文献类型：期刊文献

英文题名：Recycling of polystyrene waste to mono-aromatic hydrocarbons via intermittent thermal scission

作者：Lin, Zhuohan[1];Li, Jiaxin[1];Xu, Wang[1];Ruan, Qiaohui[1];Hu, Jiakang[1];Yuan, Peiqing[2];Li, Yan[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2025

卷号：27

期号：27

起止页码：8154

外文期刊名：GREEN CHEMISTRY

收录：;EI(收录号：20252618673776);WOS:【SCI-EXPANDED(收录号:WOS:001510811200001)】；

基金：This research was sponsored by the National Natural Science Foundation of China (22178113), the Natural Science Foundation of Shanghai (23ZR1415900) and the Fundamental Research Funds for the Central Universities (222201717003). The authors thank the Research Center of Analysis and Test of East China University of Science and Technology for helping with characterization.

语种：英文

外文关键词：Aromatic hydrocarbons - Depolymerization - Environmental impact - Oligomers - Plastic recycling - Waste management

摘要：Polystyrene (PS) is a widely used plastic that contributes significantly to plastic waste. Chemical recycling of PS into valuable industrial mono-aromatic hydrocarbons (MAHs) offers a promising approach for mitigating the environmental impact of PS waste while simultaneously valorizing it. However, current methods typically achieve MAH yields of less than 75%, with limited potential for significant improvement. Here, we propose a novel cyclic depolymerization and repolymerization strategy to precisely control PS pyrolysis without catalysts. This method alternates depolymerization at around 400 degrees C with repolymerization at around 300 degrees C in a semi-batch system, achieving an unprecedented MAH yield (MAH selectivity up to 95% with liquid yields exceeding 90 wt%). Repolymerization forms cross-linked structures, effectively suppressing oligomer formation and converting low-reactivity oligomers into more reactive polymer segments, which is crucial for achieving extraordinarily high MAH yields. This "intermittent" scission strategy is broadly applicable to diverse PS waste streams, highlighting its potential for sustainable waste management.