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Fe–Ce Mixed Oxides Supported on Carbon Nanotubes for Simultaneous Removal of NO and Hg0 in Flue Gas

Ma, Yaguang, Zhang, Dingyuan, Sun, Huamin, Wu, Jiafeng, Liang, Peng, Zhang, Huawei
Industrial & engineering chemistry process design and development 2018 v.57 no.9 pp. 3187-3194
carbon nanotubes, catalysts, ceric oxide, cerium, ethanol, ferric oxide, flue gas, mercury, nanoparticles, nitric oxide, oxidation, oxygen, particle size, process design
Developing simultaneous removal technology of NOₓ and Hg⁰ in flue gas is highly desirable but remains challenging. Multiwalled carbon nanotube supported Fe–Ce mixed oxide nanoparticles (Fe₍₂₎Ce₍₀.₅₎Oₓ/MWCNTs) were prepared using the ethanol impregnation method for DeNOₓ and Hg⁰ removal. The NO and Hg⁰ removal efficiencies over catalyst reached to 99.1% and 88.9% at 240 °C and a space velocity of 30 000 h–¹. The Fe–Ce mixed oxides supported both inside and outside of MWCNTs in highly dispersed form with particle size of 3–5 nm. The Ce⁴⁺ existed on MWCNTs in two forms, some of which are the fluorite-like crystal CeO₂; the other portion of Ce⁴⁺ entered the spinel structure of γ-Fe₂O₃ and led to the distortion of the γ-Fe₂O₃ lattice. Furthermore, it is evident that the chemisorbed oxygen content and oxidation activity of catalysts increased dramatically after Ce doping, which could be attributed to the excellent NH₃-SCR and Hg⁰ removal performance.