Unidirectional Electron Transfer on Bismuth-Doped Pt/YMn₂O₅ for Efficient CO Oxidation as Diesel Oxidation Catalysts

Abstract

Advanced fuel technology development requires exhaust after-treatment catalysts with low-temperature oxidation properties. For diesel oxidation catalysts (DOCs), reducing competitive oxidation at the key active site Pt in multicomponent exhaust gases (carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NO x )) is the most effective solution to this problem. Here, composite catalysts with multiple active centers of Pt/Bi 3+ -doped YMn 2 O 5 were prepared. And in a competing multicomponent diesel exhaust atmosphere, the complete conversion temperature (T 100 ) for CO oxidation of the Bi 3+ -doped catalysts was only 210 °C, resulting in a better low-temperature activity for the overall DOCs. In addition, even after severe hydrothermal aging, the T 100 of CO was only 235 °C. This is attributed to the unidirectional electron transfer present in the Pt−O−Bi structure that promotes the rapid oxidation of CO in the low-temperature region and reduces the competing adsorption between CO/HC/NO. Constructing such electron transfer channels to rapidly transform specific molecules provides valuable insights into solving multicomponent competitive reactions.