TY - JOUR
T1 - CO oxidation performance of Au/Co3O4 catalyst on the micro gas sensor device
AU - Nishibori, M.
AU - Shin, W.
AU - Izu, N.
AU - Itoh, T.
AU - Matsubara, I.
N1 - Funding Information:
The authors are grateful to Dr. Y. Masuda of the AIST for XPS analysis. The synchrotron radiation experiments were performed at the BL14B2 in the SPring-8 (2010A1837). The authors are thankful to the Aichi Prefectural Government, Science and Technology Section. This work was partially supported by the Japan Science and Technology Agency (JST), Adaptable and Seamless Technology transfer Program though target-driven R&D (A-STEP).
PY - 2013/3/1
Y1 - 2013/3/1
N2 - The CO oxidation performance of the Au/Co3O4 catalyst on the micro gas sensor device with different treatment conditions has been investigated. The CO oxidation performance of the Au/Co3O4 catalyst on the micro device has been improved by the H2 combustion treatment under the flow of H2 in air and the reduction treatment under the flow of H2 in N2. The H2 combustion treatment of the Au/Co3O4 catalyst on the micro device prevented the degradation of the CO oxidation performance. To investigate the chemical states and microstructures of Au and Co in the Au/Co3O 4 catalysts after the reduction and H2 combustion treatments, transmission X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS) have been performed. Au particles of Au/Co3O4 were found to be metallic Au regardless of the treatment conditions. However, a hydroxyl group bonded to the transition metal Co as a form of Co(OH)2 was found on the catalyst surface after the H2 combustion treatment. The H2 combustion treatment of Au/Co3O4 results in the formation of OH- in the metal-support interface, which is considered to be an origin of the improvement of the CO oxidation performance of the Au/Co3O4 catalyst.
AB - The CO oxidation performance of the Au/Co3O4 catalyst on the micro gas sensor device with different treatment conditions has been investigated. The CO oxidation performance of the Au/Co3O4 catalyst on the micro device has been improved by the H2 combustion treatment under the flow of H2 in air and the reduction treatment under the flow of H2 in N2. The H2 combustion treatment of the Au/Co3O4 catalyst on the micro device prevented the degradation of the CO oxidation performance. To investigate the chemical states and microstructures of Au and Co in the Au/Co3O 4 catalysts after the reduction and H2 combustion treatments, transmission X-ray absorption fine structure (XAFS) measurement and X-ray photoelectron spectroscopy (XPS) have been performed. Au particles of Au/Co3O4 were found to be metallic Au regardless of the treatment conditions. However, a hydroxyl group bonded to the transition metal Co as a form of Co(OH)2 was found on the catalyst surface after the H2 combustion treatment. The H2 combustion treatment of Au/Co3O4 results in the formation of OH- in the metal-support interface, which is considered to be an origin of the improvement of the CO oxidation performance of the Au/Co3O4 catalyst.
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U2 - 10.1016/j.cattod.2012.04.037
DO - 10.1016/j.cattod.2012.04.037
M3 - Article
AN - SCOPUS:84870846317
SN - 0920-5861
VL - 201
SP - 85
EP - 91
JO - Catalysis Today
JF - Catalysis Today
IS - 1
ER -