Advanced MnOx/TiO2 Catalyst with Preferentially Exposed Anatase {001} Facet for Low-Temperature SCR of NO

MnO x /TiO 2 (anatase) nanosheets (NS) with a preferentially exposed {001} facet was found to be a better catalyst for selective catalytic reduction (SCR) of NO than conventionally employed MnO x /TiO 2 nanoparticles (NP) with the {101} facet preferentially exposed, affording both high NO conversion and high N 2 selectivity at 80–280 °C. Further investigations indicated that Mn 3+ as the major species on TiO 2 (NS) was incorporated into octahedral vacancies with a lower polymerization degree, resulting in high catalytic activity for SCR and low activity for NH 3 oxidation, thus restraining the undesirable N 2 O generation. In comparison, on the surface of TiO 2 (NP), Mn 4+ as the major species was incorporated into tetrahedral vacancies in a highly polymerized state, leading to lower NO conversion and lower N 2 selectivity. The results indicate that it is possible to enhance the low-temperature SCR activity of the catalysts by tailoring the preferentially exposed facet of TiO 2 .