Conversion of NO on Co-impregnated active carbon catalysts

✍ Scribed by D. Mehandjiev; M. Khristova; E. Bekyarova

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 531 KB
• Volume: 34
• Category: Article
• ISSN: 0008-6223
• DOI: 10.1016/0008-6223(96)00015-2

✦ Synopsis

The NO conversion in a NO + Ar gas mixture has been investigated on Co-impregnated active carbon catalysts in the absence of any added gas-phase 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 N,. 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 rate-controlling step of NO conversion over active carbon supported Co catalysts is NO adsorption. NO conversion is catalysed by the cobalt-oxide 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 2Oo"C, playing the role of added gas-phase reducing agent.