Improving the tolerance to alkali and alkaline earth metal chlorides of WO3 and Nb2O5 promoted V2O5/TiO2 catalysts for the NH3-SCR reaction

Effect of Various Acid Anions on Potassium Poisoning and the Mechanism of Commercial V2O5–WO3/TiO2 Catalysts for SCR of NOx

“…As displayed in Figure a, for the fresh catalyst, the bands at 3391, 3333, 3265, 3168, and 2877 cm –1 were assigned to the stretching vibration of NH 3 adsorbed on Lewis acid sites . The bands at 2965 and 2794 cm –1 were assigned to the stretching vibration of NH 4 + on Brønsted acid sites. , The bands at 1604 and 1669 cm –1 were assigned to the asymmetric deformation vibration of NH 3 adsorbed on Lewis , and Brønsted acid sites, respectively. The other bands at 1300 and 1448 cm –1 were assigned to the symmetric bending vibration of NH 3 adsorbed on Lewis , and Brønsted acid sites, ,, respectively.…”

“…12 The bands at 2965 and 2794 cm −1 were assigned to the stretching vibration of NH 4 + on Brønsted acid sites. 26,45 The bands at 1604 and 1669 cm −1 were assigned to the asymmetric deformation vibration of NH 3 adsorbed on Lewis 35,46 and Brønsted acid sites, 47 respectively. The other bands at 1300 and 1448 cm −1 were assigned to the symmetric bending vibration of NH 3 adsorbed on Lewis 26,35 and Brønsted acid sites, 26,36,47 respectively.…”