The effect of composition and gel treatment conditions on the textural properties, reducibility, and catalytic activity of sol-gel-prepared Fe(III)-Cr(III) bulk mixed oxides

Abbas Khaleel, Muhammad Nawaz

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Highly porous aerogels and xerogels of Cr(III)-Fe(III) bulk mixed oxides with high surface areas were prepared from their nitrate precursors using propylene oxide as a gelation promoter. Products obtained upon treating the gels under supercritical conditions of the employed solvent were compared with their counterparts obtained from gels treated with supercritical CO2 to remove the solvent. Solvent supercritical conditions resulted in amorphous or weakly crystalline nanopowders, after calcination at 500°C, with significantly higher surface areas and larger pore volumes. Furthermore, the mixed oxides showed enhanced reducibility than their parent single metal oxides which was reflected in an enhanced catalytic activity in the oxidation of benzene. Besides their dependence on the preparative conditions, physicochemical properties and catalytic activity of the composites were significantly dependent on the Fe/Cr ratio.

Original languageEnglish
Pages (from-to)52-57
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume488
DOIs
Publication statusPublished - Jan 5 2016

Keywords

  • Mesoporous materials
  • Metal oxides
  • Nanostructured materials
  • Oxidation
  • Sol-gel processes

ASJC Scopus subject areas

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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