Ternary MnCoVOx catalysts with remarkable deNOx performance: Dual acid-redox sites control strategy

Abstract

How to widen the active temperature window of metal oxide catalysts for abatement of NOx is urgent for their real application. Herein, a series of ternary MnCoVOx 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 Mn0.50Co0.49V0.01Ox catalyst after vanadium tuning exhibited superior catalytic performance, achieving > 80% NOx conversion over a wide temperature window (162−508 °C) under the humid reaction condition, the selectivity of N2 > 85% up to 510 °C, and also displayed enhanced SO2 tolerance. Compared with the commercial Cu-SSZ-13 catalyst, the ternary MnCoVOx 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.