TY - JOUR
T1 - Self-Activated surface dynamics in gold catalysts under reaction environments
AU - Kamiuchi, Naoto
AU - Sun, Keju
AU - Aso, Ryotaro
AU - Tane, Masakazu
AU - Tamaoka, Takehiro
AU - Yoshida, Hideto
AU - Takeda, Seiji
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (A), grant no. 16H02074, a Grant-in-Aid for Young Scientists (B), grant no. 26870332, and “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT).
Publisher Copyright:
© 2018 The Author(s).
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.
AB - 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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U2 - 10.1038/s41467-018-04412-4
DO - 10.1038/s41467-018-04412-4
M3 - Article
C2 - 29802253
AN - SCOPUS:85047565349
VL - 9
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 2060
ER -