Showing papers by "Tanya Tsoncheva published in 2010"
TL;DR: In this article, the phase composition of the obtained materials was characterized by XRD, Mossbauer spectroscopy, DSC and TPR analysis, and their catalytic properties were tested in total oxidation of toluene and methanol decomposition to CO and hydrogen.
74 citations
TL;DR: In this article, two series of catalytically active SnO2 powders were prepared from tin(IV) tert-butoxide and tin (IV) chloride as tin precursors.
Abstract: Two series of catalytically active SnO2 powders were prepared from tin(IV) tert-butoxide and tin(IV) chloride as tin precursors A part of the synthesized samples were additionally subjected to specific treatments during the preparation—a treatment at constant humidity and temperature and/or a “step calcination” The obtained samples were characterized by powder X-ray diffraction, nitrogen physisorption, transmission electron microscopy and were studied in the total oxidation of ethyl acetate The use of these specific treatments leads to materials that differ substantially in their textural characteristics and catalytic properties The highest catalytic activity and selectivity are obtained for samples prepared from tin(IV) tert-butoxide after the “step calcination” treatment
36 citations
TL;DR: In this paper, mesoporous ceria and SBA-15 silica were modified with iron and chromium oxide nanoparticles and characterized by XRD, N2-physisorption, FTIR, UV-vis, Moessbauer spectroscopy and TPR-TG in hydrogen.
30 citations
01 Mar 2010
TL;DR: In this article, a layered Ruddlesden-Popper phase LaSr3Fe3O10 was obtained by the nitrate-citrate method and phase composition and structural properties of the obtained materials were investigated by Mossbauer spectroscopy, X-ray diffraction (XRD), Xray Photoelectron Spectroscopy (XPS), and temperature programmed reduction (TPR).
Abstract: La-Sr-Fe perovskite-type oxides were prepared by the nitrate-citrate method. The basic object of this study is layered Ruddlesden-Popper phase LaSr3Fe3O10. The phase composition and structural properties of the obtained materials are investigated by Mossbauer spectroscopy, X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS) and temperature programmed reduction (TPR). The preliminary catalytic tests show a high potential of these materials for volatile organic compounds (VOCs) elimination as they possess high conversion ability and selectivity to total oxidation of ethyl acetate. Catalytic performance of LaSr3Fe3O10 is depended on the stability of structure and Fe4+-oxidation state.
3 citations
TL;DR: In this paper, the 11C-radiolabeling technique was applied to characterize nickel and aluminum modified MCM-41 mesoporous materials, and the contribution of various catalytic active sites to methanol conversion was discussed.
Abstract: 11C-radiolabeling technique was applied to characterize nickel and aluminum modified MCM-41 mesoporous materials. On the basis of desorption and catalytic transformations of methanol molecule, which were studied under different exposure of the surface to 11C-labeled and un-labeled methanol, the contributions of various catalytic active sites to methanol conversion was discussed.
3 citations