Abstract

Pyrolysis is a promising technology for the valorisation of plastic waste by converting it into valuable products, such as fuels and chemicals. This study aims to assess the thermogravimetric behaviour and kinetic parameters of the real-world plastic waste mixture with added nickel- and iron-based catalysts on gamma-aluminium oxide as support. Thermogravimetric measurements were carried out in a nitrogen atmosphere over a set of heating rates (5, 10, 15 and 20 °C/min) within a temperature range 40–600 °C. Kinetic analysis was performed through a combined approach by using the model-free isoconversional Friedman method and regression methods (linear and multivariate nonlinear). The kinetic analysis results showed a complex decomposition mechanism of the real-world plastic waste mixture. The average apparent activation energy for the real-world plastic waste mixture (22% high-density polyethylene, 31% low-density polyethylene, 35% polypropylene, 12% polystyrene) was 205 kJ/mol. The initial value decreased by 15.6% with the addition of iron-based gamma-aluminium oxide catalyst and only 9.8% with nickel-based gamma-aluminium oxide catalyst.

Graphic abstract

中文翻译：

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混合废塑料的催化分解和动力学研究

摘要

通过将塑料废物转化为有价值的产品（例如燃料和化学品），热解技术是一种用于增值塑料废物的有前途的技术。这项研究旨在评估在添加有以镍-氧化铝为载体的镍和铁基催化剂的情况下，现实世界中塑料废物混合物的热重行为和动力学参数。热重测量是在氮气气氛中，在40–600°C的温度范围内以一组加热速率（5、10、15和20°C / min）进行的。通过使用无模型的等转换弗里德曼方法和回归方法（线性和多元非线性）通过组合方法进行动力学分析。动力学分析结果表明，现实世界的塑料废料混合物分解机理复杂。实际的塑料废料混合物（22％高密度聚乙烯，31％低密度聚乙烯，35％聚丙烯，12％聚苯乙烯）的平均表观活化能为205 kJ / mol。添加铁基γ-氧化铝催化剂的初始值降低了15.6％，而镍基γ-氧化铝催化剂的初始值仅降低了9.8％。

图形摘要