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Waste Management & Research
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Waste plastics: lignite mixtures co-liquefaction over Si/Al catalysts

Kostas Gimouhopoulos

Department of Chemical Engineering, National Technical University of Athens, Zografou Campus, 157 80 Greece

Danae Doulia

Department of Chemical Engineering, National Technical University of Athens, Zografou Campus, 157 80 Greece

Apostolos Vlyssides

Department of Chemical Engineering, National Technical University of Athens, Zografou Campus, 157 80 Greece

Dimitri Georgiou

Department of Chemical Engineering and Applied Chemistry, University of Toronto, Ontario, Canada

The results of an investigation of the conversion of lignite and post-consumer polymers into liquid products are reported in this paper. At first, a series of silica-alumina acidic catalysts were prepared by sol-gel chemistry with different Si/Al compositions and the catalysts ratio of Bronsted to Lewis acid sites was determined. Then thermal and catalytic col-iquefactions were attempted on 1/1 mixtures of lignite and waste plastics, e.g., PS, PISO and PE. It was found that the catalysts prepared enhanced oil formation in all cases although lignite and polymeric materials demonstrated a variety of catalytic characteristics. Thermal and catalytic reactions of polystyrene (PS) and polyisoprene (PISO) showed that both polymers were liquefied easily at 420°C while polyethylene (PE) did not interact promptly under the same conditions. The conversion of the solid materials correlated with the concentration of Bronsted acidity on the catalysts employed.

Key Words: Bronsted • Lewis acidity • catalysts • col iquefaction • lignite • waste plastics

Waste Management & Research, Vol. 17, No. 3, 181-185 (1999)
DOI: 10.1177/0734242X9901700303
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