TY  - JOUR
AU  - Petrović, Srđan
AU  - Terlecki Baričević, Ana
AU  - Karanović, Ljiljana
AU  - Kirilov-Stefanov, Plamen
AU  - Zdujić, Miodrag
AU  - Dondur, Vera
AU  - Paneva, D.
AU  - Mitov, I.
AU  - Rakić, V.
PY  - 2008
UR  - https://dais.sanu.ac.rs/123456789/3586
AB  - Two new series of perovskite-type oxides LaMO3 (M = Mg, Ti, Fe) with different ratio Mg/Fe (MF) and Ti/Fe (TF) in the B cation site were prepared by annealing the precursor, obtained by the mechanochemical activation (MCA) of constituent metal oxides, at 1000 °C in air. In addition, two closely related perovskites LaFeO3 (LF) and LaTi0.5Mg0.5O3 (TM (50:50)) were synthesized in the similar way. Using MCA method, perovskites were obtained in rather short time and at room temperature. The samples were characterized by X-ray powder diffraction (XRPD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), temperature programmed desorption of oxygen (TPD), Mössbauer spectroscopy, BET surface area measurements and tested in methane deep oxidation. According to XRPD analysis all synthesized samples are almost single perovskite phase, with trace amounts of La2O3 phase. Data of Mössbauer spectroscopy identify Fe3+ in octahedral coordination. The activity of perovskite in methane deep oxidation increases in the order TM (50:50) < MF series < TF series. Higher activity of TF samples in respect to MF with similar Fe content can be related to the structural characteristic, mainly to the presence of predominantly most labile oxygen species evidenced by TPD at lowest temperature of oxygen evaluation. In used experimental conditions, the Fe substituted perovskite are thermal stable up to the temperature of 850 °C. The stability of Fe active sites is probably the most important parameter responsible for thermal stability of perovskite, but the atomic surface composition also should be taken into account. © 2007 Elsevier B.V. All rights reserved.
PB  - Elsevier
T2  - Applied Catalysis B: Environmental
T1  - LaMO3 (M = Mg, Ti, Fe) perovskite type oxides: Preparation, characterization and catalytic properties in methane deep oxidation
SP  - 186
EP  - 198
VL  - 79
IS  - 2
DO  - 10.1016/j.apcatb.2007.10.022
UR  - https://hdl.handle.net/21.15107/rcub_dais_3586
ER  - 

@article{
author = "Petrović, Srđan and Terlecki Baričević, Ana and Karanović, Ljiljana and Kirilov-Stefanov, Plamen and Zdujić, Miodrag and Dondur, Vera and Paneva, D. and Mitov, I. and Rakić, V.",
year = "2008",
abstract = "Two new series of perovskite-type oxides LaMO3 (M = Mg, Ti, Fe) with different ratio Mg/Fe (MF) and Ti/Fe (TF) in the B cation site were prepared by annealing the precursor, obtained by the mechanochemical activation (MCA) of constituent metal oxides, at 1000 °C in air. In addition, two closely related perovskites LaFeO3 (LF) and LaTi0.5Mg0.5O3 (TM (50:50)) were synthesized in the similar way. Using MCA method, perovskites were obtained in rather short time and at room temperature. The samples were characterized by X-ray powder diffraction (XRPD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS), temperature programmed desorption of oxygen (TPD), Mössbauer spectroscopy, BET surface area measurements and tested in methane deep oxidation. According to XRPD analysis all synthesized samples are almost single perovskite phase, with trace amounts of La2O3 phase. Data of Mössbauer spectroscopy identify Fe3+ in octahedral coordination. The activity of perovskite in methane deep oxidation increases in the order TM (50:50) < MF series < TF series. Higher activity of TF samples in respect to MF with similar Fe content can be related to the structural characteristic, mainly to the presence of predominantly most labile oxygen species evidenced by TPD at lowest temperature of oxygen evaluation. In used experimental conditions, the Fe substituted perovskite are thermal stable up to the temperature of 850 °C. The stability of Fe active sites is probably the most important parameter responsible for thermal stability of perovskite, but the atomic surface composition also should be taken into account. © 2007 Elsevier B.V. All rights reserved.",
publisher = "Elsevier",
journal = "Applied Catalysis B: Environmental",
title = "LaMO3 (M = Mg, Ti, Fe) perovskite type oxides: Preparation, characterization and catalytic properties in methane deep oxidation",
pages = "186-198",
volume = "79",
number = "2",
doi = "10.1016/j.apcatb.2007.10.022",
url = "https://hdl.handle.net/21.15107/rcub_dais_3586"
}

