A redox pathway for selective NOx reduction: stationary and transient experiments performed on a supported Pt catalyst Original Research Article

Platinum-based catalysts can perform the selective reduction of NOx under lean-burn conditions, though they function only over a narrow activity–temperature window and form undesirably high quantities of N2O. With these stationary and transient experiments conducted using a Pt/SiO2 catalyst, we attempted to better understand the mechanism of SCR NO when C3H6 is used as reductant. We propose a redox-type reaction pathway featuring NO adsorption as well as surface oxidation and reduction. To this end, a precise balance in hydrocarbon and oxygen surface coverage is required.