The effect of catalyst structure, acidity, and Ga addition of zeolites on the pyrolysis of polypropylene (PP) was investigated by comparing PP cracking efficiency and product distribution properties in this study. Thermogravimetric analysis result indicated that HY(SiO₂/Al₂O₃; 30) is the most effective catalyst lowering PP decomposition temperature, followed by Ga/HZSM-5(30), HZSM-5(30), HZSM-5(80), and HZSM-5(280). Meanwhile, Ga/HZSM-5(30) revealed the lowest apparent activation energy (Ea), 110 kJ/mol, than HY(30) (159 kJ/mol), and other HZSM-5 catalysts (122 ~ 172 kJ/mol), suggesting its high efficiency lowering Ea on PP pyrolysis. Py-GC/MS results also suggested that Ga/HZSM-5 produces the largest amount of aromatic hydrocarbons, followed by HZSM-5(30), HZSM-5(80), HY(30), and HZSM-5(280). The increase of Ga/HZSM-5(30) amount on PP pyrolysis led the further decrease of Ea value and increase of aromatics production efficiency.

本研究通过比较PP裂解效率和产物分布特性，研究了催化剂结构、酸度和沸石Ga添加量对聚丙烯（PP）热解的影响。热重分析结果表明，HY(SiO ₂ /Al ₂ O ₃; 30) 是降低 PP 分解温度最有效的催化剂，其次是 Ga/HZSM-5(30)、HZSM-5(30)、HZSM-5(80) 和 HZSM-5(280)。同时，Ga/HZSM-5(30) 的表观活化能 (Ea) 最低，为 110 kJ/mol，高于 HY(30) (159 kJ/mol) 和其他 HZSM-5 催化剂 (122 ~ 172 kJ/mol) )，表明其高效地降低了 PP 热解的 Ea。Py-GC/MS 结果还表明 Ga/HZSM-5 产生的芳烃量最大，其次是 HZSM-5(30)、HZSM-5(80)、HY(30) 和 HZSM-5(280) . PP热解中Ga/HZSM-5(30)用量的增加导致Ea值的进一步降低和芳烃生产效率的提高。