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Catalytic Combustion of Methane on Substituted Strontium Ferrites Full article

Journal Fuel
ISSN: 0016-2361 , E-ISSN: 1873-7153
Output data Year: 2011, Volume: 90, Number: 3, Pages: 1245-1256 Pages count : 12 DOI: 10.1016/j.fuel.2010.11.012
Tags H2-TPR, Hexaferrite, Methane oxidation, XPS, XRD
Authors Bukhtiyarova Marina V. 1 , Ivanova Aleksandra S. 1 , Slavinskaya Elena M. 1 , Plyasova Lyudmila M. 1 , Rogov Vladimir A. 1 , Kaichev Vasily V. 1 , Noskov Aleksander S. 1
Affiliations
1 Boreskov Institute of Catalysis SB RAS, Pr. Akad. Lavrentieva, 5, 630090 Novosibirsk, Russia

Abstract: Sr–hexaferrites prepared by co-precipitation method and calcined at 700–1000 °С have been characterized by thermogravimetric and differential thermal analysis (TG–DTA), Fourier transformed infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H2-TPR), and Ar adsorption techniques. It has been shown that hexaferrite phase formed after calcination at 700 °С is amorphous and its crystallization occurs at 800 °С. Specific surface area (SBET) of the samples calcined at 700 °С is 30–60 m2/g. Reduction in hydrogen proceeds in several steps, Fe(III) in the hexaferrite structure being practically reduced to Fe0. Amount of hydrogen necessary for the reduction of the samples decrease in the order: SrMn2Fe10O19 > SrFe12O19 > SrMn6Fe6O19 > SrMn2Al10O19. Surface composition of the ferrites differs from bulk. According to XPS data, the surface is enriched with strontium. Sr segregation is most probably explained by the formation of surface carbonates and hydroxocarbonates. The main components on the surface are in oxidized states: Mn3+ and Fe3+. Maximum activity in the methane oxidation is achieved for the SrMnxFe12−xO19 (0 ⩽ x ⩽ 2) catalysts. These samples are characterized by highest amount of the hexaferrite phase, which promotes change of oxidation state Mn(Fe)3+ ↔ Mn(Fe)2+.
Cite: Bukhtiyarova M.V. , Ivanova A.S. , Slavinskaya E.M. , Plyasova L.M. , Rogov V.A. , Kaichev V.V. , Noskov A.S.
Catalytic Combustion of Methane on Substituted Strontium Ferrites
Fuel. 2011. V.90. N3. P.1245-1256. DOI: 10.1016/j.fuel.2010.11.012 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
Submitted: May 18, 2010
Accepted: Nov 3, 2010
Published online: Nov 20, 2010
Published print: Mar 1, 2011
Identifiers:
Web of science: WOS:000287476000041
Scopus: 2-s2.0-79951941570
Elibrary: 16686507
Chemical Abstracts: 2011:212846
Chemical Abstracts (print): 155:216443
OpenAlex: W2028701907
Citing:
DB Citing
Web of science 31
Scopus 35
Elibrary 32
OpenAlex 35
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