Formation of linde F zeolite by KOH treatment of coal fly ash
نویسندگان
چکیده
Zeolitic products formed by hydrothermal treatment of coal fly ash (FA) with KOH aqueous solution under various reaction conditions were examined. Only linde F-type zeolite (K2Al2Si2O8·3H2O) was newly formed at atmospheric pressure, except formation of a small amount of kalsilite (KAlSiO4) at longer reaction time. The yield of the linde F zeolite was highest when reaction time, temperature, KOH concentration and (KOH solution / FA) ratio were 48 h, 95°C, 8 mol dm and 25 ml g, respectively. In this case, the original FA spheres were almost completely dissolved out, and regular prisms of the linde F zeolite crystal with 0.5 to 1 μ m in width and 1 to a few μ m in length were formed. The specific surface area and cation exchange capacity of the FA-derived linde F zeolite were 20.2 m g and 2.3 meq g, respectively. ©2009 The Ceramic Society of Japan. All rights reserved.
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