Abstract The effect of pre-degradation treatment in catalytic pyrolysis of polymer was assessed using thermogravimetric analysis (TGA) and pyrolysis reactor experiments of different polymers on various catalysts. Intimate contact between the polymer and catalyst was achieved using physical, mechanical and thermal treatments. The results from the TGA analysis show that pre-degradation treatment has greatly improved the performance of the catalyst attaining maximum degradation at lower temperature. Pre-degradation treatment had increased the liquid yield and lowered the coke yield at various extents depending on the catalyst structure and acidity. The ZSM-5 catalyst with high Si/Al ratio showed maximum amount of (C5–C9) and ZSM-5 with lower Si/Al ratio has maximum percentage of (C14–C20). Based on the performance of the pre-degradation treatment methods, normal mixing produced the maximum amount of lighter fractions and therefore pre-degradation treatment can serve to enhance the gasoline fraction while the diesel fraction can be optimised using the co-pressing method, where polymer and catalyst particles were thoroughly mixed and co-pressed together into mixed particles. Coke characterisation showed coke formed by linear low density polyethylene contained more volatile coke components while polypropylene coke had higher percentage of hard coke. ZSM-5 had lower retention of coke components with volatile coke precursors. The volatility of the coke increases while coke concentration and decreases as the catalyst amount decreases. Pre-degradation treatment facilitated the formation of soft coke components that are easy to remove in inert atmosphere.

中文翻译：

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聚烯烃在酸性沸石催化剂上同时预处理和催化转化为烃燃料

摘要 利用热重分析 (TGA) 和不同聚合物在各种催化剂上的热解反应器实验，评估了预降解处理对聚合物催化热解的影响。聚合物和催化剂之间的紧密接触是通过物理、机械和热处理实现的。TGA 分析结果表明，预降解处理大大提高了催化剂的性能，在较低温度下达到最大降解。预降解处理在不同程度上提高了液体收率，降低了焦炭收率，这取决于催化剂的结构和酸度。具有高 Si/Al 比的 ZSM-5 催化剂显示出最大的 (C5-C9) 量，而具有较低 Si/Al 比的 ZSM-5 具有最大的 (C14-C20) 百分比。基于预降解处理方法的性能，正常混合产生最大量的轻质馏分，因此预降解处理可以用于提高汽油馏分，而柴油馏分可以使用共压法优化，其中聚合物和催化剂颗粒充分混合并一起共压成混合颗粒。焦炭特性表明由线性低密度聚乙烯形成的焦炭含有更多的挥发性焦炭成分，而聚丙烯焦炭具有更高百分比的硬焦炭。ZSM-5 对具有挥发性焦炭前体的焦炭组分的保留率较低。焦炭的挥发性随着焦炭浓度的增加而增加，随着催化剂用量的减少而降低。