Low-temperature selective catalytic reduction of NO with NH based on MnO-CeO/ACFN

Abstract

MnO_x-CeO_x/ACFN were prepared by the impregnation method and used as catalyst for selective catalytic reduction of NO with NH₃ at 80°C–150°C. The catalyst was characterized by N₂-BET, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). The fraction of the mesopore and the oxygen functional groups on the surface of activated carbon fiber (ACF) increased after the treatment with nitric acid, which was favorable to improve the catalytic activities of MnO_x-CeO_x/ACFN. The experimental results show that the conversion of NO is nearly 100% in the range 100°C–150°C under the optimal preparation conditions of MnO_x-CeO_x/ACFN. In addition, the effects of a series of performance parameters, including initial NH₃ concentration, NO concentration and O₂ concentration, on the conversion of NO were studied.

Keywords

low-temperature SCR / MnO_x-CeO_x/ACFN / NO conversion / mesopore fraction / oxygen functional group