The effect of loading on sintering and catalytic activity of Pt/SiO2 hybrid catalyst powders synthesized via spray pyrolysis

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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 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 high-temperature 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.
Publisher
KOREAN INSTITUTE CHEMICAL ENGINEERS
Issue Date
2014-11
Language
English
Article Type
Article
Keywords

MESOPOROUS MOLECULAR-SIEVES; CO OXIDATION; CARBON-MONOXIDE; PATTERN-FORMATION; NANOPARTICLES; PLATINUM; SURFACES; SUPPORT; RH; NANOCATALYSTS

Citation

KOREAN JOURNAL OF CHEMICAL ENGINEERING, v.31, no.11, pp.1980 - 1984

ISSN
0256-1115
DOI
10.1007/s11814-014-0144-x
URI
http://hdl.handle.net/10203/195147
Appears in Collection
EEW-Journal Papers(저널논문)
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