In this study, the catalytic (co-)pyrolysis of low-density polyethylene (LDPE) and polyethylene terephthalate (PET) with HZSM-5 and HY zeolite catalysts was conducted in a micro-pyrolysis reactor coupled to a two-dimensional gas chromatography system. Pyrolysis operating conditions, such as the pyrolysis temperature, the catalyst to feedstock (CF) ratio, and the LDPE:PET ratio, were varied. It was found that for the co-pyrolysis of LDPE and PET, HZSM-5 led to higher yields of C2-C4 olefins and monoaromatic products. Lower CF ratios increased the yield of C2-C4 olefins for LDPE pyrolysis, but decreased benzene yield for PET pyrolysis, concomitant with an increased yield in benzoic acid. A lower temperature of 400°C which was sufficient for the pyrolysis of LDPE, led to incomplete conversion of PET. Surface response diagrams were used to visualize the impact of the various pyrolysis operating conditions on the yield of C2-C4 olefins and BTEX, which serve as target products for the circular economy.

中文翻译：

---

热解操作条件对沸石催化剂催化共热解低密度聚乙烯和聚对苯二甲酸乙二醇酯的影响


在本研究中，在与二维气相色谱系统耦合的微型热解反应器中，使用 HZSM-5 和 HY 沸石催化剂催化（共）热解低密度聚乙烯 (LDPE) 和聚对苯二甲酸乙二醇酯 (PET) 。热解操作条件，例如热解温度、催化剂与原料 (CF) 的比率以及 LDPE:PET 比率是不同的。研究发现，对于 LDPE 和 PET 的共热解，HZSM-5 可以提高 C2-C4 烯烃和单芳烃产品的产率。较低的CF比率增加了LDPE热解的C2-C4烯烃的产率，但降低了PET热解的苯产率，同时苯甲酸的产率增加。 400°C 的较低温度足以热解 LDPE，但导致 PET 转化不完全。表面响应图用于可视化各种热解操作条件对 C2-C4 烯烃和 BTEX 产量的影响，它们是循环经济的目标产品。