Promising selective catalytic reduction of NOx by CO: Status, Challenges, and perspective

Abstract

The selective catalytic reduction of NO_x by CO (CO-SCR) is considered a promising alternative to NH₃-SCR technology because it can simultaneously reduce both harmful emissions. However, its practical application is impeded by several catalyst drawbacks, including narrow working temperature range and low tolerance to O₂, H₂O, and SO₂. This review offers an overview of recent advancements in CO-SCR to aid in accelerating its progress. This paper commences by discussing the principles of thermodynamics and kinetics, and then introduces primarily researched catalysts that can modify kinetic factors. A comprehensive analysis is conducted on catalyst design strategies, emphasizing composition and structural control. Furthermore, the reaction mechanism is explored through a detailed categorization discussion. Finally, the paper concludes by highlighting the current challenges and proposing future research directions, focusing on enhancing the design of high-efficiency denitration catalysts. The novel catalysts suggested in this review are believed to have significant potential for diverse reactions.