Engineering Atomic Monodispersed Mn‐O‐Nd Asymmetric Sites in TiO ₂ Nanotubes for Low Temperature NH ₃ ‐SCR With Exceptional H ₂ O/SO ₂ Resistance

ABSTRACT Herein, we exploited the skeleton confinement effect of TiO 2 nanotubes to construct atomic monodispersed asymmetric sites Mn‐O‐Nd in the application of NH 3 ‐SCR. The in situ introduction of Nd induced the formation of atomically dispersed asymmetric Mn‐O‐Nd sites, which effectively modulated the electronic environment around the Mn, thereby significantly promoting the activation of O 2 and NO. Meanwhile, the atomically dispersed Nd species increased the Lewis acid sites to suppress the adsorption of SO 2 and inhibited the direct electron transfer between SO 2 and metal active sites Mn‐O‐Nd. The catalyst MnNd‐TNTs exhibited nearly 100% NO conversion within 140°C–300°C and better H 2 O/SO 2 tolerance. DFT calculations and in situ DRIFTS also revealed that atomically dispersed Nd species could modulate the electronic energy of d‐Mn near the Fermi level, enabling better matching with NH 3 and NO. This facilitated the activation of NH 3 and NO to accelerate the occurrence of the ‘fast‐SCR’ reaction. This work highlights the design of atomic asymmetric architectures as a viable strategy to boost the low‐temperature activity of catalysts, which provides valuable insights into the rational design of high low‐temperature performance in NH 3 ‐SCR reaction.