北京大学马丁团队报道了PET和CO₂催化转化为高附加值化学品。相关研究成果发表在2022年1月5日出版的《德国应用化学》。

聚对苯二甲酸乙二醇酯（PET）和CO₂这两种急需在环境中转化的化学废物，通过CO₂加氢、PET甲醇解和对苯二甲酸二甲酯（DMT）加氢三个反应的协同耦合，在一锅催化过程中能够同时转化。更有趣的是，由于双重促进效应，两个反应的化学平衡向前移动，导致PET解聚显著增强。由于甲醇在PET甲醇解过程中就地消耗，CO₂加氢产生的甲醇总产量超过了原始热力学平衡极限。

由于初级产品DMT氢化为环己烷二甲酸二甲酯（DMCD）或对二甲苯（PX），PET的化学计量比甲醇降解显著增强。该协同催化过程为同时回收聚酯和二氧化碳这两种废物生产高价值化学品提供了有效途径。

附：英文原文

Title: Catalytic Transformation of PET and CO2 into High-Value Chemicals

Author: Yinwen Li, Meng Wang, Xingwu Liu, Chaoquan Hu, Dequan Xiao, Ding Ma

Issue&Volume: 2022-01-05

Abstract: Polyethylene terephthalate (PET) and CO2, two chemical wastes that urgently need to be transformed in the environment, are converted simultaneously in a one-pot catalytic process through the synergistic coupling of three reactions: CO2 hydrogenation, PET methanolysis and dimethyl terephthalate (DMT) hydrogenation. More interestingly, the chemicals equilibria of both reactions were shifted forward due to a revealed dual-promotion effect, leading to significantly enhanced PET depolymerization. The overall methanol yield from CO2 hydrogenation exceeded the original thermodynamic equilibrium limit since the methanol was in-situ consumed in PET methanolysis. The degradation of PET by a stoichiometric ratio of methanol was significantly enhanced because the primary product, DMT was hydrogenated to dimethyl cyclohexanedicarboxylate (DMCD) or p-xylene (PX). This synergistic catalytic process provides an effective way to simultaneously recycle two wastes, polyesters and CO2, for producing high-value chemicals.

DOI: 10.1002/anie.202117205

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202117205