TY  - JOUR
AU  - Grbić, Boško
AU  - Radić, Nenad
AU  - Markovic, B
AU  - Stefanov, P
AU  - Stoychev, D
AU  - Marinova, T
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/234
AB  - The influence of low loadings of MnOx on the catalytic activity for n-hexene and CO oxidation over highly dispersed Pt on alumina catalysts has been investigated. The applied deposition-precipitation method allows Mn to be deposited on the Pt containing egg-shell volume. The catalyst samples were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and selective CO chemisorption. Platinum influences the dispersion of deposited MnOx. The dispersion of the MnOx phase is higher on Pt containing samples than on Al2O3. The Pt decoration by Mn is reflected by a low CO uptake and the Pt oxidation state (Pt2+). The addition of Mn lowers the catalytic activity for CO oxidation. This is attributed to a change of the Pt sites such that adsorption of CO is less favorable. The activity of the catalysts in the oxidation of n-hexane showed a significant improvement with addition of MnOx. A light-off shift by about 40 degrees C was observed. This improvement is attributed to the formation of Mn-Pt oxide like species that primarily weakens the Pt-O bond.
PB  - Elsevier
T2  - Applied Catalysis B-Environmental
T1  - Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation
VL  - 64
IS  - 1-2
SP  - 51
EP  - 56
DO  - 10.1016/j.apcatb.2005.11.001
ER  - 

@article{
author = "Grbić, Boško and Radić, Nenad and Markovic, B and Stefanov, P and Stoychev, D and Marinova, T",
year = "2006",
abstract = "The influence of low loadings of MnOx on the catalytic activity for n-hexene and CO oxidation over highly dispersed Pt on alumina catalysts has been investigated. The applied deposition-precipitation method allows Mn to be deposited on the Pt containing egg-shell volume. The catalyst samples were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and selective CO chemisorption. Platinum influences the dispersion of deposited MnOx. The dispersion of the MnOx phase is higher on Pt containing samples than on Al2O3. The Pt decoration by Mn is reflected by a low CO uptake and the Pt oxidation state (Pt2+). The addition of Mn lowers the catalytic activity for CO oxidation. This is attributed to a change of the Pt sites such that adsorption of CO is less favorable. The activity of the catalysts in the oxidation of n-hexane showed a significant improvement with addition of MnOx. A light-off shift by about 40 degrees C was observed. This improvement is attributed to the formation of Mn-Pt oxide like species that primarily weakens the Pt-O bond.",
publisher = "Elsevier",
journal = "Applied Catalysis B-Environmental",
title = "Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation",
volume = "64",
number = "1-2",
pages = "51-56",
doi = "10.1016/j.apcatb.2005.11.001"
}

Grbić, B., Radić, N., Markovic, B., Stefanov, P., Stoychev, D.,& Marinova, T.. (2006). Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation. in Applied Catalysis B-Environmental
Elsevier., 64(1-2), 51-56.
https://doi.org/10.1016/j.apcatb.2005.11.001

Grbić B, Radić N, Markovic B, Stefanov P, Stoychev D, Marinova T. Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation. in Applied Catalysis B-Environmental. 2006;64(1-2):51-56.
doi:10.1016/j.apcatb.2005.11.001 .

Grbić, Boško, Radić, Nenad, Markovic, B, Stefanov, P, Stoychev, D, Marinova, T, "Influence of manganese oxide on the activity of Pt/Al2O3 catalyst for CO and n-hexane oxidation" in Applied Catalysis B-Environmental, 64, no. 1-2 (2006):51-56,
https://doi.org/10.1016/j.apcatb.2005.11.001 . .

