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

• Published in: Applied catalysis. B, Environmental Environmental, 2022-12, Vol.318, Article 121779
• Main Authors: Li, Yonglong, Chen, Hunan, Chen, Lei, Zhang, Yingying, Mi, Yangyang, Liao, Meiyuan, Liu, Wenming, Wu, Daishe, Li, Zhenguo, Peng, Honggen
• Format: Article
• Language: English
• Subjects: Air pollution control; Ammonia selective catalytic reduction; Denitration; Dual active sites tuning strategy; Ternary MnCoVOx catalysts
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2022.121779

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. [Display omitted] •Mn0.50Co0.49V0.01Ox catalyst with superior deNOx performance was prepared by a dual acid-redox sites tuning strategy.•Above 80% NOx conversion was realized at 162-508 °C under the humid reaction conditions over the optimal catalyst.•The V modification can greatly improve the NH3-SCR performance and restrain the generation of N2O.•The acid sites play a major role in NH3-SCR processes over the V-doped catalysts.•The Mn0.50Co0.49V0.01Ox showed better SO2 resistance due to less sulfates formation.