Preparation of MnO₂/CNFs by Liquid Phase Coprecipitation Method and Its Performance in Low-temperature Denitrification

Abstract

Based on CNFs supports, a series of MnO2/CNFs catalysts were synthesized by a liquid phase coprecipitation method, and it was applied to selective catalytic reduction (SCR) of NO. The microstructure, elemental composition, and valence state of the as-obtained catalysts were characterized by BET, XRD, FESEM, EDS, XPS and TEM. The results show that MnO2 is distributed on the surface of CNFs with amorphous form equably as the active components. MnO2/CNFs catalyst shows up the best activity in the test of SCR at the testing temperature range of 80-180℃, when the loading amount is 6%. NO transformation rate is 65.25% at 80℃, and 95.25% at 180℃. Amorphous structure, favorable dispersion and higher content of surface oxide are the main cause of MnO2/CNFs's excellent catalytic activity at low temperature. MnO2 is loaded on the CNFs without any acid-treated, which makes it more environment-friendly.

Keywords

• liquid-phase coprecipitation method
• MnO₂/CNFs catalyst
• denitrification
• low-temperature selective catalytic reduction
• carbon nanofiber