Oxidation of CO over Ru containing perovskite type oxides
Само за регистроване кориснике
2006
Чланак у часопису (Објављена верзија)

Метаподаци
Приказ свих података о документуАпстракт
Perovskite type catalysts La0.7Sr0.3Cr1-xRuxO3 (0.025 lt = x lt = 0.100) were synthesized by annealing a mixture of metal oxides and carbonates gradually up to 1000 degrees C in air, and characterized by XRPD, XPS, TPD, SEM-EDS and the van der Pauw method. The CO oxidation activity was investigated in a differential recycle reactor. According to the XRPD results, all samples achieved a perovskite structure, with a small presence of SrCrO4 phase. The XPS results revealed that the surface composition of all samples differed considerably from the stoichiometric value with ail important segregation of strontium and mainly ruthenium with regard to chromium at the surface of the catalysts. The sharp decrease of resistivity with increasing surface concentration of ruthenium and the independence of the resistivity on temperature for the sample with x = 0.100 imply the possible presence of SrRuO3, La-Ru-O and highly dispersed RuO2 (invisible by XRPD), known as good electric conductors, at the... surface. The CO oxidation activity increases with increasing the degree of substitution (x). The surface concentrations of ruthenium are almost the same in the samples with x = 0.075 and 0.100. Those samples showed the similar values of resistivity in whole investigated temperature ram,e and very close CO oxidation activity. which indicates that the concentration of Ru4+ in the surface region and its stability are determining factors for the CO oxidation activity. The main results of this study are that ruthenium perovskites have a high thermal stability and CO oxidation activity.
Кључне речи:
ruthenium / perovskite / electric resistivity / CO oxidation activityИзвор:
Applied Catalysis B-Environmental, 2006, 66, 3-4, 249-257Издавач:
- Elsevier Science Bv, Amsterdam
Финансирање / пројекти:
DOI: 10.1016/j.apcatb.2006.04.003
ISSN: 0926-3373
WoS: 000238331300012
Scopus: 2-s2.0-33646806480
Институција/група
Poljoprivredni fakultetTY - JOUR AU - Petrović, S. AU - Rakić, Vesna AU - Jovanović, D.M. AU - Baricević, A.T. PY - 2006 UR - http://aspace.agrif.bg.ac.rs/handle/123456789/1343 AB - Perovskite type catalysts La0.7Sr0.3Cr1-xRuxO3 (0.025 lt = x lt = 0.100) were synthesized by annealing a mixture of metal oxides and carbonates gradually up to 1000 degrees C in air, and characterized by XRPD, XPS, TPD, SEM-EDS and the van der Pauw method. The CO oxidation activity was investigated in a differential recycle reactor. According to the XRPD results, all samples achieved a perovskite structure, with a small presence of SrCrO4 phase. The XPS results revealed that the surface composition of all samples differed considerably from the stoichiometric value with ail important segregation of strontium and mainly ruthenium with regard to chromium at the surface of the catalysts. The sharp decrease of resistivity with increasing surface concentration of ruthenium and the independence of the resistivity on temperature for the sample with x = 0.100 imply the possible presence of SrRuO3, La-Ru-O and highly dispersed RuO2 (invisible by XRPD), known as good electric conductors, at the surface. The CO oxidation activity increases with increasing the degree of substitution (x). The surface concentrations of ruthenium are almost the same in the samples with x = 0.075 and 0.100. Those samples showed the similar values of resistivity in whole investigated temperature ram,e and very close CO oxidation activity. which indicates that the concentration of Ru4+ in the surface region and its stability are determining factors for the CO oxidation activity. The main results of this study are that ruthenium perovskites have a high thermal stability and CO oxidation activity. PB - Elsevier Science Bv, Amsterdam T2 - Applied Catalysis B-Environmental T1 - Oxidation of CO over Ru containing perovskite type oxides EP - 257 IS - 3-4 SP - 249 VL - 66 DO - 10.1016/j.apcatb.2006.04.003 ER -
@article{ author = "Petrović, S. and Rakić, Vesna and Jovanović, D.M. and Baricević, A.T.", year = "2006", abstract = "Perovskite type catalysts La0.7Sr0.3Cr1-xRuxO3 (0.025 lt = x lt = 0.100) were synthesized by annealing a mixture of metal oxides and carbonates gradually up to 1000 degrees C in air, and characterized by XRPD, XPS, TPD, SEM-EDS and the van der Pauw method. The CO oxidation activity was investigated in a differential recycle reactor. According to the XRPD results, all samples achieved a perovskite structure, with a small presence of SrCrO4 phase. The XPS results revealed that the surface composition of all samples differed considerably from the stoichiometric value with ail important segregation of strontium and mainly ruthenium with regard to chromium at the surface of the catalysts. The sharp decrease of resistivity with increasing surface concentration of ruthenium and the independence of the resistivity on temperature for the sample with x = 0.100 imply the possible presence of SrRuO3, La-Ru-O and highly dispersed RuO2 (invisible by XRPD), known as good electric conductors, at the surface. The CO oxidation activity increases with increasing the degree of substitution (x). The surface concentrations of ruthenium are almost the same in the samples with x = 0.075 and 0.100. Those samples showed the similar values of resistivity in whole investigated temperature ram,e and very close CO oxidation activity. which indicates that the concentration of Ru4+ in the surface region and its stability are determining factors for the CO oxidation activity. The main results of this study are that ruthenium perovskites have a high thermal stability and CO oxidation activity.", publisher = "Elsevier Science Bv, Amsterdam", journal = "Applied Catalysis B-Environmental", title = "Oxidation of CO over Ru containing perovskite type oxides", pages = "257-249", number = "3-4", volume = "66", doi = "10.1016/j.apcatb.2006.04.003" }
Petrović, S., Rakić, V., Jovanović, D.M.,& Baricević, A.T.. (2006). Oxidation of CO over Ru containing perovskite type oxides. in Applied Catalysis B-Environmental Elsevier Science Bv, Amsterdam., 66(3-4), 249-257. https://doi.org/10.1016/j.apcatb.2006.04.003
Petrović S, Rakić V, Jovanović D, Baricević A. Oxidation of CO over Ru containing perovskite type oxides. in Applied Catalysis B-Environmental. 2006;66(3-4):249-257. doi:10.1016/j.apcatb.2006.04.003 .
Petrović, S., Rakić, Vesna, Jovanović, D.M., Baricević, A.T., "Oxidation of CO over Ru containing perovskite type oxides" in Applied Catalysis B-Environmental, 66, no. 3-4 (2006):249-257, https://doi.org/10.1016/j.apcatb.2006.04.003 . .