使用 Ni-ZnO/Al2O3 催化剂通过超临界乙醇解聚 PET 塑料废料生产单体。

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2024-10-08 DOI:10.1016/j.wasman.2024.10.001

Yayong Yang , Hongyu Sun , Zihao Liu , Haocheng Wang , Rendong Zheng , Ekkachai Kanchanatip , Mi Yan

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引用次数: 0

摘要

塑料废物对全球环境构成严重威胁，其中回收的聚对苯二甲酸乙二酯（PET）塑料占相当大的比例。超临界乙醇解聚技术的应用为回收 PET 废弃物提供了一种有效的方法。本研究探讨了使用 Ni 作为添加剂来提高 ZnO/Al2O3 催化剂在 PET 废料解聚中的催化活性。采用单因素控制变量法研究了不同催化剂、催化剂用量、反应温度和反应时间对 PET 废料解聚的影响。结果表明，3Ni-ZnO/Al2O3 是最佳催化剂，在催化剂用量为 4%、反应温度为 260 ℃、反应时间为 60 分钟的最佳条件下，PET 废料的解聚效率可达 100%，对苯二甲酸二乙酯（DET）和乙二醇（EG）的最高收率分别为 93.6% 和 90.2%。采用响应面法（RSM）对操作条件进行了优化，以获得最高的单体产量。RSM 预测的最佳参数如下：反应温度 = 262.8 °C，反应时间 = 63.2 分钟，催化剂用量 = 3.8 wt%，预测的最高 DET 和 EG 收率分别为 95.9 % 和 90.7 %。DET 和 EG 的方差分析（ANOVA）结果的 R2 值分别为 0.9921 和 0.9885，p 值为 2O3 催化剂仍具有良好的催化活性和稳定性。总之，这项研究为回收塑料废物提供了一种清洁、绿色和可持续的替代方法。

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Monomer production from supercritical ethanol depolymerization of PET plastic waste using Ni-ZnO/Al2O3 catalyst

Plastic waste poses a serious threat to the global environment, with recycled polyethylene terephthalate (PET) plastic accounting for a considerable portion. The application of supercritical ethanol depolymerization technology presents an effective method for recycling PET waste. This study investigated using Ni as an additive to enhance the catalytic activity of ZnO/Al₂O₃ catalyst for PET waste depolymerization. The effects of different catalysts, catalyst dosage, reaction temperature, and reaction time on PET waste depolymerization were studied using the single-factor controlled variable method. The results showed that the 3Ni-ZnO/Al₂O₃ was the optimal catalyst, and under the optimal conditions with catalyst dosage of 4 %, reaction temperature of 260 °C, and reaction time of 60 min, the depolymerization efficiency of PET waste could reach 100 %, with the highest yields of diethyl terephthalate (DET) and ethylene glycol (EG) of 93.6 % and 90.2 %, respectively. Response surface methodology (RSM) was used to optimize the operating conditions to obtain the highest monomer yields. The predicted optimal parameters from RSM were as follows: reaction temperature = 262.8 °C, reaction time = 63.2 min, catalyst dosage = 3.8 wt%, with the predicted highest DET and EG yields of 95.9 % and 90.7 %, respectively. The analysis of variance (ANOVA) results for DET and EG possessed the R² values of 0.9921 and 0.9885, respectively, with p-values < 0.0001, indicating a good fit for the models. Furthermore, after five times reuse, the 3Ni-ZnO/Al₂O₃ catalyst still exhibited good catalytic activity and stability. In conclusion, this study offers a clean, green, and sustainable alternative to recycling plastic waste.

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)