Comparison of waste plastics pyrolysis under nitrogen and carbon dioxide atmospheres: A thermogravimetric and kinetic study
Comparison of waste plastics pyrolysis under nitrogen and carbon dioxide atmospheres: A thermogravimetric and kinetic study
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DOI：
10.1016/j.jaap.2021.105135
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发表时间：
2021-05-06
影响因子：
6
通讯作者：
Zhou, Hui
中科院分区：
文献类型：
--
作者：
Saad, Juniza Md.;Williams, Paul T.;Zhou, Hui
了解热解气氛对废塑料热降解的影响具有重要意义。在这项研究中，废塑料的分解;高密度和低密度聚乙烯，聚丙烯，聚苯乙烯，和聚对苯二甲酸乙二醇酯进行了研究，从环境温度到500摄氏度内的氮气或二氧化碳气氛。研究了3个不同垃圾处理厂的塑料单体和混合塑料（家用包装、建筑和农业废弃塑料）在N2、CO2和N2/CO2气氛下的热降解特性和动力学参数。在所有大气中，在250-510 ℃之间仅观察到一个降解峰温度。CO2替代N2-对反应活化能有不同的影响。在热解气氛中的N-2/CO2的混合物导致所有塑料样品的活化能较低，除了高密度聚乙烯，聚苯乙烯和聚对苯二甲酸乙二醇酯。较低的活化能表明降解过程所需的能量较低。然而，超过30%的CO2的混合物可能会影响塑料的降解过程，因为实验后获得的残留物值较高。
It is important to understand the influence of pyrolysis atmosphere on the thermal degradation of waste plastics. In this study, the decomposition of waste plastics; high and low density polyethylene, polypropylene, polystyrene, and polyethylene terephthalate were investigated from ambient temperature to 500 degrees C within nitrogen or carbon dioxide atmospheres. The thermal degradation characteristics and kinetic parameters of individual plastics and mixed plastics (household packaging, building construction and agricultural waste plastics) from three different waste treatment plants were investigated under N-2, CO2 and N-2/CO2 atmospheres. In all atmospheres, only one degradation peak temperature was observed between 250-510 degrees C. The replacement of N-2 by CO2 showed different effects on the activation energy. Mixtures of N-2/CO2 in the pyrolysis atmosphere resulted to lower activation energy for all plastic samples, with the exception of high density polyethylene, polystyrene and polyethylene terephthalate. The lower activation energy suggested that lower energy was required for the degradation process. However, a mixture of more than 30 % of CO2 may influence the degradation process of plastics due to a higher value of residue obtained after the experiment.