Abstract
Abstract The selective reduction of NOx with ammonia on alumina-supported copper catalyst has been shown to be effective when NO2 (or O2) is present in the feed. Under steady state conditions, the presence of NO2 in the feed increases the overall rate of reduction of NOx by NH3 and simultaneously reduces its dependence on the oxygen concentration. As revealed by X-ray photoelectron Spectroscopy, the copper remains mainly as Cu+ species during on-stream. Such species results from the reduction of Cu2+ by the surface hydrogen produced via dissociative adsorption of ammonia. Some participation of NH4+ species, which arises from the interaction of a NH3 molecule and a Bronsted site, seem to be involved in the reduction of NO2 when present in the feed.
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