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Pt/MnO Interface Induced Defects for High Reverse Water Gas Shift Activity.

Imre Szenti1,2, Anastasiia Efremova1, János Kiss1,2

  • 1Department of Applied and Environmental Chemistry, University of Szeged, Interdisciplinary Excellence Centre, Rerrich Béla tér 1, 6720, Szeged, Hungary.

Angewandte Chemie (International Ed. in English)
|December 20, 2023
PubMed
Summary

Supported metal catalysts show enhanced performance through nanoparticle synergy. This study reveals Pt/MnO catalysts significantly boost reverse water gas shift (RWGS) reaction activity and CO selectivity due to interface-induced Pt lattice distortion.

Keywords:
Edge DislocationsLow CO StabilityManganese OxidePt/Mno InterfaceRWGS

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Supported metal catalysts are crucial for industrial processes.
  • Synergistic interactions between metal nanoparticles and supports enhance catalytic activity.
  • Interfacial sites play a key role in catalytic reactions.

Purpose of the Study:

  • To investigate the synergy between platinum (Pt) nanoparticles and manganese oxide (MnO) for the reverse water gas shift (RWGS) reaction.
  • To understand how interface-induced metal distortion affects catalyst performance.
  • To develop highly active and selective catalysts for industrial applications.

Main Methods:

  • Synthesis of Pt/MnO and Pt/SBA-15 catalysts.
  • Evaluation of catalytic activity and selectivity in the RWGS reaction.
  • Characterization using microscopy, surface-sensitive spectroscopy, and density functional theory (DFT) simulations.

Main Results:

  • The Pt/MnO catalyst exhibited approximately 10 times higher activity than the Pt/SBA-15 catalyst.
  • Achieved >99% CO selectivity in the RWGS reaction.
  • Identified interface-induced Pt lattice expansion and mismatched-row structure due to Pt (110) and MnO crystal assembly, weakening the Pt-CO bond.

Conclusions:

  • Interface-induced metal distortion in Pt/MnO catalysts significantly enhances RWGS reaction performance.
  • The weakened Pt-CO bond and rapid CO desorption are key factors for high activity and selectivity.
  • Pt/MnO represents a promising catalyst for crucial industrial processes.