Abstract

Chlorinated volatile organic compounds (Cl-VOCs) are characterized by severe toxicity, high chemical stability, and low biodegradability. As such, they are regarded as hazardous gas pollutants. However, Cl substitution brings higher tendency in catalyst deactivation by Cl deposition, and different behaviors with the presence of water, other VOCs, NO_x, SO₂, and heavy metals. In this review, we provide a systematic summary on the progress and achievements in Cl-VOC catalytic degradation from a holistic perspective. Six types of Cl-VOCs, that is dichloromethane, dichloroethane, vinyl chloride, trichloroethylene, chlorobenzene, and dichlorobenzene are selected to represent chlorinated alkanes, alkenes, and aromatics. Variations in degradation efficiency, long-term stability, and the effects of water and other components are summarized to provide an insight into the intrinsic process involved in Cl-VOC catalytic degradation. This review also highlights strategies for alleviating Cl poisoning to provide guidances on the development of catalysts for Cl-VOC efficient elimination under practical application conditions.

摘要

氯化挥发性有机化合物 (Cl-VOCs) 具有毒性大、化学稳定性高和生物降解性低的特点。因此，它们被视为有害气体污染物。然而，Cl 取代导致催化剂因 Cl 沉积而失活的趋势更高，并且随着水、其他 VOCs、NO _x、SO ₂的存在而产生不同的行为, 和重金属。在这篇综述中，我们从整体的角度对Cl-VOC催化降解的进展和成就进行了系统总结。选取二氯甲烷、二氯乙烷、氯乙烯、三氯乙烯、氯苯、二氯苯六类Cl-VOCs分别代表氯化烷烃、烯烃和芳烃。总结了降解效率、长期稳定性以及水和其他成分的影响的变化，以深入了解 Cl-VOC 催化降解的内在过程。该综述还重点介绍了减轻 Cl 中毒的策略，为在实际应用条件下开发有效消除 Cl-VOC 的催化剂提供指导。