Dynamic behaviour of platinum and copper dopants in gold nanoclusters supported on ceria catalysts

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Autoren

  • Nicole Müller
  • Banu Rares
  • Adea Loxha
  • Ernst Pittenauer
  • Jordi Llorca
  • Janis Timoshenko
  • Carlo Marini
  • Noelia Barrabés

Externe Organisationseinheiten

  • Technische Universität Wien
  • Universitat Politècnica de Catalunya
  • Fritz Haber Institute of the Max Planck Society, Berlin
  • ALBA Synchrotron Light Facility

Abstract

Understanding the behaviour of active catalyst sites at the atomic level is crucial for optimizing catalytic performance. Here, the evolution of Pt and Cu dopants in Au25 clusters on CeO2 supports is investigated in the water-gas shift (WGS) reaction, using operando XAFS and DRIFTS. Different behaviour is observed for the Cu and Pt dopants during the pretreatment and reaction. The Cu migrates and builds clusters on the support, whereas the Pt creates single-atom active sites on the surface of the cluster, leading to better performance. Doping with both metals induces strong interactions and pretreatment and reaction conditions lead to the growth of the Au clusters, thereby affecting their catalytic behaviour. This highlights importance of understanding the behaviour of atoms at different stages of catalyst evolution. These insights into the atomic dynamics at the different stages are crucial for the precise optimisation of catalysts, which ultimately enables improved catalytic performance.

Details

OriginalspracheEnglisch
Aufsatznummer277
Seitenumfang10
FachzeitschriftCommunications chemistry
Jahrgang2023
Ausgabenummer6
DOIs
StatusVeröffentlicht - 18 Dez. 2023