Novel Ce-modified cobalt catalysts supported over α-Al2O3 open cell foams for lean methane oxidation
[EN] A series of CeO2-modified Co3O4 catalysts supported over alpha-Al2O3 foams was prepared by solution combustion synthesis and examined for the lean methane oxidation. Two different fuels were used namely, urea and glycine, with varying fuel/oxidiser (phi) ratio. The catalysts were characterised...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universidad del País Vasco |
| Repositorio: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/56562 |
| Acceso en línea: | http://hdl.handle.net/10810/56562 |
| Access Level: | acceso abierto |
| Palabra clave: | lean methane oxidation natural gas vehicles Ce-promoted cobalt catalysts open-cell ceramic foams solution combustion synthesis |
| Sumario: | [EN] A series of CeO2-modified Co3O4 catalysts supported over alpha-Al2O3 foams was prepared by solution combustion synthesis and examined for the lean methane oxidation. Two different fuels were used namely, urea and glycine, with varying fuel/oxidiser (phi) ratio. The catalysts were characterised by SEM-EDX, STEM-HAADF coupled to EDX mapping, ICP-AES, WDXRF, N-2 physisorption, XRD, HRTEM, Raman spectroscopy, XPS, H-2-TPR and CH4-TPRe, and their activity in the abatement of methane was analysed under realistic conditions. The use of glycine produced catalysts with significantly better morphological and structural properties. Likewise, a favoured insertion of cerium cations into the Co3O4 spinel lattice was observed, which caused a significant distortion of the spinel structure, thereby leading to a higher amount of mobile oxygen species capable of oxidising methane. These beneficial structural alterations were more pronounced with higher phi ratios. |
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