SELECTIVE CATALYTIC REDUCTION OF NITRIC-OXIDE BY AMMONIA ON FE3+-PROMOTED ACTIVE-CARBON

Selective catalytic reduction of nitric oxide by ammonia on Fe3+-promoted active carbons was investigated. The catalysts were prepared by the impregnation of active carbon (N/m) preoxidised with concentrated nitric acid at different temperatures. The amount of oxygen-containing surface groups on the supports was determined by infrared spectroscopy and X-ray photoelectron spectroscopy (XPS) while the distribution of active material was investigated using XPS. Catalytic activity of Fe3+-active carbon systems depended on the degree of the oxidation of the supports and pretreatment of the catalysts (drying, calcination in helium). The presence of oxygen in the reaction mixture enhanced the nitric oxide conversion. The catalysts showed a long-term stability.