Influence of Y Doping on Catalytic Activity of CeO2, MnOx, and CeMnOx Catalysts for Selective Catalytic Reduction of NO by NH3

Novel yttrium-doped CeO2, MnOx, and CeMnOx composites are investigated as catalysts for low-temperature NH3-SCR. The study involves the preparation of unmodified oxide supports using a citrate method followed by modification with Y (2 wt.%) two approaches, including one-pot incipient wetness impregnation undoped oxides. NH3-SCR reaction is studied in fixed-bed quartz reactor to test ability prepared NO reduction. gas mixture consists 800 ppm NO, NH3, 10 vol.% O2, He balance at WHSV 25,000 mL g−1 h−1. results indicate that mixed exhibits significantly higher deNOx performance compared Y-doped MnOx CeO2 catalysts. Indeed, yttrium presence promotes competitive NH3-SCO reaction, reducing amount NH3 available reduction lowering catalyst activity. Furthermore, physical-chemical properties nitrogen adsorption/desorption, XRD, Raman spectroscopy, temperature-programmed hydrogen, desorption ammonia. This presents promising approach enhancing low temperatures can have significant implications emissions.