研究旨在利用新型自制催化剂替代传统催化剂，提高对苯二甲酸的降解率和对苯二甲酸二甲酯的收率，从而改进聚对苯二甲酸乙二酯（PET）的回收工艺。采用控制变量法，固定PET用量为2.5 g，控制甲醇的添加量为PET的3倍，自制催化剂的添加量为PET添加量的0.2%［n（自制催化剂）∶n（PET瓶片）∶n（甲醇）为1∶12∶39］，在水热反应釜中，将温度控制在180 ℃，反应时间为60 min。结果表明：在所设定的条件下，PET的降解率达到89.99%，对苯二甲酸二甲酯的收率达到92%。与传统催化剂相比，新型自制催化剂提高产率的效果较好。采用新型自制催化剂可以显著提高PET的降解率和对苯二甲酸二甲酯的收率，为PET的再生利用提供一种有效的方法。新型催化剂在PET再生利用过程中的应用前景广泛。

The aim of the study is to employ a novel homemade catalyst as a substitute for traditional catalysts, aiming to enhance the degradation rate of phthalic acid and the yield of dimethyl phthalate, thereby improving the recycling process of polyethylene terephthalate (PET). The controlled variable method is utilized, with a fixed amount of PET set at 2.5 g. Methanol is added at three times the amount of PET, while the homemade catalyst is added at 0.2% of the PET amount [n(homemade catalyst)∶n(PET bottle chips)∶n(methanol) is 1∶12∶39]. The reaction is carried out in a hydrothermal reactor at a controlled temperature of 180 ℃ for a duration of 60 min. The results demonstrate that under the specified conditions, the degradation rate of PET reaches 89.99%, and the yield of dimethyl phthalate attains 92%. In comparison with traditional catalysts, the novel homemade catalyst exhibits a considerable improvement in productivity. The adoption of the novel homemade catalyst significantly enhances both the degradation rate of PET and the yield of dimethyl phthalate, providing an effective approach for the recycling of PET. The application prospects of the novel catalysts in PET recycling process are broad.