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Effects of alkaline earth metals on the surface, structure, and reactivity of α-alumina

  • Madani GhelamallahEmail author
  • Soufi Kacimi
  • Pascal Granger
ICCESEN 2017
  • 97 Downloads
Part of the following topical collections:
  1. Geo-Resources-Earth-Environmental Sciences

Abstract

A series of strontium- and barium-doped alumina samples were prepared by hydrolysis, in neutral medium, starting from commercial Al2O3, SrCO3, and BaCO3 materials. The precursors thus obtained were calcined under air at 700 °C; then, the bulk and surface properties of the resulting mixed oxides were characterized by nitrogen physisorption, X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H2-TPR), thermogravimetry (TGA), and differential thermal analysis (DTA). Contrary to SrCO3, an addition of BaCO3 to α-Al2O3 increases slightly the specific surface area. XRD patterns essentially reveal the characteristic reflections assigned to α-Al2O3. In agreement with TGA and XRD analysis, strontium and barium carbonates remain after calcination at 700 °C, their decomposition starting above 800 °C. Let us note that this decomposition occurs more readily on AlSr-100 than on AlBa-100 with no apparent relationship with the evolution observed on the specific surface areas. H2-TPR experiments underline a significant bulk reduction of barium and strontium carbonates taking place significantly above 900 °C with similar trend noticed during TGA regarding their thermal decomposition. However, the most relevant observation is related to a sharp enhancement of the reducibility of AlSr-y with the appearance two reduction ranges highlighting the existence of different types of interactions with strontium and the alumina substrate.

Keywords

Alkaline earth Alumina Morphology Reducibility 

Notes

Acknowledgements

We would like to thank Olivier Gardoll who conducted H2-TPR experiments, Nora Djelal for TGA/DSC analysis, and Laurence Burylo for XRD measurements, from Catalysis and Chemistry of Solids Unit (UCCS), Lille University of Sciences and Technologies, 59655, Villeneuve d’Ascq, France.

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Madani Ghelamallah
    • 1
    Email author
  • Soufi Kacimi
    • 2
  • Pascal Granger
    • 3
  1. 1.Laboratoire de Matériaux, Applications et EnvironnementUniversité Mustapha StambouliMascaraAlgeria
  2. 2.Laboratoire de Chimie Appliquée, Institut des Sciences et de la TechnologieCentre Universitaire d’Ain TemouchentAin TemouchentAlgeria
  3. 3.UMR 8181—UCCS—Unité de Catalyse et Chimie du SolideUniversity of Lille, CNRS, Centrale Lille, ENSCL, University of ArtoisLilleFrance

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