TY  - JOUR
AU  - Terlecki-Baričević, Ana V.
AU  - Petrović, Srđan
AU  - Jovanović, Dušan M.
AU  - Karanović, Lj.
AU  - Marinova, C.
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4
AB  - The oxidation of CO over La1-ySryCr1-xRuxO3 perovskite type oxides with y=0.3 and 0 £x £0.100 have been studied. X-ray fluorescence analysis confirmed that content of elements in the bulk corresponds to the established nominal perovskite stoichiometry, indicating that no significant oxidation of ruthenium into volatile polyvalent oxides with their consequent escape from the sample occurred in air up to the temperature of 1000 ºC. According to X-ray diffraction analysis, all samples achieved the perovskite hexagonal with the presence of some SrCrO4. X-ray photoelectron spectroscopy analysis of ruthenium samples shows higher Ru and Sr surface concentrations than in the bulk. The binding energy for Ru3p is virtually the same in all samples and consistent with that of Ru4+ (463.6.464.3eV). Kinetic studies were performed in a differential recycle reactor with a recycling ratio 80. The results show that substitution of Ru4+ for Cr3+ in La1-ySryCrO3 leads to a significant increase in both the activity and the activation energy. The global CO oxidation rate, referred on the BET surface area, correlates with the surface Ru4+ atomic concentration. Hence, the activity reflect the surface enrichment in ruthenium. Moreover, an identical apparent activation energy E = 93 kJ/mol and the same specific rate per ruthenium surface ion were obtained for samples with a Ru content x ‡ 0.05 suggest that exposed Ru4+ ions mainly participate in the reaction.
AB  - Predmet ovog rada je ispitivanje katalitičke aktivnosti mešanih oksida La1-ySryCr1-xRuxO3 strukture perovskita sa y = 0,3 i 0,025 £ x £ 0,100 u oksidaciji ugljenmonoksida. Visoka saglasnost unete i X-fluoroscentnom analizom nađene količine rutenijuma u uzorcima kalcinisanim na 100ºC u vazduhu, ukazuje na to da nije došlo do značajne oksidacije Ru do isparljivih polivalentnih oksida i njihovog otparavanja iz uzorka. Analiza difraktograma X-zraka je pokazala da je u svim uzorcima pored perovskitne faze prisutan i manji udeo SrCrO4 faze. Koncentracije Sr i Ru u površinskim slojevima, izračunate iz X-fotoelektronske spektroskopije, su veće u odnosu na njihovu koncentraciju u masi. Energija veze Ru3p je ista za sve uzorke i karakteristična je za Ru4+. Kinetika oksidacije ugljenmonoksida ispitivana je u diferencijalnom recirkulacionom reaktoru. Rezultati pokazuju da delimična zamena Cr3+ sa Ru4+ u La1-ySryCrO3 dovodi do znatnog porasta aktivnosti i energije aktivacije. Ukupna brzina oksidacija CO, obračunata po jedinici specifične površine, je skoro proporcionalna porastu atomske koncentracije Ru4+ na površini uzorka, odnosno Rux ‡ 0,05 dobivena je ista prividna energija aktivacije od E = 93 kJ/mol i ista specifična brzina oksidacije po površinskom jonu Ru4+,što ukazuje na to da su joni Ru4+ izloženi i da oni prevashodno učestvuju u reakciji.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Characterization and carbon monoxide oxidation activity of La1-ySryCr1-xRuxO3 perovskites
T1  - Katalitička svojstva La1-ySryCr1-xRuxO3 perovskita u oksidaciji ugljenmonoksida
VL  - 65
IS  - 1
SP  - 15
EP  - 25
DO  - 10.2298/JSC0001015T
ER  - 

