Kinetic studies on the catalyzed and un-catalyzed pyrolysis of mixed HDPE and PP (75:25 wt%) plastic waste using a combination of model-fitting and model-free methods | ||||
| Journal of Basic and Environmental Sciences | ||||
| Volume 11, Issue 4, October 2024, Page 417-436 PDF (1.63 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jbes.2024.391263 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| D.M. Fathy* ; E.M. Kamar; M Hanafy; M.A. Mousa | ||||
| Chemistry Department, Faculty of Science, Benha University, Benha, Egypt. | ||||
| Abstract | ||||
| This study investigates the catalyzed and un-catalyzed pyrolysis kinetics of waste samples composed of a commercial mixture of high-density polyethylene (HDPE) and polypropylene (75:25 wt%). The reaction mechanism and kinetic compensation effects were examined. Thermal analysis was conducted at various heating rates (β = 2–20°C/min) in an inert atmosphere using thermogravimetric analysis (TGA). Four methods—Friedman (FR), Ozawa-Flynn-Wall (OFW), Kissinger-Akahira-Sunose (KAS), and Starink (ST)—were employed to evaluate the kinetic parameters, including the pre-exponential factor and activation energy. Additionally, five model-fitting methods (Coats-Redfern, master plots, and iteration methods) were used to establish the kinetic model. The conversion function for random scission processes, f(R), is proposed to accommodate degradation mechanisms. The addition of a 10 wt% Zeolite A catalyst significantly reduced the activation energy required for the degradation of the waste mixture. | ||||
| Keywords | ||||
| Mixed Plastic; Kinetic model; Random Scission; Pyrolysis; catalysis | ||||
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