Iron-alumina synergy in the heterogeneous Fenton-type peroxidation of phenol solutions
Highly dispersed Fe2O3/Al2O3 catalysts (0.5–4 wt% Fe) were prepared by incipient wetness impregnation of iron citrate over a mesoporous alumina host. Their structural and textural properties were determined by N2 adsorption–desorption at −196 °C, XRD, TEM, SEM–EDAX, Raman and XPS. The structure of t...
| Autores: | , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2015 |
| País: | Argentina |
| Recursos: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/30040 |
| Acesso em linha: | http://hdl.handle.net/11336/30040 |
| Access Level: | acceso abierto |
| Palavra-chave: | Fe–Al2o3 Mesoporous Alumina Cwhpo Phenol Heterogeneous Fenton-Like Systems https://purl.org/becyt/ford/2.4 https://purl.org/becyt/ford/2 |
| Resumo: | Highly dispersed Fe2O3/Al2O3 catalysts (0.5–4 wt% Fe) were prepared by incipient wetness impregnation of iron citrate over a mesoporous alumina host. Their structural and textural properties were determined by N2 adsorption–desorption at −196 °C, XRD, TEM, SEM–EDAX, Raman and XPS. The structure of the catalytic materials resulted similar to the γ-Al2O3 support, exhibiting high dispersion levels of the iron oxide active phase with a narrow pore size distribution in the range of 2–7 nm and high surface areas. The capability of these systems as efficient and active Fenton-like catalysts, were further tested for the catalytic oxidation of concentrated phenol solutions (5 g/L) with H2O2 at 70 °C in a batch reactor. The effects of iron concentration, catalyst concentration and the nature of the support were evaluated, under adjusted sub-stoichiometric oxidant concentration. Besides the positive impact of increasing the iron loading, a synergistic effect between Fe and Al species would be possibly responsible of the improvements observed using higher iron dispersions and/or support concentrations. The catalytic performance of these alumina-based catalysts resulted very promissory as they yielded: total phenol abatement, high mineralization levels (up to a maximum of 80%) and high oxidant consumption efficiencies (between 80% and 96%). |
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