Mössbauer study of the Ni/Ca0.8Sr0.2T-1-xFex O3-α catalyst system for partial oxidation of methane to synthesis gas

Z. Homonnay, K. Nomura, S. Hamakawa, T. Hayakawa, G. Juhász, E. Kuzmann, A. Vértes

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Ni/Ca0.8Sr0.2TiO3 catalyst system prepared by the citrate method shows high activity in partial oxidation of methane to synthesis gas. It is assumed that the interaction of Ni with the perovskite lattice may be responsible for the increased catalytic activity. 1% 57Fe dopant substituted for Ti was used in order to see if the presence of Ni has any perturbation effect on the structure of the perovskite. One may expect systematic changes in the Mössbauer parameters of the substitutional Fe impurity as a function of the NiO content if the bulk properties of the perovskite are affected. Samples with different Ni/Ca0.8Sr0.2Ti0.9957 Fe0.01O3-α ratios from 0:1 to 1:1, and others having Fe substitutions for Ti up to 30%, all prepared by the citrate method, have been investigated. The Mössbauer spectra contained doublets of paramagnetic Fe3+ and Fe4+ species as well as paramagnetically relaxed Fe3+. These species were assigned to the bulk perovskite, the perovskite, surface and the NiO/perovskite interface. The perturbation of the perovskite structure by Ni could not be verified.

Original languageEnglish
Pages (from-to)41-50
Number of pages10
JournalHyperfine Interactions
Volume139-140
Issue number1-4
DOIs
Publication statusPublished - 2002

Fingerprint

synthesis gas
Synthesis gas
Methane
citrates
Perovskite
methane
catalysts
perturbation
Oxidation
oxidation
Catalysts
catalytic activity
substitutes
impurities
Citric Acid
interactions
perovskite
Catalyst activity
Substitution reactions
Thermodynamic properties

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Nuclear and High Energy Physics

Cite this

Mössbauer study of the Ni/Ca0.8Sr0.2T-1-xFex O3-α catalyst system for partial oxidation of methane to synthesis gas. / Homonnay, Z.; Nomura, K.; Hamakawa, S.; Hayakawa, T.; Juhász, G.; Kuzmann, E.; Vértes, A.

In: Hyperfine Interactions, Vol. 139-140, No. 1-4, 2002, p. 41-50.

Research output: Contribution to journalArticle

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AU - Vértes, A.

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