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Population and hierarchy of active species in gold iron oxide catalysts for carbon monoxide oxidation

Author

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  • Qian He

    (Lehigh University
    Oak Ridge National Laboratory
    Cardiff Catalysis Institute, School of Chemistry, Cardiff University)

  • Simon J. Freakley

    (Cardiff Catalysis Institute, School of Chemistry, Cardiff University)

  • Jennifer K. Edwards

    (Cardiff Catalysis Institute, School of Chemistry, Cardiff University)

  • Albert F. Carley

    (Cardiff Catalysis Institute, School of Chemistry, Cardiff University)

  • Albina Y. Borisevich

    (Oak Ridge National Laboratory
    Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge)

  • Yuki Mineo

    (Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University)

  • Masatake Haruta

    (Research Center for Gold Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University)

  • Graham J. Hutchings

    (Cardiff Catalysis Institute, School of Chemistry, Cardiff University)

  • Christopher J. Kiely

    (Lehigh University)

Abstract

The identity of active species in supported gold catalysts for low temperature carbon monoxide oxidation remains an unsettled debate. With large amounts of experimental evidence supporting theories of either gold nanoparticles or sub-nm gold species being active, it was recently proposed that a size-dependent activity hierarchy should exist. Here we study the diverging catalytic behaviours after heat treatment of Au/FeOx materials prepared via co-precipitation and deposition precipitation methods. After ruling out any support effects, the gold particle size distributions in different catalysts are quantitatively studied using aberration corrected scanning transmission electron microscopy (STEM). A counting protocol is developed to reveal the true particle size distribution from HAADF-STEM images, which reliably includes all the gold species present. Correlation of the populations of the various gold species present with catalysis results demonstrate that a size-dependent activity hierarchy must exist in the Au/FeOx catalyst.

Suggested Citation

  • Qian He & Simon J. Freakley & Jennifer K. Edwards & Albert F. Carley & Albina Y. Borisevich & Yuki Mineo & Masatake Haruta & Graham J. Hutchings & Christopher J. Kiely, 2016. "Population and hierarchy of active species in gold iron oxide catalysts for carbon monoxide oxidation," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12905
    DOI: 10.1038/ncomms12905
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