NO reduction by CO over a Fe-based catalyst in FCC regenerator conditions

NO reduction by CO over a Fe-based catalyst in FCC regenerator conditions

Type	Journal Article
Author	Jun Li
Author	Shan Wang
URL	http://www.sciencedirect.com/science/article/pii/S1385894714007463
Volume	255
Pages	126-133
Publication	Chemical Engineering Journal
Date	November 1, 2014
Journal Abbr	Chemical Engineering Journal
Abstract	Presents a novel route for reduction of NOx by CO in the presence of an oxidization catalyst. O2 is first consumed by CO in the presence of oxidized catalyst. Then NO in the deoxidized flue gas is reduced by CO in the presence of reduced catalyst. Researchers studied the catalytic performance of a Fe-based catalyst as an oxidization catalyst for the reduction of NO by CO under typical FCC regeneration conditions. In comparison with the FCC catalyst, the Fe-based catalyst enhances a rapid consumption of O2, improving the reduction of NO by CO even at lower temperatures. A kinetics model was constructed to describe the effect of O2 concentration on the reduction of NO by CO. The reaction rate constant k increased with the temperature but decreased with the increase of O2 concentration. The CO–NO reaction will not occur until the O2 concentration is below a threshold value, which would be attributed to the stronger adsorption ability of O2 than NO.