还原法脱除烟气中SO_x和/或NO_x的研究进展

Progress of reduction technology on removing SO_x and/or NO_x from flue gas

催化裂化再生过程会排放大量的环境污染物SO_x和NO_x,为保护环境对该过程进行脱硫脱硝是必不可少的措施。还原法脱硫脱硝能够实现SO_x到单质硫的资源化、NO_x到N_2的无害化,且无二次污染产生,增加了一条候选的路线。本文将还原法按催化剂类别分为炭基催化剂还原法、金属氧化物催化剂还原法、稀土催化剂还原法以及其他类型催化剂还原法四大类,简述了还原法脱硫脱硝技术的研究进展、不同催化剂的脱硫脱硝效率及其反应机理,指出了新型催化剂的研发是该技术发展的关键,展望了还原法用于催化裂化烟气治理的前景。

The process of fluid catalytic cracking （FCC） regeneration produces a large number ofenvironmental pollutants, SOx and NOx. In order to protect the environment, desulfurizationand denitrification of the process is an essential measure. Desulfurization and denitrification withreduction, which having the advantages of local resources to SOx and unharmed to NO x, is beinganother candidate route for users. In this paper, the reduction method is divided into fourcategories： carbon based catalyst reduction, metal oxide catalyst reduction, rare earth catalystreduction and other types of catalyst reductive method. The progress of reduction technology,the efficiency of desulfurization and denitrification with different catalysts and the reactionmechanisms were reviewed in this paper. It is pointed out that the research of the novel catalystsis the key to the development of the reduction technology, and the prospect of the reductiontechnology for the FCC flue gas treatment is also discussed.