Self-activated surface dynamics in gold catalysts under reaction environments

Naoto Kamiuchi, Keju Sun, Ryotaro Aso, Masakazu Tane, Takehiro Tamaoka, Hideto Yoshida and Seiji Takeda ()
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Naoto Kamiuchi: Osaka University
Keju Sun: Osaka University
Ryotaro Aso: Osaka University
Masakazu Tane: Osaka University
Takehiro Tamaoka: Osaka University
Hideto Yoshida: Osaka University
Seiji Takeda: Osaka University

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Nanoporous gold (NPG) with sponge-like structures has been studied by atomic-scale and microsecond-resolution environmental transmission electron microscopy (ETEM) combined with ab initio energy calculations. Peculiar surface dynamics were found in the reaction environment for the oxidation of CO at room temperature, involving residual silver in the NPG leaves as well as gold and oxygen atoms, especially on {110} facets. The NPG is thus classified as a novel self-activating catalyst. The essential structure unit for catalytic activity was identified as Au–AgO surface clusters, implying that the NPG is regarded as a nano-structured silver oxide catalyst supported on the matrix of NPG, or an inverse catalyst of a supported gold nanoparticulate (AuNP) catalyst. Hence, the catalytically active structure in the gold catalysts (supported AuNP and NPG catalysts) can now be experimentally unified in low-temperature CO oxidation, a step forward towards elucidating the fascinating catalysis mechanism of gold.

Date: 2018
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DOI: 10.1038/s41467-018-04412-4

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