Microwave-assisted catalytic wet peroxide oxidation. Comparison of Fe catalysts supported on activated carbon and Γ-alumina
This paper studies the role of the catalytic support on microwave-assisted catalytic wet peroxide oxidation (MW-CWPO) with Fe as active phase. Experiments were carried out with and without MW using catalysts of Fe on activated carbon (Fe/AC) and gamma alumina (Fe/γ-Al2O3). Phenol (100 mg·L−1) was us...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2017 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/717807 |
| Acceso en línea: | http://hdl.handle.net/10486/717807 https://dx.doi.org/10.1016/j.apcatb.2017.06.058 |
| Access Level: | acceso abierto |
| Palabra clave: | CWPO Fe/AC Fe/γ-Al2O3 hot spot microwave Química |
| Sumario: | This paper studies the role of the catalytic support on microwave-assisted catalytic wet peroxide oxidation (MW-CWPO) with Fe as active phase. Experiments were carried out with and without MW using catalysts of Fe on activated carbon (Fe/AC) and gamma alumina (Fe/γ-Al2O3). Phenol (100 mg·L−1) was used as target pollutant, operating at pH 3, 120 °C, 100 mg·L−1 catalyst concentration and the theoretical stoichiometric amount of H2O2 (500 mg·L−1). MW radiation promotes hot spot formation on the surface of AC, enhancing HOX[rad] generation, so that the rate of mineralization is significantly increased with respect to non-assisted CWPO. Under these conditions, phenol oxidation proceeded essentially through direct aromatic ring breakdown, yielding carboxylic acids, while the formation of the highly toxic intermediates hydroquinone and p-benzoquinone were barely detected. The Fe/AC catalyst showed a better performance than the Fe/γ-Al2O3 one, which can be explained by the much higher MW absorption on AC, which, in f |
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