Research progress on the mechanism of sulfur poisoning and resistance improvement of noble metal catalysts
SO2 impurities are commonly encountered in practical industrial exhaust gases.During cata-lytic purification processes,SO2 molecules compete with reactants for active sites.Particularly,SO2 can undergo chemical reactions with noble metals,forming sulfate salts.This interaction weakens electron transfer capabilities,leading to severe and irreversible sulfur poisoning of catalysts.Therefore,effi-ciently regenerating sulfur-poisoned catalysts or designing sulfur-resistant catalysts has become a crucial challenge in the field of environmental catalysis.This paper begins by analyzing the adsorption,migration,and transformation processes of SO2 on noble-metal based catalysts.It then explores methods for regenerating sulfur-poisoned catalysts and elucidates the involved mechanisms.Subse-quently,it summarizes strategies for designing noble-metal based catalysts with excellent sulfur-resist-ance,including active phase regulation,support modification,and the construction of encapsulated structures,emphasizing that the key to developing sulfur-resistant catalysts lies in enhancing metal-metal/support interactions.Finally,it discusses future research directions for noble-metal based cata-lysts with excellent sulfur-resistance,aiming to provide guidance for the optimized design of industrial sulfur-resistant catalysts.
万方数据
维普
