Zinc {ONO} complexes for the chemical recycling of PET and PLA

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED Catalysis Today Pub Date : 2024-09-04 DOI:10.1016/j.cattod.2024.115037

Jack A. Stewart , Joseph I. Pearce , Matthew J. Cullen , Gabrielle Kociok-Köhn , Benjamin D. Ward , Matthew G. Davidson , Matthew D. Jones

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Abstract

Nine {ONO} ligands were prepared and treated with ZnEt₂ to form a range of complexes. The resulting complexes were characterised in solution through ¹H and ¹³C{¹H} NMR spectroscopy, and in the solid state through single-crystal XRD and elemental analysis. Moderate reactivity towards lactide polymerisation was demonstrated, with hydroxyl complexes reaching high conversion in 1–2 minutes at 300: 1: 1. All complexes successfully degraded PLA to methyl lactate and the effect of reaction time, temperature and catalyst loading was explored. Zn(4)₂ successfully produced ethyl and n-butyl lactate and was shown to work in ambient conditions, albeit with reduced yield and selectivity. The production of BHET from waste PET was demonstrated with a selection of the most active catalysts. Zn(4)₂ was shown to be capable of sequential PLA/PET degradation and to be tolerant of HDPE/PVC contaminants.

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用于 PET 和聚乳酸化学回收的{ONO}锌络合物

制备了九种 {ONO} 配体，并用 ZnEt2 处理形成一系列配合物。在溶液中通过 1H 和 13C{1H} NMR 光谱对所得到的配合物进行表征，在固态下通过单晶 XRD 和元素分析对配合物进行表征。NMR 光谱，并通过单晶 XRD 和元素分析对固态复合物进行了表征。在 300: 1: 1 的条件下，羟基复合物在 1-2 分钟内即可达到高转化率。所有络合物都成功地将聚乳酸降解为乳酸甲酯，并探讨了反应时间、温度和催化剂负载的影响。Zn(4)2 成功地生产出乳酸乙酯和乳酸正丁酯，并证明可在环境条件下工作，尽管产率和选择性有所降低。通过选择活性最高的催化剂，证明了从废 PET 中生产 BHET 的可行性。结果表明，Zn(4)2 能够连续降解聚乳酸/聚乙烯，并且能够耐受高密度聚乙烯/聚氯乙烯污染物。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Today 化学-工程：化工

CiteScore

11.50

自引率

3.80%

发文量

573

审稿时长

2.9 months

期刊介绍： Catalysis Today focuses on the rapid publication of original invited papers devoted to currently important topics in catalysis and related subjects. The journal only publishes special issues (Proposing a Catalysis Today Special Issue), each of which is supervised by Guest Editors who recruit individual papers and oversee the peer review process. Catalysis Today offers researchers in the field of catalysis in-depth overviews of topical issues. Both fundamental and applied aspects of catalysis are covered. Subjects such as catalysis of immobilized organometallic and biocatalytic systems are welcome. Subjects related to catalysis such as experimental techniques, adsorption, process technology, synthesis, in situ characterization, computational, theoretical modeling, imaging and others are included if there is a clear relationship to catalysis.