Characterization of iron oxide in Fe2O3 SiO2 catalyst

Takashi Ida, Hideyasu Tsuiki, Akifumi Ueno, Kazuyuki Tohji, Yasuo Udagawa, Kumiko Iwai, Hirotoshi Sano

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44 Citations (Scopus)


Silica-supported iron oxide catalyst was prepared by hydrolysis of a mixed solution of ethyl silicate and iron(III) nitrate dissolved in ethylene glycol. A gel obtained by the hydrolysis was dried and calcined at various temperatures. The iron oxide particles thus prepared were maghemite (γ-Fe2O3), deduced by EXAFS (extended X-ray absorption fine structure) measurements and the sample color. The maghemite particles were classified into two groups: one is small but detectable by transmission electron microscopy (TEM) and the other is too small to be detected by TEM. The former was well controlled to a consistent size, which depended on the calcination temperature, and exhibited ferrimagnetic properties. The latter showed superparamagnetic properties and was estimated to be smaller than 10 Å in particle size by magnetic and Mössbauer measurements at low temperature. For comparison, the catalyst was also prepared by a conventional impregnation method using silica powder and an aqueous solution of iron(III) nitrate. Iron oxide thus prepared was hematite (α-Fe2O3) and the particle sizes were broadly distributed.

Original languageEnglish
Pages (from-to)428-439
Number of pages12
JournalJournal of Catalysis
Issue number2
Publication statusPublished - 1987 Aug
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry


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