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Received March 21, 2014
Accepted May 21, 2014
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The effect of loading on sintering and catalytic activity of Pt/SiO2 hybrid catalyst powders synthesized via spray pyrolysis
Jaecheol Yun1 2
Chan-Ho Jung3 4
Dahee Park1
Hye Young Koo1
Jung-Yeul Yun1
Yangdo Kim2†
Jeong Young Park3 4†
1Powder Technology Department, Korea Institute of Materials Science (KIMS), Changwon 642-831, Korea 2Department of Material Science and Engineering, Pusan National University, Busan 607-735, Korea 3Center for Nanomaterials and Chemical Reactions, Institute for Basic Science (IBS), Daejeon 305-701, Korea 4Graduate School of EEWS, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea
Korean Journal of Chemical Engineering, November 2014, 31(11),
10.1007/s11814-014-0144-x
10.1007/s11814-014-0144-x
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Abstract
Platinum (Pt) is commonly used as a heterogeneous catalyst to effectively convert carbon monoxide (CO) from automobile exhaust gas into carbon dioxide (CO2). Platinum/silica (Pt/SiO2) hybrid catalyst powders with varying Pt content were synthesized via a spray pyrolysis process. The average particle size and specific surface area of the Pt nanoparticles on the Pt/SiO2 hybrid catalyst powders were characterized as-prepared and after heat treatment. As_x000D_
the Pt loading increased, the Pt nanoparticles grew on the surface of the SiO2 as a result of sintering, and the catalytic efficiency decreased. This work demonstrates that the Pt/SiO2 (4 wt% Pt) hybrid catalyst powder is suitable as a hightemperature automobile exhaust catalyst, compared with the Pt/SiO2 hybrid catalyst powder with high Pt loading (14 wt% Pt), indicating that metal nanoparticle loading is a key factor for determining catalytic activity.
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Kim M, Bertram M, Pollmann M, Oertzen AV, Mikhailov AS, Rotermund HH, Ertl G, Science, 292, 1357 (2001)
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