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Methane Oxidation over Perovskite-Related Ferrites: Effects of Oxygen Nonstoichiometry Full article

Общее Language: Английский, Genre: Full article,
Status: Published, Source type: Original
Journal Solid State Sciences
ISSN: 1293-2558 , E-ISSN: 1873-3085
Output data Year: 2005, Volume: 7, Number: 11, Pages: 1344-1352 Pages count : 9 DOI: 10.1016/j.solidstatesciences.2005.08.004
Tags Catalytic activity, Ferrite, Methane oxidation, Mixed conductor, Mössbauer spectroscopy, Oxygen nonstoichiometry, Perovskite
Authors Kharton V.V. 1,2 , Patrakeev M.V. 1,3 , Waerenborgh J.C. 4 , Sobyanin V.A. 5 , Veniaminov S.A. 5 , Yaremchenko A.A. 1 , Gaczyński P. 4 , Belyaev V.D. 5 , Semin G.L. 5 , Frade J.R. 1
Affiliations
1 Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
2 Institute of Physicochemical Problems, Belarus State University, 14 Leningradskaya Str., 220050 Minsk, Belarus
3 Institute of Solid State Chemistry, UD RAS, 91 Pervomaiskaya Str., Ekaterinburg 620219, Russia
4 Chemistry Department, ITN/CFMC-UL, Estrada Nacional 10, P-2686-953 Sacavém, Portugal
5 Boreskov Institute of Catalysis, SB RAS, 5 pr. Akademika Lavrentieva, Novosibirsk 630090, Russia

Funding (5)

1 North Atlantic Treaty Organization 978002
2 Президиум СО РАН 42
3 Foundation for Science and Technology POCI/CTM/58570/2004
4 Foundation for Science and Technology SFRH/BPD/11606/2002
5 Foundation for Science and Technology SFRH/BPD/17649/2004

Abstract: The oxidation of CH4 pulses supplied in helium flow over perovskite-related La0.3Sr0.7Fe0.8M0.2O3−δ (M=Ga, Al) and SrFe0.7Al0.3O3−δ leads to significant yields of CO and H2 after achieving a critical level of oxygen deficiency in the ferrite-based mixed conductors. This effect, reproducible under steady-state conditions in the membrane reactors for methane conversion, may be of interest for the development of monolithic ceramic reactors where the dense membrane and porous catalyst at the permeate-side surface are made of similar compositions. The Mössbauer spectroscopy and coulometric titration studies show that the presence of metallic Fe under typical operation conditions can be neglected, whilst most oxygen vacancies in the ferrite lattices are ordered. Increasing selectivity towards the partial oxidation of methane is observed in the vicinity of the state where the iron cations are predominantly trivalent and massive ordering processes in the oxygen sublattice start. The catalytic activity of ferrite-based materials may hence result from the lattice instability characteristic of morphotropic phase transformations. The correlations between catalytic behavior and oxygen ionic transport are briefly discussed.
Cite: Kharton V.V. , Patrakeev M.V. , Waerenborgh J.C. , Sobyanin V.A. , Veniaminov S.A. , Yaremchenko A.A. , Gaczyński P. , Belyaev V.D. , Semin G.L. , Frade J.R.
Methane Oxidation over Perovskite-Related Ferrites: Effects of Oxygen Nonstoichiometry
Solid State Sciences. 2005. V.7. N11. P.1344-1352. DOI: 10.1016/j.solidstatesciences.2005.08.004 publication_identifier_short.wos_identifier_type publication_identifier_short.scopus_identifier_type publication_identifier_short.rinz_identifier_type
Dates:
Submitted: Apr 30, 2004
Accepted: Aug 28, 2005
Published online: Oct 14, 2005
Published print: Nov 1, 2005
Identifiers:
publication_identifier.wos_identifier_type WOS:000233620600007
publication_identifier.scopus_identifier_type 2-s2.0-27744573299
publication_identifier.rinz_identifier_type 13478655
publication_identifier.accession_number_identifier_type 2005:1203193
publication_identifier.chemical_accession_number_identifier_type 144:276734
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