Petrović, S., Terlecki Baričević, A., Karanović, L., Kirilov-Stefanov, P., Zdujić, M., Dondur, V., Paneva, D., Mitov, I.,& Rakić, V.. (2008). LaMO3 (M = Mg, Ti, Fe) perovskite type oxides: Preparation, characterization and catalytic properties in methane deep oxidation. in Applied Catalysis B: Environmental
Elsevier., 79(2), 186-198.
https://doi.org/10.1016/j.apcatb.2007.10.022
https://hdl.handle.net/21.15107/rcub_dais_3586

Petrović S, Terlecki Baričević A, Karanović L, Kirilov-Stefanov P, Zdujić M, Dondur V, Paneva D, Mitov I, Rakić V. LaMO3 (M = Mg, Ti, Fe) perovskite type oxides: Preparation, characterization and catalytic properties in methane deep oxidation. in Applied Catalysis B: Environmental. 2008;79(2):186-198.
doi:10.1016/j.apcatb.2007.10.022
https://hdl.handle.net/21.15107/rcub_dais_3586 .

Petrović, Srđan, Terlecki Baričević, Ana, Karanović, Ljiljana, Kirilov-Stefanov, Plamen, Zdujić, Miodrag, Dondur, Vera, Paneva, D., Mitov, I., Rakić, V., "LaMO3 (M = Mg, Ti, Fe) perovskite type oxides: Preparation, characterization and catalytic properties in methane deep oxidation" in Applied Catalysis B: Environmental, 79, no. 2 (2008):186-198,
https://doi.org/10.1016/j.apcatb.2007.10.022 .,
https://hdl.handle.net/21.15107/rcub_dais_3586 .

TY  - JOUR
AU  - Dimitrijević, Radovan
AU  - Dondur, Vera
AU  - Vulić, Predrag
AU  - Marković, Smilja
AU  - Macura, Slobodan
PY  - 2004
UR  - https://dais.sanu.ac.rs/123456789/16226
AB  - Using the zeolite thermally induced transformation route and starting from Na-LTA, Na-FAU and Na-GIS zeolites as precursors, we synthesized pure sodium nephelines (ps-Ne) with Si/Al ratios between 1.0 and 1.5 (ps-NeLTA, ps-NeFAU, ps-NeGIS). By X-ray diffraction analysis of intermediaries, we found that ps-NeLTA and ps-NeFAU were obtained as polymorphous transformation products from carnegieite phases and ps-NeGIS was synthesized directly from amorphous zeolite precursor. Stoichiometric ps-NeLTA {Na8[Al8Si8]16O32} and nonstoichiometric ps-NeFAU {(Na7.20A0.80)8[Al7.20Si8.80]16O32} and ps-NeGIS {(Na6.41A1.59)8[Al6.41Si9.59]16O32} were obtained at temperatures 900– 1200 8C. The crystal structures of these ps-Ne-s were refined in the P63 space group, from X-ray powder data using the Rietveld method. Mean T – O bond lengths decreases almost linearly with increasing the Si/Al ratio. These changes are induced by short-range order–disorder of Si, Al cations through the TG and TS sites. The increase of short-range disorder over T-sites, is followed and confirmed by 29Si MAS NMR and IR spectroscopy. Comparison of the Si/Al ordering of synthesized ps-Ne structures with the published data shows inverse segregation of framework cations (Si; T1 ¼ T4 and Al; T2 ¼ T3). That is probably a consequence of applied synthesis route.
T2  - Journal of Physics and Chemistry of Solids
T1  - Structural characterization of pure Na-nephelines synthesized by zeolite conversion route
SP  - 1623
EP  - 1633
VL  - 65
IS  - 10
DO  - 10.1016/j.jpcs.2004.03.005
UR  - https://hdl.handle.net/21.15107/rcub_dais_16226
ER  - 

