Porous silica as supports for controlled fabrication of Au/CeO2/SiO2 catalysts for CO oxidation: Influence of the silica nanostructures
| Autor: | Li-Hui Ren, Wen-Cui Li, An-Hui Lu, Hui-Li Zhang, Yan Hao |
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| Rok vydání: | 2012 |
| Předmět: |
geography
Materials science geography.geographical_feature_category Nanostructure Composite number Nanotechnology General Chemistry Condensed Matter Physics Catalysis Adsorption Chemical engineering Mechanics of Materials Colloidal gold General Materials Science Monolith Dispersion (chemistry) Space velocity |
| Zdroj: | Microporous and Mesoporous Materials. 158:7-12 |
| ISSN: | 1387-1811 |
| DOI: | 10.1016/j.micromeso.2012.03.010 |
| Popis: | Porous silica with different nanostructures, namely two-dimensional hexagonal SBA-15, three-dimensional cubic KIT-6 and hierarchical monolith silica (HMS), were used as supports to fabricate gold catalysts using a liquid-phase deposition–precipitation method. Pre-loading of ceria on porous silica can significantly improve the dispersion of the subsequently introduced gold nanoparticles and the catalytic activity of the final composite (Au/CeO2/SiO2) catalysts in CO oxidation. The composite catalysts were characterized by N2 adsorption, X-ray diffraction. The results indicate that different nanostructures of silica imposed significant influence on the catalytic activity of Au/CeO2/SiO2 catalysts. Gold catalyst supported on HMS exhibited the highest activity for the conversion of CO to CO2 with a complete conversion (T100%) at a temperature of 60 °C and at a space velocity of 80,000 mL gcat−1 h−1, whereas T100% shifted to 120–130 °C for SBA-15 and KIT-6 supported gold catalysts. |
| Databáze: | OpenAIRE |
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