Total degradation of p-hydroxybenzoic acid by Ru-catalysed wet air oxidation: a model for wastewater treatment
| Autor: | Francisco Medina, Zouhaier Ksibi, Tijani Hammedi, Jordi Llorca, Abdelhamid Ghorbel, R.J. Chimentão, Mohamed Triki, Mayra G. Álvarez |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Catalysts
Chemistry Batch reactor Catalitzadors Desenvolupament humà i sostenible::Enginyeria ambiental::Tractament de l'aigua [Àrees temàtiques de la UPC] chemistry.chemical_element CeO2–TiO2 Catalytic wet air oxidation Sol–gel Ruthenium Catalysis Chemisorption Environmental Chemistry Organic chemistry Física::Electromagnetisme [Àrees temàtiques de la UPC] Wet oxidation Leaching (metallurgy) Inductively coupled plasma Dispersion (chemistry) Nuclear chemistry |
| Zdroj: | Recercat. Dipósit de la Recerca de Catalunya instname UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| Popis: | Catalytic wet air oxidation using heterogeneous catalysts is a promising technology for treatment of wastewaters. Wastewaters from olive oil mills are difficult to clean because effluents contain high levels of phenolic compounds that cannot be removed by biological treatment or incineration. Therefore, we tested the catalytic wet air oxidation of p-hydroxybenzoic acid, as model molecule of olive oil mills wastewaters, over Ru-supported CeO2–TiO2 mixed oxides. We focussed on the Ce/Ti molar ratio because this ratio modifies the properties of the Ru catalysts. Supports were prepared by using the sol–gel method. The Ru catalysts were prepared by impregnation. Those products were characterized by N2 adsorption–desorption, X-ray diffraction, H2 chemisorption, transmission electron microscopy and inductively coupled plasma. Catalytic wet air oxidation of p-hydroxybenzoic acid was performed in a batch reactor at 140 °C and 50 bar of air. Our results show that the most efficient catalyst was Ru with a Ce/Ti ratio of 1/5, which converted totally p-hydroxybenzoic after 7 h of reaction without Ru leaching. We explain this finding by an enhanced dispersion of Ru due to better structural properties of the CeO2–TiO2 support.© 2015, Springer International Publishing Switzerland. |
| Databáze: | OpenAIRE |
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