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Highly Efficient Mesoporous Mg/γ-Al2O3 Catalysts for Ozonation of Saline Petroleum Effluents

Authors
  • Xu, Renshun1
  • Nabet, Hervé2
  • Breton, Audrey2
  • Baldoni-Andrey, Patrick2
  • Lesage, Nicolas2
  • Cacciaguerra, Thomas1
  • Hulea, Vasile1
  • Fajula, Francois1
  • Galarneau, Anne1
  • 1 Institut Charles Gerhardt Montpellier – Univ Montpellier- CNRS – ENSCM, Montpellier, France , Montpellier (France)
  • 2 TOTAL SA, Pole d’Etudes et de Recherche de Lacq, Lacq, France , Lacq (France)
Type
Published Article
Journal
Petroleum Chemistry
Publisher
Pleiades Publishing
Publication Date
Aug 29, 2020
Volume
60
Issue
8
Pages
858–880
Identifiers
DOI: 10.1134/S0965544120080150
Source
Springer Nature
Keywords
License
Yellow

Abstract

Abstractγ-Al2O3 is promising for catalytic ozonation because it produces HO° radicals. To improve its basicity and/or its oxidative character, highly mesoporous γ-Al2O3 was doped with different metals M alone or in mixture (M = Mg, Ca, Zn, Fe, Ba, Zr, Cu, Co, Ni, Ce, Ti, with 0.05 < M/Al < 0.5 molar ratio) prepared either by incipient wetness deposition or by direct sol-gel. Tests to determine the basic and oxidative character of the catalysts have been set up. Results show that Mg-doped alumina materials exhibited the highest basicity and Cu,Mg-doped alumina materials the highest oxidative character. These materials (5 g/L) were tested in the catalytic ozonation of a synthetic saline (NaCl = 50 g/L) petroleum effluent such as produced water (TOC = 216 mg/L) containing phenols, acetic acid and polycyclic aromatic hydrocarbons. Among these catalysts, Mg-doped alumina with molar ratio Mg/Al = 0.1, 0.2 prepared by incipient wetness deposition were the more efficient catalysts. Under reuse the Mg-doped alumina catalyst (Mg/Al = 0.1) exhibited the highest ozonation rate with 98% TOC removal in 5 h. This remarkable behavior was attributed to the in-situ formation during ozonation of spinel (MgAl2O4) nanoparticles at the surface of Mg-doped alumina particles.

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