CeMn/TiO2 catalysts prepared by different methods for enhanced low-temperature NH3-SCR catalytic performance

Ce(1.0)Mn/TiO2 catalysts with the same Ce/Mn molar ratio were prepared by impregnation method and an in situ deposition method. Compared with the Ce(1.0)Mn/TiO2-IP catalyst prepared by impregnation, the Ce(1.0)Mn/TiO2-SP catalyst prepared by in-situ deposition showed better catalytic performance in a wide temperature window (150–300 °C) under high gas hourly space velocities ranging from 10,500 to 27,000 h−1. And Ce(1.0)Mn/TiO2-SP catalyst by in situ deposition method has a better sulfur resistance than Ce(1.0)Mn/TiO2-IP catalyst. Various characterization methods were used to explore the difference of the catalysts prepared by the two methods. The Ce(1.0)Mn/TiO2-SP catalyst exhibited a higher surface area, better thermal stability, a higher concentration of acidic sites, and less agglomeration than the Ce(1.0)Mn/TiO2-IP catalyst. Moreover, the in-situ deposition method resulted in an enhanced electron mobility effect that originated from MnOx and CeOx, thereby enhancing the low-temperature DeNOx efficiency.