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폐FCC 촉매에서 폐농업용 필름의 액상 분해반응
Liquid-Phase Degradation of Waste Agricultural Film over Used-FCC Catalysts
전남대학교 응용화학공학부, 500-757 광주시 북구 용봉동 300 1(주)제오빌더, 570-330 전북 익산시 석암동 635-2
Department of Applied Chemistry, Chonnam National University, 300, Yongbong-dong, Buk-gu, Gwangju 500-757, Korea 1Zeobuilder Co. Ltd., 635-2, Seokam-dong, Iksan, Jeonbuk 570-330, Korea
gseo@chonnam.ac.kr
HWAHAK KONGHAK, December 2003, 41(6), 694-699(6), NONE
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Abstract
염산과 수산화나트륨 용액으로 폐FCC 촉매를 처리하면 물리화학적 성질과 폐농업용 필름의 액상 분해반응에서 촉매 활성이 크게 달라진다. 산으로 처리하면 FCC 촉매에 들어있는 제올라이트의 구조가 유지되면서 무정형 물질이 제거되어 표면적이 넓어지나, 알칼리로 처리하면 제올라이트의 구조가 부서져서 표면적이 도리어 작아진다. 폐FCC 촉매를 약한 산이나 알칼리로 처리하면 분해반응에서 촉매 활성이 높아졌으며, 그 중에서도 1.0 N 염산으로 처리할 때 활성이 가장 많이 높았다. 폐FCC 촉매는 산 처리하여도 MFI와 USY 제올라이트에 비해 활성은 낮지만, 저렴하므로 많이 사용할 수 있어서 폐농업용 비닐의 액상 분해반응에 촉매로 적용 가능성이 높았다.
The treatment of used-FCC catalysts with hydrochloric and sodium hydroxide solutions brought about significant changes in their physico-chemical properties and catalytic activities in the liquid-phase degradation of waste agricultural film. Acid treatment enlarged the surface area of used-FCC catalyst by removing amorphous material with maintaining its zeolite structure, while alkali treatment destroyed the zeolite structure, resulting in a small surface area. The treatments with acid and alkaline solutions of low concentrations enhanced their catalytic activities. Among the acid and alkali treated used-FCC catalysts, the catalyst treated with 1.0 N hydrochloric acid showed a considerably high activity. The activities of the acid treated used-FCC catalysts were still low compared with those of MFI and USY catalysts. Similar levels of the conversion, however, could be obtained by increasing the loading level of acid treated used-FCC catalysts, suggesting its application to commercial catalytic degradation of waste agricultural film because of their low cost.
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