The application of MnO x -CeO 2 as the low temperature selective catalytic reduction (SCR) catalyst to control NO x emission from coal-fired power plants is extremely restricted due to the unrecoverable deactivation by SO 2 . There is little SO 2 in the flue gas from biomass-fired power plants, and the concentration of alkali metals in the flue gas after the electrostatic precipitator is very low, so the application of MnO x -CeO 2 may be possible to control NO x emission from biomass-fired power plants. However, a very small amount of alkali metals showed a seriously negative effect on NO reduction over MnO x -CeO 2 such that both NO x conversion and N 2 selectivity obviously decreased. In this work, the mechanism of NO reduction over MnO x -CeO 2 and K-MnO x -CeO 2 was investigated by the transient reaction study and the kinetic parameters of NO reduction were obtained from the steady-state kinetic study. After comparison of the kinetic parameters, the mechanism of potassium deactivation on NO reduction over MnO x -CeO 2 was discovered. The decrease of the SCR activity of MnO x -CeO 2 after potassium deactivation was mainly attributed to the decrease of acid site and Mn 4+ concentration on the surface, and the increase of N 2 O selectivity was mainly related to the occurrence of N 2 O formation over K-MnO x -CeO 2 through the Langmuir–Hinshelwood mechanism.
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Xiong et al. (2016) studied this question.
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