| Abstrakt: |
In this work, the fossil fuel-based thermoplastics, i.e., low-density polyethylene (LDPE), polypropylene (PP), and polystyrene (PS) were pyrolyzed at 450 °C, 500 °C, and 550 °C thermally and catalytically to enhance the oil yield and further enrichment via fractionation. In the catalytic process, spent FCC (sFCC) and low-cost BaCO3 with 10 wt% loading were used in a semi-batch quartz reactor. Thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG) were carried out at 10 °C/min for LDPE, PP, and PS to analyze the degradation behavior. Among the used catalysts, the sFCC gives higher oil yield than BaCO3 under identical conditions. The LDPE oil yield obtained was 55.5% and 35.7% for sFCC and BaCO3, respectively. Similar trends were observed for PP (80.0% and 70.0%) and PS (98.0% and 95.0%). Gas chromatography–mass spectrometry (GC–MS) analysis revealed that product oil composition obtained for sFCC-catalyzed pyrolysis process was majorly in the gasoline range (C6–C12) whereas for BaCO3 enabled pyrolysis in the diesel range (C13–C18). Plausible acid and base-catalyzed reaction mechanism and product formation are discussed for catalytic pyrolysis of PP. Fractionation of pyrolysis oil was performed at 150 °C, 250 °C, and 350 °C and physiochemical properties as well as the visual inspection of resulting fractions were carried out as per ASTM methods. Overall, this work represents the utilization of sFCC and low-cost BaCO3 catalyst to convert plastic waste into promising fuel. [ABSTRACT FROM AUTHOR] |
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