ISSN : 1738-4125(Print)
ISSN : 2287-7509(Online)
ISSN : 2287-7509(Online)
이산화탄소 흡착을 위한 폐 비산재의 제올라이트 합성
Synthesis of Zeolite from Waste fly ash for Adsorption of CO₂
Abstract
The conversion of coal fly ash into zeolites contributes to the mitigation of environmental problems andturns this by-product into useful material. In this work, zeolitic sorbents for CO2 adsorption were preparedby waste fly ash from Boryeong coal power plants through the alkali fusion method including hydrothermaltreatment at various ratios of NaOH/FA and NaAlO2/FA. In addition, in order to improve the adsorptioncapacity for CO2 molecules a few metal cations were impregnated into the synthesized zeolitic sorbentsthrough the ion exchange.The fusion step could decompose the fly ash to very small amorphous particulate zeolite forms. The fly ashwas converted into Na-P1 type with 0.5 NaOH/FA and Na-A type from the ratio of 0.53, NaAlO2/FA.Although the crystallinity of Na-A increased with increasing temperature, Na-A was transformed into sodaliteat 140℃. Thus, the optimum reaction temperature was determined to be 100℃.Alkali metal and alkaline earth metal cations were impregnated into the synthesized zeolite Na-P1 and Na-Athrough ion exchanged method. The completed zeolitic sorbents were applied to adsorption the CO2. As aresult of the examination, Ca2+ was found to be the best for CO2 adsorption owing to its electrostaticinteractions and acid-base surface properties.
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