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• W2017117497 abstract "Abstract The effect of H 2 O and SO 2 on the catalytic activity of manganese oxides supported on multi-walled carbon nanotubes (MnO x /MWCNTs) for low-temperature selective catalytic reduction (SCR) of NO x with NH 3 was studied. Also, N 2 adsorption, transient response experiments, X-ray powder diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FT-IR) spectroscopy and in situ FT-IR spectroscopy were performed to investigate the deactivation mechanism of MnO x /MWCNTs catalyst in the presence of H 2 O or SO 2 . Experimental results showed that H 2 O had a reversible negative effect on the catalytic activity of the catalyst. When the temperature was higher than 270 °C, the effect of H 2 O could be negligible. The competitive adsorption of H 2 O and NH 3 on the Lewis acid sites contributed to the deactivation of the catalyst. The integrity increase of MWCNTs in the presence of H 2 O might be another reason for the deactivation of the catalyst. However, SO 2 led to the irreversible deactivation of the catalyst. The higher the reaction temperature, the more dramatically the catalystic activity decreased. The sulfation of the active center atoms was the main poisoning route. Also, formation of ammonium sulfates on the catalyst surface and the competitive adsorption between SO 2 and NO were responsible for the partial deactivation of the catalyst to some extent." @default.
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• W2017117497 date "2013-10-01" @default.
• W2017117497 modified "2023-10-16" @default.
• W2017117497 title "H2O and SO2 deactivation mechanism of MnOx/MWCNTs for low-temperature SCR of NOx with NH3" @default.
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• W2017117497 doi "https://doi.org/10.1016/j.molcata.2013.05.009" @default.
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