@article{
author = "Dimitrijević, Radovan and Dondur, Vera and Vulić, Predrag and Marković, Smilja and Macura, Slobodan",
year = "2004",
abstract = "Using the zeolite thermally induced transformation route and starting from Na-LTA, Na-FAU and Na-GIS zeolites as precursors, we synthesized pure sodium nephelines (ps-Ne) with Si/Al ratios between 1.0 and 1.5 (ps-NeLTA, ps-NeFAU, ps-NeGIS). By X-ray diffraction analysis of intermediaries, we found that ps-NeLTA and ps-NeFAU were obtained as polymorphous transformation products from carnegieite phases and ps-NeGIS was synthesized directly from amorphous zeolite precursor. Stoichiometric ps-NeLTA {Na8[Al8Si8]16O32} and nonstoichiometric ps-NeFAU {(Na7.20A0.80)8[Al7.20Si8.80]16O32} and ps-NeGIS {(Na6.41A1.59)8[Al6.41Si9.59]16O32} were obtained at temperatures 900– 1200 8C. The crystal structures of these ps-Ne-s were refined in the P63 space group, from X-ray powder data using the Rietveld method. Mean T – O bond lengths decreases almost linearly with increasing the Si/Al ratio. These changes are induced by short-range order–disorder of Si, Al cations through the TG and TS sites. The increase of short-range disorder over T-sites, is followed and confirmed by 29Si MAS NMR and IR spectroscopy. Comparison of the Si/Al ordering of synthesized ps-Ne structures with the published data shows inverse segregation of framework cations (Si; T1 ¼ T4 and Al; T2 ¼ T3). That is probably a consequence of applied synthesis route.",
journal = "Journal of Physics and Chemistry of Solids",
title = "Structural characterization of pure Na-nephelines synthesized by zeolite conversion route",
pages = "1623-1633",
volume = "65",
number = "10",
doi = "10.1016/j.jpcs.2004.03.005",
url = "https://hdl.handle.net/21.15107/rcub_dais_16226"
}

Dimitrijević, R., Dondur, V., Vulić, P., Marković, S.,& Macura, S.. (2004). Structural characterization of pure Na-nephelines synthesized by zeolite conversion route. in Journal of Physics and Chemistry of Solids, 65(10), 1623-1633.
https://doi.org/10.1016/j.jpcs.2004.03.005
https://hdl.handle.net/21.15107/rcub_dais_16226

Dimitrijević R, Dondur V, Vulić P, Marković S, Macura S. Structural characterization of pure Na-nephelines synthesized by zeolite conversion route. in Journal of Physics and Chemistry of Solids. 2004;65(10):1623-1633.
doi:10.1016/j.jpcs.2004.03.005
https://hdl.handle.net/21.15107/rcub_dais_16226 .

Dimitrijević, Radovan, Dondur, Vera, Vulić, Predrag, Marković, Smilja, Macura, Slobodan, "Structural characterization of pure Na-nephelines synthesized by zeolite conversion route" in Journal of Physics and Chemistry of Solids, 65, no. 10 (2004):1623-1633,
https://doi.org/10.1016/j.jpcs.2004.03.005 .,
https://hdl.handle.net/21.15107/rcub_dais_16226 .