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http://dx.doi.org/10.5338/KJEA.2005.24.3.232

Synthesis of Highly Pure Na-P1 Zeolite by NaOH Fusion Treatment of Fly Ash  

Choi, Choong-Lyeal (Institute of Agricultural Science & Technology, Kyungpook National University)
Lee, Dong-Hoon (Department of Agricultural Chemistry, Kyungpook National University)
Lee, In-Jung (Department of Agronomy, Kyungpook National University)
Shin, Dong-Hyun (Department of Agronomy, Kyungpook National University)
Kim, Jang-Eok (Department of Agricultural Chemistry, Kyungpook National University)
Park, Man (Department of Agricultural Chemistry, Kyungpook National University)
Publication Information
Korean Journal of Environmental Agriculture / v.24, no.3, 2005 , pp. 232-237 More about this Journal
Abstract
This study was conducted to elucidate the effects of NaOH fusion treatment on Na-P1 zeolite synthesis from fly ash and to evaluate its optimal condition. NaOH fusion treatment of fly ash led to Na-P1 zeolite with shorter reaction time and higher quality compared that of simple hydrothermal method. Mixed zeolite phases of Na-P1 and hydroxy sodalite were formed by the fusion treatment below $450^{\circ}C$, whereas only Na-P1 zeolite was formed above $550^{\circ}C$. Ratio of NaOH/fly ash, reaction times, fusion temperature and solid/liquid ratio strongly affected the kind and crystallinity of the zeolite formed. The CEC of Na-P1 zeolite formed at the optimum reaction conditions of NaOH/fly ash ratio 0.9 and solid/liquid ratio $1/5.0{\sim}1/7.5$ after NaOH fusion treatment at $550^{\circ}C$ for 2 hours was about $398cmol^+kg^{-1}$ which was 40% higher than those of control products. Therefore, it is clear that NaOH fusion treatment of fly ash in open system could lead to Na-P1 zeolite with high purity.
Keywords
Fly ash; Na-P1 zeolite; Hydrothermal; CEC; Crystallinity;
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