Improvement of sulfur and water resistance with Fe-modified S-MnCoCe/Ti/Si catalyst for low-temperature selective catalytic reduction of NO with NH 3

• Published in: Chemosphere (Oxford) Vol. 302; p. 134740
• Main Authors: Qiu, Lu, Li, Dengkui, Li, Hanliang, Ren, Zhaoyong, Zhu, Zhenye, Ouyang, Feng, Guo, Mingxin
• Format: Journal Article
• Language: English
• Published: England 27.04.2022
• Subjects: Metal oxides; NO(x) removal; Water durability; Low temperature SCR; Sulfur tolerance
• ISSN: 1879-1298

The low-temperature SCR of NO by NH is restricted in application since the catalysts is easily poisoned by sulfur and water. The Fe modified Mn-Co-Ce/TiO /SiO catalysts synthesized via impregnation method and sulfating were evaluated for low-temperature NH -SCR in the presence of SO and H O. The calcination temperature and loading amounts of Mn, Fe, Co and Ce were optimized. Adding of Fe into S-MnCoCe/Ti/Si played an important role in resistance to sulfur and water poisoning. The optimal calcination temperature was 380 °C and the optical mass loading of the catalyst was 10% of Mn, 10% of Fe, 1% of Co and 4% of Ce. The optimal S-MnFeCoCe/Ti/Si catalyst maintained high NO conversion of 93% at reaction temperature of 160 °C in the presence of 50 ppm SO and 10 vol% H O. The catalytic activity did not continue to fall after two times of repeated used in the temperature range of 100-200 °C, indicating its excellent sulfur and water durability and stability in the presence of SO and H O. The interaction between MnO and FeO enhanced sulfur and water durability rather than other bi-metal interactions. Furthermore, the mechanism of Fe improving resistance to SO and H O was discussed.