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Electronic parameters in cobalt-based perovskite-type oxides as descriptors for chemocatalytic reactions

Author

Listed:
  • Johannes Simböck

    (RWTH Aachen University
    RWTH Aachen University)

  • M. Ghiasi

    (Debye Institute for Nanomaterials Science, Utrecht University)

  • Simon Schönebaum

    (RWTH Aachen University
    RWTH Aachen University)

  • Ulrich Simon

    (RWTH Aachen University
    RWTH Aachen University)

  • Frank M. F. Groot

    (Debye Institute for Nanomaterials Science, Utrecht University)

  • Regina Palkovits

    (RWTH Aachen University
    RWTH Aachen University)

Abstract

Perovskite-type transition metal (TM) oxides are effective catalysts in oxidation and decomposition reactions. Yet, the effect of compositional variation on catalytic efficacy is not well understood. The present analysis of electronic characteristics of B-site substituted LaCoO3 derivatives via in situ X-ray absorption spectroscopy (XAS) establishes correlations of electronic parameters with reaction rates: TM t2g and eg orbital occupancy yield volcano-type or non-linear correlations with NO oxidation, CO oxidation and N2O decomposition rates. Covalent O 2p-TM 3d interaction, in ultra-high vacuum, is a linear descriptor for reaction rates in NO oxidation and CO oxidation, and for N2O decomposition rates in O2 presence. Covalency crucially determines the ability of the catalytically active sites to interact with surface species during the kinetically relevant step of the reaction. The nature of the kinetically relevant step and of surface species involved lead to the vast effect of XAS measurement conditions on the validity of correlations.

Suggested Citation

  • Johannes Simböck & M. Ghiasi & Simon Schönebaum & Ulrich Simon & Frank M. F. Groot & Regina Palkovits, 2020. "Electronic parameters in cobalt-based perovskite-type oxides as descriptors for chemocatalytic reactions," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-14305-0
    DOI: 10.1038/s41467-020-14305-0
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