Enhancement effects of Er modification on comprehensive performance of FeMn/TiO2 catalysts for selective reduction of NO with NH3 at low temperature. Issue 4 (August 2021)

• Record Type: Journal Article
• Authors: Du, Huan; Han, Zhitao; Wu, Xitian; Wang, Qimeng; Li, Chenglong; Gao, Yu; Yang, Shaolong; Song, Liguo; Dong, Jingming; Pan, Xinxiang
• Is Part Of: Journal of environmental chemical engineering. Volume 9:Issue 4(2021)
• Publication Date: 2021-08
• Subjects: Low temperature -- Selective catalytic reduction -- FeMn/TiO2 -- Erbium; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2021.105653
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Erbium (Er) has been used as a novel dopant to modify FeMn/TiO2 catalyst for the selective catalytic reduction of NO with NH3 . The optimized Er x FeMn/TiO2 catalyst exhibited excellent catalytic performance at low temperature under a high space velocity of 30, 000 h −1 . The temperature window for NO conversion efficiency higher than 80% ranged from 100° to 240°C. The catalysts were characterized using XRD, BET, H2 -TPR, NH3 -TPD, XPS, TGA and In-situ DRIFT. The results showed that Er modification on FeMn/TiO2 catalysts increased the specific surface area, dispersion, reducibility, Mn 4+ concentration, and especially the concentration of Lewis acid sites and surface chemisorbed labile oxygen, resulting in an excellent catalytic performance at low temperature. Additionally, Er modification also restrained the formation of sulfate and/or bisulfate salts, which improved the resistance to SO2 and H2 O of the catalyst. Graphical Abstract: ga1 Highlights: Er-modified FeMn/TiO2 catalysts were prepared via wet impregnation. Er modification promoted low-temperature catalytic performance and SO2 resistance. Er modification increased Lewis acid sites and chemisorbed oxygen on the surface. Er modification was in favor of suppressing the generation of sulfate salts.