSCX2017-014NEPU, YJSCX2015-022NEPU]
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A novel approach was proposed to prepare ZSM-5 zeolite via hydrothermal synthesis by using Al(OH)(3), which was extracted from fly ash by a staged treatment, as an aluminum source. The synthesis parameters and crystal growth of ZSM-5 were optimized. The optimization of crystal growth for ZSM-5 was investigated under the effect of organic steric-hindrance agents. The crystal phase and morphology of the ZSM-5 were characterized by X-ray diffractometry and scanning electron microscopy, and the particle size distribution was measured by laser particle-size analyzer. The crystal growth of ZSM-5 under different hydrothermal conditions obeyed the S regulation. According to the analysis, the formation of ZSM-5 crystal occurred via four steps: (1) the formation of amorphous aluminosilicate by the condensation of silicate ions and aluminate ions; (2) the particle growth and aggregation of the amorphous aluminosilicate; (3) crystallization and crystal growth of ZSM-5; (4) Gentle growth after the zeolite crystal reaches a certain size. The addition of organic steric hindrance agents resulted in a decrease in grain size and crystal-particle formation with a narrow size distribution. Single-grain dispersion resulted and the micropore volume, mesopore volume, and specific surface areas were improved by the presence of organic steric agents. (C) 2018 Elsevier B.V. All rights reserved.
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