Catalytic depolymerization of poly(ethylene terephthalate) plastic into value-added monomers using metal-modified mesoporous silica

IF 7.5 1区工程技术 Q2 ENERGY & FUELS Fuel Pub Date : 2024-11-30 DOI:10.1016/j.fuel.2024.133858

Taishun Yang , Hao He , Shiyu Yan , Jiaojiao Gao , Zixu Yang , Jing Xu

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Abstract

The glycolysis of poly(ethylene terephthalate) (PET), a polymer extensively used in food packaging, into bis(2-hydroxyethyl) terephthalate (BHET) monomers was investigated using mesoporous silica supported by metal oxide as catalysts. Among these, a catalyst composed of ZnO supported on KIT-6 (5%ZnO/KIT-6) showed an effective performance in PET glycolysis, achieving a BHET yield of 92.1% with complete conversion of PET. Additionally, the catalyst demonstrated exceptional reusability and high efficiency in handling post-consumer PET plastics, with BHET yields reaching up to 89%. Characterization studies revealed that the highly dispersed ZnO nanoparticles trapped in KIT-6 channels formed strong interactions with surface Si-OH groups, leading to an enhanced acid strength and an increased number of acid sites, which significantly improved PET depolymerization. This study presents an innovative solution for the recycling of PET plastic, contributing to industrial development and reducing the impact of plastic waste.

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用金属改性介孔二氧化硅催化聚对苯二甲酸乙酯塑料解聚成增值单体

以金属氧化物负载介孔二氧化硅为催化剂，研究了广泛应用于食品包装的聚合物聚对苯二甲酸乙酯（PET）的糖解法制备双（2-羟乙基）对苯二甲酸乙酯（BHET）单体。其中，由ZnO负载KIT-6 （5%ZnO/KIT-6）组成的催化剂在PET糖酵解中表现出有效的性能，在PET完全转化的情况下，BHET的产率达到92.1%。此外，该催化剂在处理消费后PET塑料方面表现出卓越的可重复使用性和高效率，BHET的收率高达89%。表征研究表明，被困在KIT-6通道中的高度分散的ZnO纳米颗粒与表面Si-OH基团形成强相互作用，导致酸强度增强，酸位数量增加，从而显著改善PET解聚。本研究为PET塑料的回收提供了一种创新的解决方案，有助于工业发展和减少塑料废物的影响。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.