Self-Activated surface dynamics in gold catalysts under reaction environments

Naoto Kamiuchi; Keju Sun; Ryotaro Aso; Masakazu Tane; Takehiro Tamaoka; Hideto Yoshida; Seiji Takeda

doi:10.1038/s41467-018-04412-4

Self-Activated surface dynamics in gold catalysts under reaction environments

Naoto Kamiuchi, Keju Sun, Ryotaro Aso, Masakazu Tane, Takehiro Tamaoka, Hideto Yoshida, Seiji Takeda

Research output: Contribution to journal › Article

15 Citations (Scopus)

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.

Original language	English
Article number	2060
Journal	Nature communications
Volume	9
Issue number	1
DOIs	https://doi.org/10.1038/s41467-018-04412-4
Publication status	Published - Dec 1 2018
Externally published	Yes

All Science Journal Classification (ASJC) codes

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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title = "Self-Activated surface dynamics in gold catalysts under reaction environments",

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.",

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AU - Kamiuchi, Naoto

AU - Sun, Keju

AU - Aso, Ryotaro

AU - Tane, Masakazu

AU - Tamaoka, Takehiro

AU - Yoshida, Hideto

AU - Takeda, Seiji

PY - 2018/12/1

Y1 - 2018/12/1

N2 - 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.

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