CO oxidation activity of non-reducible oxide-supported mass-selected few-atom Pt single-clusters

Atsushi Beniya (), Shougo Higashi (), Nobuko Ohba, Ryosuke Jinnouchi, Hirohito Hirata and Yoshihide Watanabe
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Atsushi Beniya: Toyota Central R&D Labs, Inc.
Shougo Higashi: Toyota Central R&D Labs, Inc.
Nobuko Ohba: Toyota Central R&D Labs, Inc.
Ryosuke Jinnouchi: Toyota Central R&D Labs, Inc.
Hirohito Hirata: Toyota Motor Corporation
Yoshihide Watanabe: Toyota Central R&D Labs, Inc.

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Platinum nanocatalysts play critical roles in CO oxidation, an important catalytic conversion process. As the catalyst size decreases, the influence of the support material on catalysis increases which can alter the chemical states of Pt atoms in contact with the support. Herein, we demonstrate that under-coordinated Pt atoms at the edges of the first cluster layer are rendered cationic by direct contact with the Al2O3 support, which affects the overall CO oxidation activity. The ratio of neutral to cationic Pt atoms in the Pt nanocluster is strongly correlated with the CO oxidation activity, but no correlation exists with the total surface area of surface-exposed Pt atoms. The low oxygen affinity of cationic Pt atoms explains this counterintuitive result. Using this relationship and our modified bond-additivity method, which only requires the catalyst–support bond energy as input, we successfully predict the CO oxidation activities of various sized Pt clusters on TiO2.

Date: 2020
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DOI: 10.1038/s41467-020-15850-4

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