化工进展2023，Vol.42Issue(11)：5969-5980,12.DOI:10.16085/j.issn.1000-6613.2022-2376
VOCs在活性炭中的堆积:形成机制及影响因素
Heel of VOCs in activated carbon:Formation mechanism and influencing factors
摘要
Abstract
Activated carbon adsorption is an efficient approach to the purification of industrial organic waste gases containing volatile organic compounds(VOCs).However,it is common that activated carbon adsorbed with VOCs is difficult to be completely desorbed,especially in the purification of exhaust gases containing styrene and butadiene,in which the adsorption capacity of activated carbon decreases significantly after desorption.This paper conducted a critical survey on the state-of-the-art of research on activated carbon adsorption/desorption in recent years,and then summarized the reasons for the decay of adsorption performance of activated carbon,identified the species in the heel substances,as well we discussed heel formation mechanism with aim to clarify the influencing factors.The results indicated that the adsorbed VOCs formed heel and block the pore through pyrolysis,coupling,polymerization,thermal oxidation reactions and chemisorption during the cyclic adsorption/desorption process of activated carbon.Heel may be chemisorbed species,semi-coke/coke and polymers.Factors including high adsorption temperatures,low regeneration heating rates,high purge gas flow rates,VOCs with high boiling points and large kinetic diameters and activated carbons with high microporosity may result in the heel formation;meanwhile,it was difficult to figure out the influence of desorption temperatures,oxygen impurities in desorption purge gas,molecular structure of VOCs,activated carbon surface oxygen groups and inorganic composition at present.More efficient regeneration methods,directional preparation and modification of activated carbon may be the technical ways to mitigate heel in activated carbon during VOCs purification.关键词
挥发性有机物/活性炭/堆积/机制/影响因素Key words
VOCs/activated carbon/heel/mechanism/influencing factor分类
资源环境引用本文复制引用
周红阳,周逸寰,张连秀,梁鼎成,解强..VOCs在活性炭中的堆积:形成机制及影响因素[J].化工进展,2023,42(11):5969-5980,12.基金项目
国家重点研发计划(2022YFC3701901). （2022YFC3701901）
