Catalytically oxidation of NO into NO2 at room temperature by graphitized porous nanofibers

Activated carbon nanofibers (ACNFs) were firstly fabricated by stabilizing, carbonizing and activating electrospun-derived polyacrylonitrile (PAN) nanofibers. Then the graphite carbon nanofibers (GPNF-1900, GPNF-2400) were achieved by graphitization at 1900 °C and 2400 °C. The GPNFs and ACNFs were characterized by SEM, FTIR, Raman and nitrogen adsorption at 77 K. The adsorption and oxidation of NO at room temperature (30 °C) were investigated. The results showed that GPNF with porous graphitic structure can improve dramatically the catalytic oxidation of NO at room temperature. The steady conversion ratio of NO to NO2 over the ACNFs, GPNF-1900 and GPNF-2400 was 11%, 38%, 45%, respectively, which revealed that GPNFs would be promising catalysts in catalytic oxidation of NO at room temperature.

Figure optionsDownload high-quality image (221 K)Download as PowerPoint slideHighlights
► Graphitized porous nanofibers (GPNFs) were prepared by electrospining method.
► NO can be catalytically oxidized into NO2 over GPNF at ambient temperature.
► The NO oxidation mechanism over Graphitized porous nanofibers was investigated.