Catalytic oxidation of NO to NO2 on N-doped activated carbons

Nanostructured mesoporous carbons: Tuning texture and surface chemistry

“…This huge variety of oxygencontaining groups can be introduced onto the carbon material surface by treatment with oxidizing agents, either in the liquid phase (e.g., nitric acid, hydrogen peroxide, ammonium persulphate) or in the gas phase (e.g., with oxygen, ozone, nitrogen oxides) [110][111][112][113][114][115][116]. For liquid phase oxidation, a diluted or concentrated solution of the oxidizing agent is boiled in the presence of the carbon material.…”

Carbon Xerogel Catalyst for NO Oxidation

“…Mochida et al [38] found no relationship between surface area of the carbon materials and the removal of NO; however, the carbon materials used in this case were treated with sulphuric acid, and it is difficult to separate the effect of surface area and the effect of oxygen groups in the catalytic activity of carbon materials. Using nitrogen-doped carbon materials, the present authors did not find any correlation between NO conversion and surface area [8,39]. The carbon materials used in these works contained large amounts of nitrogen groups, which are known to enhance the activity of carbon materials in oxidation reactions [40][41][42].…”

“…The effect of oxygen in the removal of NO has been reported in many studies [7,[8][9][10]12]. In the absence of oxygen, NO passes through the carbon xerogel bed unreacted.…”

“…Activated carbons and activated carbon fibers have been recognized as effective catalysts for this reaction [7][8][9][10][11][12] as well as for SO 2 oxidation and NO-NH 3 reaction [13]. However, carbon materials in the form of monoliths or membranes are required for more advanced applications.…”

NH3-activated carbon nanofibers for low-concentration NO removal at room temperature

“…Hence, a highly efficient catalyst that can catalytically oxidize NO into NO 2 at room temperature is in great need. Carbon materials are the promising catalysts for the oxidation of NO into NO 2 [12,13], because activated carbon materials contain a large number of micropores and high surface area and NO dimerization can be enhanced by micropores [14], and activated carbon materials are superior adsorbent for NO at low temperature [15] and widely used as catalysts in the oxidation of NO [1,5,16,17].…”