Tailoring a Novel Ce/WZrTiO _x Catalyst with Excellent High‐Temperature NH ₃ ‐SCR Activity and SO ₂ Resistance

Abstract Up to now, high performance high‐temperature denitrification catalyst has been rarely systematically studied and elucidated. The reduction in the number of active sites, attributed to the agglomeration and growth of active nanoparticles at high temperature, which is a key factor limiting the activity of NH 3 ‐SCR catalysts. In this work, a novel Ce/WZrTiO 2 catalyst is designed, and Zr, W species are doped into the lattice of the TiO 2 , which effectively inhibits the phase transformation of TiO 2 from anatase to rutile and stabilizes the surface chemistry of the catalyst at high‐temperature. Meanwhile, the interaction between Zr and W species increases the surface acidity of the catalyst, which is beneficial to improve the activity of the catalyst at high temperatures. Importantly, a new active site Ce 3+ ‐O‐W 6+ was formed on Ce 5 /W 10 Zr 10 TiO 2 at high temperature, which compensated for the reduction in the number of active sites attributed to CeO 2 agglomeration, and enabled Ce 5 /W 10 Zr 10 TiO 2 to realize the dynamic coordination of active sites, so that Ce 5 /W 10 Zr 10 TiO 2 can maintain a high NO x conversion. The NO x conversion of Ce 5 /W 10 Zr 10 TiO 2 exceeds 80% in a wide temperature range of 240–520 °C. Even when 20 vol% H 2 O/150 ppm SO 2 was introduced, the NO x conversion remained basically stable within 12 h. Combining with DFT calculation and in‐situ DRIFTS analysis, the anti‐poisoning mechanism of Ce/WZrTiO 2 catalyst in the high‐temperature NH 3 ‐SCR reaction process has been clearly elucidated. This study provides important theoretical basis for future exploration and design of high‐temperature denitrification catalysts.