AgY zeolite as catalyst for the selective catalytic oxidation of NH3

Ag-exchanged Y zeolites (Si/Al = 2.5; Ag/Al 0.30–0.95) have been tested in the NH 3 –SCO reaction, most promising method for elimination of ammonia emissions, and deeply characterized before after reaction by using a variety techniques (XRD, TEM, UV–Vis, 109 Ag NMR, XAS spectroscopies). The active centres are 0 nanoparticles (NPs) formed under reduction conditions both activity selectivity to N 2 increase with silver loading. NPs dramatically modified conditions, being them dispersed resulting small clusters even atomically + cations, latter accounting around half atoms. presence water into feed promotes dispersion oxidation nanoparticles, but catalyst performance is only slightly affected. results fully consistent previously proposed i-SCR mechanism on catalysts. • Silver AgNaY hydrogen sites reaction. conversion increases species change during course identified