MnOx decorated VOx/CeO2 catalysts with preferentially exposed {110} facets for selective catalytic reduction of NOx by NH3
Abstract Highly dispersed MnOx decorated VOx/CeO2 catalysts with preferentially exposed {110} facets were chosen to improve the low temperature (200 250 degC) NH3 SCR activity. In this work, the catalytic data on NH3 SCR performance indicated that the improved catalytic activity were achieved when both VOx and MnOx were presented on the {110} facet of CeO2 nanorods. It could be deduced that the highly dispersed surface monomeric vanadium species were the reason for the high NH3 SCR activity from 51V Nuclear Magnetic Resonance (NMR) Raman, X ray diffraction (XRD) and Transmission electron microscopy (TEM) It was also suggested that CeO2{110} facet and surface oxygen vacancy defects had significant effects on the promotion of NH3 SCR performance. Furthermore, the redox cycle of V5+/V4+ and the quantities of NH3(L) species and bridging nitrate species were increased by the introduction of Mn. The Langmuir Hinshelwood mechanism is possible because abundant surface NH3(L) NH4+(B) and bridging nitrate species were produced as intermediates studied via in situ DRIFTs.