Wang Haobo, Xu Shumao, Dong Wujie, Sun Du, Zhang Shaoning, Han Zhen, Huang Fuqiang
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, P. R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Chemistry. 2022 Apr 22;28(23):e202200124. doi: 10.1002/chem.202200124. Epub 2022 Mar 21.
Polyvinyl chloride (PVC) is widely used in daily life, but its waste has become a serious environmental problem. A solid base assisted low-temperature solvothermal dehalogenation was developed in this work to sustainably and efficiently transform PVC into high-value dimethylamine hydrochloride (DMACl) chemical and N,O co-doped carbon monolith with hierarchically porous structure. The synergistic promotion of solid-base catalyst and solvent decomposition with the removal of HCl can shift forward the chemical equilibrium to promote the dechlorination of PVC and increase the carbon yield. Meanwhile, the solid-base catalyst can also act as a pore-forming additive to fabricate the carbon monolith with hierarchical pores. Induced by the high specific surface area, hierarchical pores and N,O co-doped structure, the generated carbon monolith exhibits superior electrocatalytic performance towards H evolution. These discoveries shed light on the design of synergistically coupled solvent and solid catalyst to promote the heterogeneous conversion of waste chlorinated plastics into high-value chemicals for a sustainable future.
聚氯乙烯（PVC）在日常生活中被广泛使用，但其废弃物已成为严重的环境问题。本研究开发了一种固体碱辅助的低温溶剂热脱卤方法，以可持续且高效地将PVC转化为高价值的盐酸二甲胺（DMACl）化学品和具有分级多孔结构的N、O共掺杂碳块。固体碱催化剂与溶剂分解对HCl去除的协同促进作用可使化学平衡正向移动，从而促进PVC的脱氯并提高碳产率。同时，固体碱催化剂还可作为成孔添加剂来制备具有分级孔的碳块。由于具有高比表面积、分级孔和N、O共掺杂结构，所生成的碳块对析氢表现出优异的电催化性能。这些发现为协同耦合溶剂和固体催化剂的设计提供了思路，以促进废弃氯化塑料向高价值化学品的多相转化，实现可持续发展的未来。
