Two-Step Heating Process for the Synthesis of Zeolite Na-Y from Coal Fly Ash

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Hyun-Dong Lee¹  Jae-Kwan Kim¹ 

[1] Power Generation Laboratory, Korea Electric Power Research Institute of Korea Electric Power Corp.

关键词: Fly Ash;    Zeolite Na-Y;    Microwave Heating;    CEC (Cation Exchange Capacity);   

DOI  :  10.1252/jcej.09We182

来源: Maruzen Company Ltd

【 摘 要 】

References(15)Cited-By(1)A Two-step heating process for the crystallization of zeolite Na-Y from coal fly ash is investigated with emphasis on the change in the crystallinity of the synthesized zeolite Na-Y. Most of the Si and Al components are effectively transformed into zeolite Na-Y by the first conventional heating, and then the second microwave heating of synthesis mixture dissolves from coal fly ash, and the maximum crystallinity of zeolite Na-Y obtained is 95%. The first conventional heating also plays an important role in enhancing the nuclei formation that Si and Al in the synthesis mixture reacted to form ring-like structures for combining sodalites, and further to small zeolite Na-Y seeds. The second microwave heating increases the crystallization rates from small zeolite Na-Y nucleis to more zeolite Na-Y crystals. The cation exchange capacity (CEC) of the zeolite Na-Y crystallized by the two step heating process is 139.98 meq/100 g compared to 137.59 meq/100 g for commercial zeolite Na-Y. Test results showed that BET surface area and moisture absorption capacity of zeolite Na-Y synthesized from fly ash is about 839 m2/g and 0.3693 g H2O/g sample, respectively, similar to commercial zeolite Na-Y.

【 授权许可】

Unknown