A comprehensive review of NOx and N2O mitigation from industrial streams. (March 2022)

• Record Type: Journal Article
• Authors: Alves, Luís; Holz, Laura I.V.; Fernandes, Celina; Ribeirinha, Paulo; Mendes, Diogo; Fagg, Duncan P.; Mendes, Adélio
• Is Part Of: Renewable & sustainable energy reviews. Volume 155(2022)
• Publication Date: 2022-03
• Subjects: NOx -- N2O -- Denitrification -- Selective catalytic reduction -- Catalytic decomposition -- Selective non-catalytic reduction -- Electron beam -- Electrochemical reduction; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.rser.2021.111916
• Languages: English
• ISSNs: 1364-0321

Abstract

Abstract: Mitigation of NOx and N2 O emissions is a major concern as these substances can cause extensive damages to the atmosphere, soil, water, and humans. Selective catalytic reduction is currently the most effective and widespread technology to remove nitrogen oxides from flue streams. Other methods are also used on a case-by-case basis, most noticeably i) Catalytic decomposition of NOx and N2 O, in which nitrogen oxides are decomposed in the absence of other reactants, and ii) selective non-catalytic reduction, which is generally applied when the use of catalytic beds is limited or impossible. Currently, all these technologies suffer limitations, a situation that has led to an interest in the conceptualization and development of new strategies. Electron beam irradiation and electrochemical reduction are some of the most promising prospective technologies, which have the potential to contribute to a rethinking of the state of the art in NOx and N2 O mitigation. The current article provides an overview of all these technologies, considering process specifics and the advantages and disadvantages of their implementation. Highlights: Selective catalytic reduction is the most widespread denitrification technology. Alternative technologies are only competitive in particular situations. Disadvantages of current technologies have created interest for new alternatives. New prospective denitrification concepts have shown promising results. Further research is required to make new technologies competitive.