关键词: 活性炭改性；Fe-Mn/AC, 低温脱硝；选择性还原催化剂

Abstract:

A series of Fe-Mn/AC catalysts were prepared by impregnation method with nitric acid, citric acid and oxygen plasma activated carbon and unmodified activated carbon as the carrier. The catalysts were characterized by N2 physical adsorption, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Effects of modification method on the denitrification performance of Fe-Mn/AC catalyst were studied. Results show that the modification method mainly improves the adsorption characteristics of NH3 by altering the number of C=O functional groups on the surface of activated carbon, thereby improving the low-temperature selective catalytic reduction (SCR) performance in denitrification reaction, without significant impact on active component Mn and Fe. The Fe-Mn/AC catalysts modified by nitric acid and citric acid have denitration rate about 95% at reaction temperature 120 ℃ and space velocity 8000 h-1. Hence, citric acid can be used for activated carbon modification instead of nitric acid to facilitate industrial production.

Key words: activated carbon modification, Fe-Mn/AC, low temperature denitrification, selective catalytic reduction catalyst