Journal of Sol-Gel Science and Technology

, Volume 48, Issue 3, pp 344–349 | Cite as

Ruthenium catalysts supported on TiO2 prepared by sol–gel way for p-hydroxybenzoic acid wet air oxidation

  • Mohamed Triki
  • Doan Pham Minh
  • Zouhaier Ksibi
  • Abdelhamid Ghorbel
  • Michèle Besson
Original Paper

Abstract

The wet air oxidation of p-hydroxybenzoic acid, chosen as a model compound of olive mills wastewaters was carried out at 140 °C and 50 bar air over Ru catalysts supported on TiO2 prepared by sol–gel method. These catalysts were characterized by means of N2 adsorption–desorption, XRD and TEM. Optimization of the catalytic performances was obtained by studying some parameters such as the catalyst preparation method, the solvent evacuation way, the nature of the hydrolysis agent, the influence of the ruthenium salt used as the metal precursor (Ru(NO)(NO3)3 or Ru(acac)3) and the catalyst pretreatment. The pre-calcination of the catalyst precursor at 300 °C under oxygen, before the reduction step under hydrogen, was detrimental to the activity. The results showed that the use of nitric acid as hydrolysis agent, drying under supercritical conditions and the use of Ru(NO)(NO3)3 leads to the more efficient catalyst with high TOC abatement.

Keywords

Ruthenium catalysts Mesoporous TiO2 Sol–gel Catalytic wet air oxidation p-Hydroxybenzoic acid 

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Mohamed Triki
    • 1
  • Doan Pham Minh
    • 2
  • Zouhaier Ksibi
    • 1
  • Abdelhamid Ghorbel
    • 1
  • Michèle Besson
    • 2
  1. 1.Laboratoire de Chimie des Matériaux et Catalyse (LCMC), Département de Chimie, Faculté des Sciences de TunisCampus UniversitaireTunisTunisie
  2. 2.Institut de Recherches sur la Catalyse et l’Environnement de Lyon (IRCELYON)CNRS UMR5256/Université Lyon 1Villeurbanne CedexFrance

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