In Situ Redispersion of Platinum Autoexhaust Catalysts: An On‐Line Approach to Increasing Catalyst Lifetimes?

Abstract

Dynamic observation: The rapid oxidative redispersion of large Pt nanoparticles supported on ceria-based oxide in autoexhaust catalysts is demonstrated in the absence of Cl by in situ XANES analysis. An atomic migration model accounts for the observed redispersion through the trapping of Pt species at sites on the Ce support that exhibit strong interactions between the Pt oxide and the support.