Sol-gel derived Cr(III) and Cu(II)/γ-Al2O3 doped solids: Effect of the dopant precursor nature on the structural, textural and morphological properties

Abbas Khaleel, Muhammad Nawaz, Bassam Hindawi

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Powders of xerogel γ-Al2O3 doped with various concentrations of Cr3+ and Cu2+ (M/M + Al molar fraction = 0.75-10%) were prepared via a sol-gel method. Cr3+ and Cu 2+ precursors (acetylacetonate, nitrate or chloride) were added to 0.12 M 2-propanol solution of aluminum tri-sec-butoxide (ASB) and hydrolysis was performed using a H2O/ASB molar ratio of 4.7. The effect of the dopant precursor on structural, textural and morphological properties was studied. Employing acac precursors resulted in unique properties after calcination at 500 °C including high surface areas, as high as 455 m 2/g, homogeneous mesopores, 3-12 nm, and amorphous powders (5-10 nm particles in diameter). On the other hand, the acac precursor enhanced the resistance to sintering mainly at higher metal loads (10%) and elevated temperature (800 °C). Nevertheless, the solids issued from nitrate and chloride precursors exhibited lower surface areas at high metal loads, and lower resistance to sintering.

Original languageEnglish
Pages (from-to)1709-1715
Number of pages7
JournalMaterials Research Bulletin
Volume48
Issue number4
DOIs
Publication statusPublished - Apr 2013

Keywords

  • A. Nanostructures
  • A. Oxides
  • B. Sol-gel chemistry
  • C. X-ray diffraction
  • D. Microstructure

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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