Ternary MnCoVO catalysts with remarkable deNO performance: Dual acid-redox sites control strategy

How to widen the active temperature window of metal oxide catalysts for abatement of NO x is urgent for their real application. Herein, a series of ternary MnCoVO x metal oxide catalysts with outstanding denitration performance were designed via a simple dual acid-redox sites tuning strategy, which is to inhibit the redox ability properly and enhance the acidity to make the catalyst exerts the optimum. The Mn 0.50 Co 0.49 V 0.01 O x catalyst after vanadium tuning exhibited superior catalytic performance, achieving > 80% NO x conversion over a wide temperature window (162 − 508 °C) under the humid reaction condition, the selectivity of N 2 > 85% up to 510 °C, and also displayed enhanced SO 2 tolerance. Compared with the commercial Cu-SSZ-13 catalyst, the ternary MnCoVO x catalysts showed comparable activity but better sulfur resistance. Thereby, the easy-synthesized and low-cost ternary metal oxides based on the dinuclear active sites tuning strategy pave a way for designing superior denitration catalysts for practical applications. • Mn 0.50 Co 0.49 V 0.01 O x catalyst with outstanding NH 3 -SCR performance was prepared by a simple dual acid-redox sites tuning strategy. • Above 80% NO x conversion was realized at 162 − 508 °C under the humid reaction conditions over the Mn 0.50 Co 0.49 V 0.01 O x catalyst. • The V modification can greatly improve the NH 3 -SCR performance and restrain the generation of N 2 O. • The acid sites play a major role in NH 3 -SCR processes over the V-doped catalysts. • The Mn 0.50 Co 0.49 V 0.01 O x showed better SO 2 resistance due to less sulfates formation.