Synthesis and catalytic properties of CeO2 and Co/CeO2 nanofibres for diesel soot combustion
| Autor: | Nunzio Russo, Raffaele Pirone, Pullur Anil Kumar, Debora Fino, Manju Dhakad Tanwar |
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| Rok vydání: | 2012 |
| Předmět: |
Morphology
Diesel exhaust Materials science Combustion chemistry.chemical_element Nanotechnology General Chemistry Diesel soot medicine.disease_cause complex mixtures Catalysis Soot Nanofibre chemistry.chemical_compound Ceria chemistry X-ray photoelectron spectroscopy Chemical engineering medicine Thermal stability Citric acid Cobalt |
| Zdroj: | Catalysis Today. 184:279-287 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2011.12.025 |
| Popis: | CeO2 nanofibres have been prepared by means of the co-precipitation and ripening method. The morphology of the CeO2 and the synthesis duration were influenced by changes in the mole ratio of the NaOH/citric acid. Three kinds of precipitates were obtained by increasing the NaOH/citric acid ratio: stuck-in-bundle, fibre and flake morphologies. The cobalt was impregnated on the prepared CeO2 (0.8) nanofibres and the physico-chemical properties, soot combustion activities and deactivation were investigated. The Co/CeO2 (0.8) nanofibres were evaluated for soot combustion in O2 and NO/O2. The morphology of the fibrous structure of CeO2 (0.8) and Co/CeO2 (0.8) was observed through FE SEM images. The presence of cobalt in Co3O4 form was confirmed by means of XRD and TPR analyses. The Co/CeO2 (0.8) fibre catalysts showed improvements in soot combustion at low temperatures of around 400 °C with 10% O2 and a decrease in the peak soot combustion temperature at about 40 °C was observed with the addition of 500 ppm NO. The XPS results of the Co 2p spectra of the Co/CeO2 (0.8) catalysts confirmed the presence of Co in the Co3+, Co2+ oxidation states. The thermal stability and the resistance to SO2 poisoning of the 10% Co/CeO2 (0.8) fibre catalyst were examined by ageing it in air and 1030 ppm SO2 at 800 °C for 12 h. |
| Databáze: | OpenAIRE |
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