Effect of different acid anions on highly efficient Ce-based catalysts for selective catalytic reduction of NO with NH3
De Fang1,2,3, Guanlin Huang3, Jingyi Yang3, Shengxing Pan3, Caihong Lv4(), Da Li5
1. Center for Materials Research and Analysis, Wuhan University of Technology, Wuhan 430070, China 2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China 3. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 4. School of Printing & Packaging, Wuhan University, Wuhan 430072, China 5. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 256600, China
Three kinds of Ce-based catalysts (CePO4, CeVO4, Ce2(SO4)3) were synthesized and used for the selective catalytic reduction (SCR) of NO by NH3. NH3-SCR performances were conducted in the temperature range of 80 to 400 °C. The catalytic efficiencies of the three catalysts are as follow: CePO4 > CeVO4 > Ce2(SO4)3, which is in agreement with their abilities of NH3 adsorption capacities. The highest NO conversion rate of CePO4 could reach about 95%, and the catalyst had more than 90% NO conversion rate between 260 and 320 °C. The effect of PO43–, VO43– and SO42– on NH3-SCR performances of Ce-based catalysts was systematically investigated by the X-ray photoelectron spectroscopy analysis, NH3 temperature programmed desorption, H2 temperature programmed reduction and field emission scanning electron microscopy tests. The key factors that can enhance the SCR are the existence of Ce4+, large NH3 adsorption capacity, high and early H2 consumptions, and suitable microstructures for gas adsorption. Finally, CePO4 and CeVO4 catalysts also exhibited relatively strong tolerance of SO2, and the upward trend about 8% was detected due to the sulfation enhancement by SO2 for Ce2(SO4)3.
. [J]. Frontiers of Chemical Science and Engineering, 2023, 17(10): 1399-1411.
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