Conversion of NO on Co-impregnated active carbon catalysts Original Research Article

The NO conversion in a NO+ Ar gas mixture has been investigated on Coimpregnated active carbon catalysts in the absence of any added gasphase reducing agents. The catalysts obtained are very promising with respect to NO conversion because they are active at low temperatures (below 200 °C) and the only resulting product is N2. Up to 200 °C the pure active carbon used as a support exhibits no activity towards the process investigated. It has been found that the ratecontrolling step of NO conversion over active carbon supported Co catalysts is NO adsorption. NO conversion is catalysed by the cobaltoxide active phase. The mechanism of this process up to 200 °C presumably differs from that above this temperature where NO reduction proceeds with the participation of the active carbon. The surface oxides evolve as CO above 200 °C, playing the role of added gasphase reducing agent.