Abstract
The sulfated Pt/Al2O3 catalyst was synthesized by impregnating H2SO4 on the Pt/Al2O3 catalyst. It exhibits higher catalytic activity than Pt/Al2O3 for soot oxidation under loose contact conditions in a feed flow containing NO and O2. Further studies ascribe its good activity to a synergistic effect between sulfate species and platinum. Firstly, the electronegative sulfate species may improve the oxidation-resistance of metallic platinum in the oxidizing atmosphere, which is important for achieving high NO↔NO2↔soot recycling efficiency; Secondly, the sulfate species inhibit the NOx adsorption on the alumina support, leading to a preferential adsorption of NOx on the surface of soot rather than on the catalyst, and thus provide more chances for NO2-soot reaction to generate the surface oxygenated complexes (SOCs); Finally, the sulfate species can promote the further decomposition of these SOCs species, resulting in a high catalytic efficiency for soot oxidation.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call