Study on reduction behavior of two-component Fe–Mg–O oxide system prepared via a sol-gel technique

Timofey M. Karnaukhov, Aleksey A. Vedyagin, Svetlana V. Cherepanova, Vladimir A. Rogov, Vladimir O. Stoyanovskii, Ilya V. Mishakov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Two-component Fe–Mg–O oxide system was prepared via sol-gel technique. An aqueous solution of iron nitrate was used to hydrolyze the magnesium methoxide instead of distilled water. The iron loading in a final sample was 15 wt% with respect to Fe2O3. The method was shown to provide a uniform distribution of iron oxide within MgO matrix. The sample was characterized by means of a low-temperature nitrogen adsorption and scanning electron microscopy. Reduction behavior of the sample was studied in a temperature-programmed regime using hydrogen as a reducing agent. In order to follow the possible phase transformations, the sample was examined by an in situ X-ray diffraction analysis in both reductive and oxidative atmospheres within the temperature range of 25–700 °C. It was found that after the first cycle of reduction/re-oxidation, the sample stabilizes in a novel state, and hydrogen uptake profiles of further cycles of reductive/oxidative treatment become completely reproducible. According to X-ray diffraction data, the sample consists of small particles (9 nm) of Fe3O4 phase well-dispersed within the structure of nanocrystalline MgO.

Original languageEnglish
Pages (from-to)30543-30549
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number52
DOIs
Publication statusPublished - 28 Dec 2017

Fingerprint

Sol-gels
gels
Oxides
oxides
Iron
Hydrogen
Reducing agents
Iron oxides
Temperature
X ray diffraction analysis
Magnesium
Nitrates
Phase transitions
Nitrogen
Adsorption
iron
X ray diffraction
Oxidation
Scanning electron microscopy
cycles

Keywords

  • Characterization
  • Doping
  • Iron oxide
  • Nanostructured MgO
  • Reduction behavior

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Study on reduction behavior of two-component Fe–Mg–O oxide system prepared via a sol-gel technique. / Karnaukhov, Timofey M.; Vedyagin, Aleksey A.; Cherepanova, Svetlana V.; Rogov, Vladimir A.; Stoyanovskii, Vladimir O.; Mishakov, Ilya V.

In: International Journal of Hydrogen Energy, Vol. 42, No. 52, 28.12.2017, p. 30543-30549.

Research output: Contribution to journalArticle

Karnaukhov, Timofey M. ; Vedyagin, Aleksey A. ; Cherepanova, Svetlana V. ; Rogov, Vladimir A. ; Stoyanovskii, Vladimir O. ; Mishakov, Ilya V. / Study on reduction behavior of two-component Fe–Mg–O oxide system prepared via a sol-gel technique. In: International Journal of Hydrogen Energy. 2017 ; Vol. 42, No. 52. pp. 30543-30549.
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