Catalytic Soot Oxidation Activity of NiO–CeO2 Catalysts Prepared by a Coprecipitation Method: Influence of the Preparation pH on the Catalytic Performance
| Autor: | Daniel Goma, Miguel A. Cauqui, Amar Bendieb Aberkane, María Pilar Yeste, Djazi Fayçal |
|---|---|
| Přispěvatelé: | Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Coprecipitation chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences lcsh:Technology Catalysis nickel General Materials Science lcsh:Microscopy lcsh:QC120-168.85 mixed oxides lcsh:QH201-278.5 lcsh:T Non-blocking I/O coprecipitation soot oxidation 021001 nanoscience & nanotechnology 0104 chemical sciences Cerium cerium chemistry Transmission electron microscopy lcsh:TA1-2040 Inductively coupled plasma atomic emission spectroscopy Mixed oxide lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 Nuclear chemistry BET theory |
| Zdroj: | Materials, Vol 12, Iss 20, p 3436 (2019) Materials Volume 12 Issue 20 Materials 2019, 12(20), 3436 RODIN. Repositorio de Objetos de Docencia e Investigación de la Universidad de Cádiz instname |
| ISSN: | 1996-1944 |
| Popis: | A series of NiO&ndash CeO2 mixed oxide catalysts have been synthesized by a modified coprecipitation method at three different pH values (pH = 8, 9, and 10). The NiO&ndash CeO2 mixed oxide samples were characterized by TGA, XRD, inductively coupled plasma atomic emission spectroscopy (ICP-AES), FTIR, Brunauer&ndash Emmett&ndash Teller (BET) surface area, H2 temperature-programmed reduction (H2-TPR), and electron microscopy (high-angle annular dark-field transmission electron microscopy/energy-dispersive X-ray spectroscopy (HAADF-TEM/EDS)). The catalytic activities of the samples for soot oxidation were investigated under loose and tight contact conditions. The catalysts exhibited a high BET surface area with average crystal sizes that varied with the pH values. Electron microscopy results showed the formation of small crystallites (~5 nm) of CeO2 supported on large plate-shaped particles of NiO (~20 nm thick). XRD showed that a proportion of the Ni2+ was incorporated into the ceria network, and it appeared that the amount on Ni2+ that replaced Ce4+ was higher when the synthesis of the mixed oxides was carried out at a lower pH. Among the synthesized catalysts, Ni-Ce-8 (pH = 8) exhibited the best catalytic performance. |
| Databáze: | OpenAIRE |
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