Supplementary material
High Activity of Gold/Tin-Dioxide Catalysts for Low-Temperature CO
Oxidation: Application of a Reducible Metal Oxide to a Catalyst Support
Yasushi Maeda*, Tomoki Akita, Masanori Kohyama
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science
and Technology (AIST), 1-8-31, Midorigaoka, Ikeda, Osaka 563-8577, Japan
*Corresponding Author: y-maeda@aist.go.jp
Figure S1. A plot of the loading of Au measured by ICP-AES as a function of the atomic ratio of
Au/(Au+Sn) measured by XPS. The data were obtained for the Au/SnO2 catalysts with various Au
loadings ranging from 0.14 to 4.5 wt%. The estimation of the Au loading from XPS data was
performed using the calibration line shown in the figure.
Figure S2. CO conversion as a function of the temperature over the Au/SnO2 catalysts and a bare
SnO2 support (without Au). The An/SnO2 catalysts were prepared by the SG method, and the Au
loading was estimated to be 0.14–4.5 wt% by ICP-AES.
Figure S3. CO conversion as a function of the temperature over the Au/SnO2 catalysts prepared by
the SG method with various calcination temperatures (300–600 °C). The initial Au content in the SG
method was 1.2 wt%.
Figure S4. Dependence of the size of the Au particles on the Au loading for the Au/SnO2 catalysts:
(a) a plot of the average diameter of the Au particles as a function of the Au loading; (b) SEM images.
Figure S5. Dependence of the size of the Au particles on the calcination temperature for the Au/SnO2
catalysts: (a) a plot of the average diameter of the Au particles as a function of the calcination
temperature; (b) HAADF-STEM images.
Figure S6. CO conversion as a function of the temperature over the Au/SnO2 catalysts prepared by
the SG and DP methods. The initial Au content in both preparation methods was 1.2 wt%.
Table S1. List of materials used.
-----------------------------------------------------------------------Material
Supplier
Catalog No.
-----------------------------------------------------------------------SnO2
Kojundo Chem.
SNO06PB
Fe2O3
Kojundo Chem.
FEO05PB
Al2O3
Kojundo Chem.
ALO12PB
SiO2
Kojundo Chem.
SIO07PB
CeO2
Kojundo Chem.
CEO04PB
Co3O4
Kojundo Chem.
COO06PB
CuO
Kanto Chem.
07503-00
NiO
Kojundo Chem.
NIO04PB
SrTiO3
Kojundo Chem.
SRF07PB
ZnO
Kojundo Chem.
ZNO04PB
ZrO2
Nakalai Tesque
37021-45
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