首页|Surface insights into MnOx-based catalysts containing metal oxides for the selective catalytic reduction of NOx with NH3
Surface insights into MnOx-based catalysts containing metal oxides for the selective catalytic reduction of NOx with NH3
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The MnOx/TiO2-based NOx reduction catalyst showed moderate performance at low temperature and had the disadvantage of low N2 selectivity.Herein,the effect of Sm and Ce interactions on MnOx-based catalysts in selective catalytic reduction was investigated.Sm increased the redox properties of the MnOx catalyst and the ratio of Mn~(4+).Meanwhile,Ce enhanced the additional redox trait of the Sm-modified catalyst.When exposed to SO2/O2,Sm and Ce-modified MnOx not only suppressed performance degradation,but also increased N2 selectivity.Sm and Ce suppress the formation of N2O by inhibiting the formation of N2O4 intermediate species.Additionally,regardless of exposure to SO2/O2,Sm/Ce modified MnOx is an LH-ER mechanism(Langmuir-Hinshelwood and Eley-Rideal mechanism),but in the case of MnOx,it is suggested to be mainly an ER mechanism when exposed to SO2/O2.From these results,a strategy for improving the N2 selectivity/SCR performance of MnOx/TiO2-based catalysts with SO2 resistance was provided.
MnOxNH3-SCRMechanismNOx reductionN2 selectivity
Dong Ho Kim、Yeon Jae Park、Kwan-Young Lee
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Extreme Materials Research Center,Korea Institute of Science and Technology,Seoul 02792,South Korea
Department of Chemical & Biological Engineering,Korea University,Seoul 02841,South Korea
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