Recent progress of heterogeneous catalysts towards selective catalytic reduction of NO by CO under oxygen-rich conditions
Nitrogen oxides(NOx),as one of the predominant atmospheric pollutants mainly derived from automobile exhaust and industrial waste gas,have played the role of an inevitable precursor that led to acid rain,photochemical smog,and other environmental contamination issues.In addition to atmospheric pollution,the growing emissions of NOx pollutants also give rise to a serious threat to agricultural production and human health.Thus,it is of urgent need to develop feasible NOx abatement strategies.Selective catalytic reduction of NO by CO(CO-SCR)is a very promising denitrification technology that can simultaneously remove harmful gases of NO and CO,making it one of the most ideal solutions for flue gas treatment.To promote its industrial applications,CO-SCR should have a low operating temperature ranging from 150℃ to 250℃ and superior resistance to oxygen poison.Therefore,there is an urgent need to develop efficient CO-SCR catalysts used under oxygen-rich conditions for abating severe environmental pollution problems.This work provides a comprehensive review of the research progress and latest research findings of CO-SCR under oxygen-containing conditions.The research advances of Pd,Ir,Rh,Mn,and Co-based heterogeneous catalysts were introduced,and the effects of active components,promoters,and supports on the catalytic performance of CO-SCR are described in detail.In this section,the preparation method,doping modification,and reaction conditions are analyzed.Meanwhile,the impact of O2,H2O,and SO2 on the catalytic activity of CO-SCR is discussed,in which the inhibition mechanism of O2 is summarized.Finally,the challenges and future developments of CO-SCR under oxygen-rich conditions are summarized and the corresponding coping solutions are proposed.We hope this review can provide an in-depth understanding and useful guidance for the rational design of efficient heterogeneous catalysts for the CO-SCR reaction in practical applications.
CO catalytic reduction of NOO2 resistancecatalytic mechanismheterogeneous catalysis
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