It led to more abundant Pt0 species in the lower layer, which was favorable for oxidizing the diffused NH3 efficiently into N2, H2O and a part of NOx. It was ascribed to a preferable synergistic effect between the upper layer of VOx species and the lower layer of Pt species supported on TiO2. V0.5/Pt0.04/TiO2 catalyst exhibited outstanding NH3-SCO performance, which obtained complete NH3 conversion and 80.2 % of N2 selectivity at 225 ✬. The catalytic performance of Pt-V system significantly depended on the combination mode between VOx and Pt species. Herein the influence of deposition order of V and Pt components on NH3-SCO performance was investigated with constant loadings of 0.5 wt.% V and 0.04 wt.% Pt. But it is challenging to improve NH3 conversion activity and N2 selectivity, as well as cost-economy. Pt-V bimetallic catalytic system maybe a promising alternative to noble metal catalysts for selective catalytic oxidation (SCO) of NH3.
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