Abstract
Selective catalytic reduction (SCR) of NO with NH3 was investigated using TiO2-supported Mn oxide catalysts prepared by wet impregnation at different MnO x loadings and reduction temperatures. The structures, valence states, and physicochemical properties were characterized using Brunauer–Emmett–Teller, X-ray diffraction, Raman, and X-ray photoelectron methods. The 20 wt% MnO x /TiO2 catalyst, which was rich in Mn4+ species, showed the best SCR activity and N2 selectivity at low temperatures. As the reduction temperature increased, the Mn valence states gradually changed from Mn4+ to Mn2+. When the valence state was lowered (Mn4+ to Mn2+), the SCR activity decreased significantly at low temperatures. H2 shut-off tests confirmed that the activity of the reduced catalyst was not fully recovered. For superior SCR activity at low temperatures, the MnO x species on the MnO x /TiO2 catalyst surface should be kept as Mn4+.
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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (No. 2010-0023963).
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Park, K.H., Lee, S.M., Kim, S.S. et al. Reversibility of Mn Valence State in MnOx/TiO2 Catalysts for Low-temperature Selective Catalytic Reduction for NO with NH3 . Catal Lett 143, 246–253 (2013). https://doi.org/10.1007/s10562-012-0952-8
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DOI: https://doi.org/10.1007/s10562-012-0952-8