Co-based catalysts for the reduction of NOx with CO via the regulation of geometric and electronic structure

Abstract

The CO selective catalytic reduction of NO_x (CO-SCR) is considered an effective denitrification technology that can concurrently eliminate the harmful gases of NO_x and CO. Co-based catalysts have been widely researched because of their exceptional adsorption and activation capabilities for CO and NO_x, but their catalytic efficiency is frequently compromised by the presence of O₂, SO₂, and H₂O, which necessitates enhancements in long-term stability. This review presents various synthesis approaches of Co-based catalysts, summarizes the correlation between their valence states, particle sizes, oxygen vacancies, and catalytic performance, and examines the impacts of O₂, H₂O, and SO₂ on the CO-SCR process. Subsequently, the catalytic mechanisms of different Co-based catalysts are thoroughly detailed. Lastly, this review offers potential directions for the development of high-efficiency Co-based catalysts. The aim of this work is to provide theoretical guidance for the rational design of more effective Co-based catalysts for the CO-SCR reaction in industrial settings.