@article{
author = "Terlecki-Baričević, Ana V. and Petrović, Srđan and Jovanović, Dušan M. and Karanović, Lj. and Marinova, C.",
year = "2000",
abstract = "The oxidation of CO over La1-ySryCr1-xRuxO3 perovskite type oxides with y=0.3 and 0 £x £0.100 have been studied. X-ray fluorescence analysis confirmed that content of elements in the bulk corresponds to the established nominal perovskite stoichiometry, indicating that no significant oxidation of ruthenium into volatile polyvalent oxides with their consequent escape from the sample occurred in air up to the temperature of 1000 ºC. According to X-ray diffraction analysis, all samples achieved the perovskite hexagonal with the presence of some SrCrO4. X-ray photoelectron spectroscopy analysis of ruthenium samples shows higher Ru and Sr surface concentrations than in the bulk. The binding energy for Ru3p is virtually the same in all samples and consistent with that of Ru4+ (463.6.464.3eV). Kinetic studies were performed in a differential recycle reactor with a recycling ratio 80. The results show that substitution of Ru4+ for Cr3+ in La1-ySryCrO3 leads to a significant increase in both the activity and the activation energy. The global CO oxidation rate, referred on the BET surface area, correlates with the surface Ru4+ atomic concentration. Hence, the activity reflect the surface enrichment in ruthenium. Moreover, an identical apparent activation energy E = 93 kJ/mol and the same specific rate per ruthenium surface ion were obtained for samples with a Ru content x ‡ 0.05 suggest that exposed Ru4+ ions mainly participate in the reaction., Predmet ovog rada je ispitivanje katalitičke aktivnosti mešanih oksida La1-ySryCr1-xRuxO3 strukture perovskita sa y = 0,3 i 0,025 £ x £ 0,100 u oksidaciji ugljenmonoksida. Visoka saglasnost unete i X-fluoroscentnom analizom nađene količine rutenijuma u uzorcima kalcinisanim na 100ºC u vazduhu, ukazuje na to da nije došlo do značajne oksidacije Ru do isparljivih polivalentnih oksida i njihovog otparavanja iz uzorka. Analiza difraktograma X-zraka je pokazala da je u svim uzorcima pored perovskitne faze prisutan i manji udeo SrCrO4 faze. Koncentracije Sr i Ru u površinskim slojevima, izračunate iz X-fotoelektronske spektroskopije, su veće u odnosu na njihovu koncentraciju u masi. Energija veze Ru3p je ista za sve uzorke i karakteristična je za Ru4+. Kinetika oksidacije ugljenmonoksida ispitivana je u diferencijalnom recirkulacionom reaktoru. Rezultati pokazuju da delimična zamena Cr3+ sa Ru4+ u La1-ySryCrO3 dovodi do znatnog porasta aktivnosti i energije aktivacije. Ukupna brzina oksidacija CO, obračunata po jedinici specifične površine, je skoro proporcionalna porastu atomske koncentracije Ru4+ na površini uzorka, odnosno Rux ‡ 0,05 dobivena je ista prividna energija aktivacije od E = 93 kJ/mol i ista specifična brzina oksidacije po površinskom jonu Ru4+,što ukazuje na to da su joni Ru4+ izloženi i da oni prevashodno učestvuju u reakciji.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Characterization and carbon monoxide oxidation activity of La1-ySryCr1-xRuxO3 perovskites, Katalitička svojstva La1-ySryCr1-xRuxO3 perovskita u oksidaciji ugljenmonoksida",
volume = "65",
number = "1",
pages = "15-25",
doi = "10.2298/JSC0001015T"
}

Terlecki-Baričević, A. V., Petrović, S., Jovanović, D. M., Karanović, Lj.,& Marinova, C.. (2000). Characterization and carbon monoxide oxidation activity of La1-ySryCr1-xRuxO3 perovskites. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 65(1), 15-25.
https://doi.org/10.2298/JSC0001015T

Terlecki-Baričević AV, Petrović S, Jovanović DM, Karanović L, Marinova C. Characterization and carbon monoxide oxidation activity of La1-ySryCr1-xRuxO3 perovskites. in Journal of the Serbian Chemical Society. 2000;65(1):15-25.
doi:10.2298/JSC0001015T .

Terlecki-Baričević, Ana V., Petrović, Srđan, Jovanović, Dušan M., Karanović, Lj., Marinova, C., "Characterization and carbon monoxide oxidation activity of La1-ySryCr1-xRuxO3 perovskites" in Journal of the Serbian Chemical Society, 65, no. 1 (2000):15-25,
https://doi.org/10.2298/JSC0001015T . .