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Synthesis of Low-Priced Catalyst from Coal Fly Ash for Pyrolysis of Waste Low Density Polyethylene  

Jeong, Byung-Hwan (Energy Conversion Research Department, Korea Institute of Energy Research)
Na, Jeong-Geol (Energy Conversion Research Department, Korea Institute of Energy Research)
Kim, Sang-Guk (Energy Conversion Research Department, Korea Institute of Energy Research)
Mo, Se-Young (Department of Environmental Engineering, Chungbuk National University)
Chung, Soo-Hyun (Energy Conversion Research Department, Korea Institute of Energy Research)
Publication Information
Resources Recycling / v.16, no.2, 2007 , pp. 48-55 More about this Journal
Abstract
A low-priced catalyst for pyrolysis of LDPE has been synthesized. Fly ash, which is waste material generated from coal-fired power plants was used as silica and alumna sources for solid acid catalyst. Amorphous silica-alumina catalysts (FSAs) were pre-pared by dissolution of silica and alumina from fly ash, followed by co-precipitation of the dissoluted ions. A series of LDPE pyrolysis were carried out in a thermogravimetric analyzer to investigate the effects of synthesis conditions such as NaOH/fly ash weight ratio and activation time one catalytic performance of FSAs. The physical properties of FSAs were examined and related to their catalytic performances. FSA(1.2-8) synthesized with NaOH/fly ash weight ratio of 1.2 and the activation time of 8 hours showed the best catalytic performance. The catalytic performance of FSA(1.2-8) was comparable with that of commercial catalysts and it was concluded that the FSA could be a good candidate for catalytic use in the recycling of waste polyolefins.
Keywords
coal fly ash-derived catalyst; NaOH fusion; catalytic pyrolysis; low density polyethylene;
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