摘要
在VOCs催化氧化过程中,二氧化硫易与反应物在催化剂活性位点上产生竞争吸附行为,且能够与活性物种或载体反应生成硫酸盐使催化剂中毒,严重影响了催化氧化反应的效率.我们总结了催化剂的SO2中毒行为,概括了目前在贵金属、非贵金属催化剂的设计中应用较为广泛的抗SO2中毒措施,如助剂掺杂、双金属体系构建、载体改性、核壳结构设计等,剖析了催化剂酸性位的增强、结构的稳固、壳层保护等抵御SO2吸附与反应的原理,并对VOCs领域内抗SO2中毒催化剂的设计进行了总结与展望.
Abstract
In the catalytic oxidation process of VOCs,sulfur dioxide is easy to produce competitive adsorption behavior with reactants at the active sites of the catalyst,and can react with active species or carriers to produce sulfate,causing catalyst poisoning,which seriously affects the efficiency of catalytic oxidation reaction.This review summarizes the SO2 poisoning behavior of catalysts,outlines the anti-SO2 poisoning measures widely used in the design of noble metal and non-noble metal catalysts,such as additive doping,bimetal system construction,carrier modification,core-shell structure design,etc.,and analyzes the principle of strengthening the acid site of catalysts,structural stability,shell protection and other resistance to SO2 adsorption and reaction.Finally,the design of anti-SO2 poisoning catalysts in the field VOCs is summarized and prospected.
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