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Ionics

, Volume 21, Issue 1, pp 221–229 | Cite as

Comparative study of aerogels nanostructured catalysts: Ni/ZrO2–SO4 2− and Ni/ZrO2–Al2O3–SO4 2−

  • N. Kamoun
  • M. K. Younes
  • A. Ghorbel
  • A. S. Mamede
  • A. Rives
Original Paper

Abstract

A series of Ni/ZrO2–SO4 2− and Ni/ZrO2–Al2O3–SO4 2− catalysts were prepared in one step by the sol–gel method and dried in hypercritical conditions of the solvent. The characteristic properties of those solids were investigated using many techniques: the XRD, the physisorption of N2, the IR, the UV–visible, and the X-ray photoelectron spectroscopy (XPS). Textural analysis reveals the mesoporosity of all the aerogel catalysts. Moreover, the addition of alumina to nickel sulfated zirconia at high calcination temperature increased twice the specific surface area, from 72 to 158 m2/g. XRD patterns show that nickel-promoted sulfated zirconia calcined at different temperature develops the tetragonal and the monoclinic ZrO2 phase, whereas the nickel sulfated zirconia alumina exhibits only the ZrO2 tetragonal phase. The addition of aluminum to nickel sulfated zirconia induces significant changes in symmetry of nickel by the migration of Ni ions from octahedral to tetrahedral coordination. XPS spectroscopy shows that the nickel in Ni/ZrO2–SO4 2− catalysts is more reducible than those in Ni/ZrO2–Al2O3–SO4 2−. Nickel sulfated zirconia catalyst exhibits higher activity than nickel sulfated zirconia alumina, in the n-hexane isomerization reaction.

Keywords

Isomerization Aluminum Sol–gel route Aerogel Sulfated zirconia Nickel 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • N. Kamoun
    • 1
  • M. K. Younes
    • 1
  • A. Ghorbel
    • 1
  • A. S. Mamede
    • 2
  • A. Rives
    • 3
  1. 1.Laboratoire de Chimie des Matériaux et Catalyse, Département de Chimie, Faculté des Sciences de TunisUniversité Tunis El ManarTunisTunisia
  2. 2.Unité de Catalyse et de Chimie du Solide UCCS, Université Lille Nord de France F-59000, CNRS UMR 8181, Ecole Nationale Supérieure de Chimie de LilleVilleneuve d’AscqFrance
  3. 3.Unité de Catalyse et de Chimie du Solide UCCS, Université Lille Nord de France F-59000, CNRS UMR 8181, Université Lille1Villeneuve d’AscqFrance

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