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Catalytic wet hydrogen peroxide oxidation of p-hydroxybenzoic acid over Fe/TiO2 and 0.5Ru–3Fe/TiO2

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Abstract

p-Hydroxybenzoic acid (p-HBZ) degradation was achieved using catalytic wet hydrogen peroxide oxidation over Fe/TiO2 and Ru–Fe/TiO2 under mild conditions. The results showed that 71 % of p-HBZ conversion was obtained after 10 min of reaction over the 0.5Ru–3Fe/TiO2 catalyst calcined under oxygen. The influence of the H2O2/p-HBZ molar ratio (5:1, 10:1 and 15:1), reaction temperature (25, 40 and 60 °C), Fe loading (1, 2 and 3 wt%) and thermal treatment was studied. Characterization studies were performed by X-ray diffraction, N2 physisorption at 77 K, H2-TPR and elemental analysis, showing that close interaction between Ru and iron oxide species is necessary to obtain active and stable catalysts.

Graphical Abstract

0.5Ru–3Fe/TiO2 C catalyst shows a high activity for the degradation of p-HBZ at 60 °C by CWHPO in the presence of H2O2. The system could be considered as a Fenton-like reaction due to the generation of radicals from H2O2 as well as the presence of iron sites on the catalyst.

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Acknowledgments

Authors acknowledge the financial support from the Spanish Government’s Ministry of Economy and Competitiveness (Project CTQ2012-35789). F. Medina thanks the Generalitat de Catalunya for the ICREA Academia Award.

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Correspondence to Tijani Hammedi.

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Hammedi, T., Triki, M., Ksibi, Z. et al. Catalytic wet hydrogen peroxide oxidation of p-hydroxybenzoic acid over Fe/TiO2 and 0.5Ru–3Fe/TiO2 . J Sol-Gel Sci Technol 76, 679–685 (2015). https://doi.org/10.1007/s10971-015-3820-3

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  • DOI: https://doi.org/10.1007/s10971-015-3820-3

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