Zinc {ONO} Complexes for the Chemical Recycling of PET and PLA

Jack A. Stewart; Joseph I. Pearce; Matthew J. Cullen; Gabriele Kociok-Kohn; Benjamin D. Ward; Matthew G. Davidson; Matthew D. Jones

doi:10.1016/j.cattod.2024.115037

Zinc {ONO} Complexes for the Chemical Recycling of PET and PLA

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

Cardiff University

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	115037
Journal	Catalysis Today
Volume	445
Early online date	4 Sept 2024
DOIs	https://doi.org/10.1016/j.cattod.2024.115037
Publication status	E-pub ahead of print - 4 Sept 2024

Data Availability Statement

Data will be made available on request.

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10.1016/j.cattod.2024.115037Licence: CC BY

Cite this

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title = "Zinc {ONO} Complexes for the Chemical Recycling of PET and PLA",

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.",

author = "Stewart, {Jack A.} and Pearce, {Joseph I.} and Cullen, {Matthew J.} and Gabriele Kociok-Kohn and Ward, {Benjamin D.} and Davidson, {Matthew G.} and Jones, {Matthew D.}",

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doi = "10.1016/j.cattod.2024.115037",

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TY - JOUR

T1 - Zinc {ONO} Complexes for the Chemical Recycling of PET and PLA

AU - Stewart, Jack A.

AU - Pearce, Joseph I.

AU - Cullen, Matthew J.

AU - Kociok-Kohn, Gabriele

AU - Ward, Benjamin D.

AU - Davidson, Matthew G.

AU - Jones, Matthew D.

PY - 2024/9/4

Y1 - 2024/9/4

N2 - 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.

AB - 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.

U2 - 10.1016/j.cattod.2024.115037

DO - 10.1016/j.cattod.2024.115037

M3 - Article

SN - 0920-5861

VL - 445

JO - Catalysis Today

JF - Catalysis Today

M1 - 115037

ER -

Zinc {ONO} Complexes for the Chemical Recycling of PET and PLA

Abstract

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