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Biogenic iron compounds: XRD, Mossbauer and FTIR study

100%
Shopska M., Cherkezova-Zheleva Z., Paneva D., Iliev M., Kadinov G., Mitov I., Groudeva V.
Open Chemistry
|
2013
|
vol. 11
|
issue 2
215-227
EN
Materials based on biogenic iron oxides, which are a product of the metabolic activities of the neutrophilic iron-oxidizing bacteria (NIOB) from Sphaerotilus-Leptothrix group, were investigated. Natural microbial probes were collected from freshwater flow from Vitosha Mountain (Bulgaria) and cultivated under laboratory conditions in respect to select suitable cultures and conditions (nutrition media) for biomaterial accumulation of biogenic oxides. Samples were studied by physicochemical methods: X-ray diffraction, Mossbauer spectroscopy and IR spectroscopy. Their phase composition and physicochemical properties were obtained. Presence of both amorphous and crystal phase (ultra- and highly dispersed particles) was proved. Iron-containing compound in the natural biomass consists of α-FeOOH. The cultivated materials have more complex composition with iron-containing ingredients as α-FeOOH, Γ-FeOOH, Γ-Fe2O3 and Fe3O4. The sample of natural biomass was tested in reaction of CO oxidation and it showed potential to be used as catalyst support. [...]
2
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Copper-cobalt ferrites as catalysts for methanol decomposition

84%
Velinov N., Koleva K., Tsoncheva T., Paneva D., Manova E., Tenchev K., Kunev B., Genova I., Mitov I.
Open Chemistry
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2014
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vol. 12
|
issue 2
250-259
EN
Copper-cobalt ferrites with composition Cu1−xCoxFe2O4, where x= 0.2 and 0.8 were prepared by thermal treatment of co-precipitated precursor. The obtained materials were characterized by TG-DSC, XRD, Transmission and Conversion Electron Mössbauer spectroscopy and temperature programmed reduction with hydrogen. The catalytic properties of ferrites were tested in methanol decomposition to CO and hydrogen.
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