Recent advances in simultaneous removal of SO2 and NOx from exhaust gases: Removal process, mechanism and kinetics

Rong Chen, Tongsheng Zhang*, Yiqun Guo, Jiawei Wang, Jiangxiong Wei, Qijun Yu

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

Abstract

SO2 and NOx, major gaseous pollutants in exhaust gas, can exert adverse effects on human health and environmental disaster. Therefore, numerous desulfurization (de-SO2) and denitrification (de-NOx) technologies have been designed to reduce SO2 and NOx emissions. Compared to traditional multi-step removal processes, simultaneous removal of SO2 and NOx has been attracting significant attention recently. This paper timely reviewed available literature focused on simultaneous de-SO2 and de-NOx methods, which are classified into four pathways as oxidation, reduction, adsorption/absorption and microbial purification. The removal process, basic mechanism and kinetics of each pathway are systematically reviewed in consideration of reactants, catalyzers, temperatures and atmosphere. Moreover, the main challenges and potential breakthroughs in developing novel simultaneous de-SO2 and de-NOx methods are critically discussed to provide a roadmap for prospective research activities. Therefore, this review provides a deeper insight in understanding the mechanisms of de-SO2 and de-NOx, and then helps to develop innovative simultaneous removal methods or improve the efficiency of available abatement methods.

Original languageEnglish
Article number127588
JournalChemical Engineering Journal
Volume420
Issue numberPart 2
Early online date28 Nov 2020
DOIs
Publication statusPublished - 15 Sep 2021

Keywords

  • Absorption or adsorption
  • Catalytic oxidation
  • Catalytic reduction
  • Microbial desulfurization and denitrification
  • Simultaneous SO and NO removal

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