AgY zeolite as catalyst for the selective catalytic oxidation of NH3
Joaquin Martínez-Ortigosa, Christian W. Lopes, Giovanni Agostini, A.E. Palomares, Teresa Blasco, Fernando Rey
Abstract
Ag-exchanged Y zeolites (Si/Al = 2.5; Ag/Al = 0.30–0.95) have been tested in the NH3–SCO reaction, the most promising method for the elimination of ammonia emissions, and deeply characterized before and after reaction by using a variety of techniques (XRD, TEM, UV–Vis, 109Ag NMR, XAS spectroscopies). The most active centres for the NH3–SCO reaction are Ag0 nanoparticles (NPs) formed under reduction conditions and both activity and selectivity to N2 increase with the silver loading. The Ag0 NPs are dramatically modified under reaction conditions, being most of them dispersed resulting in small clusters and even atomically Ag+ cations, the latter accounting for around half silver atoms. The presence of water into the reaction feed promotes the dispersion and oxidation of silver nanoparticles, but the catalyst performance is only slightly affected. The results are fully consistent with the previously proposed i-SCR mechanism for NH3–SCO reaction on silver catalysts.