Fe-modified hydroxyl-rich structured Pt/Fex/γ-Al2O3/Al catalyst for CO oxidationat room temperature: behavior and mechanism.

A structured anodic alumina-supported Pt and Fe composition catalyst was developed to investigate its catalytic performance in carbon monoxide (CO) oxidation reactions. It is found that the hydroxyl-rich structured Pt/Fe_x/γ-Al₂O₃/Al catalyst with a mass of 0.58 g achieved 100% removal of CO and exhibited good stability of 60 h by weakening the competition between CO and O₂ on the catalyst and decreasing the energy barrier. In addition, a series of explorations were carried out on the changes of relevant functional groups and active sites during catalyst deactivation and regeneration, and the data were explained in detail. Furtherly, it is demonstrated by in situ DRIFT that formate species are the important intermediates, produced by the reaction between hydroxyl group (–OH) on the catalyst and adsorbed CO. To explore the reaction mechanism at the atomic level, the CO oxidation reaction at the interface of Pt, Pt–OH, and Pt–Fe₂O₃ was analyzed by DFT calculations. [ABSTRACT FROM AUTHOR]