Glycolysis of poly (ethylene terephthalate) using DBU-based ionic liquid catalysts

IF 5.2 2区化学 Q1 CHEMISTRY, APPLIED

Catalysis Today Pub Date : 2025-01-13 DOI:10.1016/j.cattod.2025.115187

Fahimeh Forouzeshfar , M.R. Coleman , Joseph G. Lawrence

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引用次数: 0

Abstract

This research investigated depolymerization of poly (ethylene terephthalate) (PET) via glycolysis using a series of ionic liquid (IL) catalysts. Organic acids were paired with 1,8-Diazabicyclo [5.4.0] undec-7-ene (DBU) to produce ionic liquids (DBU-ILs). The study explored the effect of structural variations in the organic acids on PET conversion and bis (2-hydroxyethyl) terephthalate (BHET) yield under optimized reaction conditions (specifically, EG:PET ratio of 5:1, temperature of 190 °C, reaction time of 120 min, and 5 mol% DBU in the catalyst relative to PET). The organic acids were selected to include variation in the (i) number of carboxylic acids available to complex with DBU and (ii) structure of the linker and pendant groups to adjust the lipophilicity of the catalyst. The catalytic activity of the DBU-IL increased with increasing lipophilicity of organic acid. Catalysts with organic acids with aromatic linkers (i.e. terephthalic acid) exhibited lower activities than aliphatic linkers at similar lipophilicity. Notably, a linear relationship was observed between the catalytic activity and lipophilicity for diacids with aliphatic linker of increasing chain length. The apparent rate constant for the DBU-azelaic acid was 32 % greater than for DBU-oxalic acid. Reusability studies showed that there was minimal degradation of the catalytic activity of the DBU-ILs over five reaction cycles.

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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.