TY  - JOUR
AU  - Hercigonja, Radmila
AU  - Rakić, Vesna
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3787
AB  - In this work, the values of entropy changes related to n-hexane adsorption onto cation exchanged Y zeolite were calculated from differential heats. Various transition metal cations (Co2+, Ni2+, Zn2+ and Cd2+) were introduced into the lattice of the parent NaY, and the existence of enthalpy-entropy compensation effect related to n-hexane adsorption, id. est, the linearity of -triangle H vs. -triangle S plots was examined. The compensation effect was confirmed for all investigated zeolites. The compensation effect can be comprehended as governed by ion-induced dipole interaction between highly polarizing cationic centers in zeolite and nonopolar n-hexane molecules. Finally, the compensation effect and so the compensation temperature were found to depend on the type of charge-balancing cation (charge, size and electronic configuration).
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Enthalpy-entropy Compensation for n-hexane Adsorption on Y Zeolite Containing Transition Metal Cations
EP  - 88
IS  - 1
SP  - 83
VL  - 47
DO  - 10.2298/SOS1501091H
ER  - 

@article{
author = "Hercigonja, Radmila and Rakić, Vesna",
year = "2015",
abstract = "In this work, the values of entropy changes related to n-hexane adsorption onto cation exchanged Y zeolite were calculated from differential heats. Various transition metal cations (Co2+, Ni2+, Zn2+ and Cd2+) were introduced into the lattice of the parent NaY, and the existence of enthalpy-entropy compensation effect related to n-hexane adsorption, id. est, the linearity of -triangle H vs. -triangle S plots was examined. The compensation effect was confirmed for all investigated zeolites. The compensation effect can be comprehended as governed by ion-induced dipole interaction between highly polarizing cationic centers in zeolite and nonopolar n-hexane molecules. Finally, the compensation effect and so the compensation temperature were found to depend on the type of charge-balancing cation (charge, size and electronic configuration).",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Enthalpy-entropy Compensation for n-hexane Adsorption on Y Zeolite Containing Transition Metal Cations",
pages = "88-83",
number = "1",
volume = "47",
doi = "10.2298/SOS1501091H"
}

Hercigonja, R.,& Rakić, V.. (2015). Enthalpy-entropy Compensation for n-hexane Adsorption on Y Zeolite Containing Transition Metal Cations. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 47(1), 83-88.
https://doi.org/10.2298/SOS1501091H

Hercigonja R, Rakić V. Enthalpy-entropy Compensation for n-hexane Adsorption on Y Zeolite Containing Transition Metal Cations. in Science of Sintering. 2015;47(1):83-88.
doi:10.2298/SOS1501091H .

Hercigonja, Radmila, Rakić, Vesna, "Enthalpy-entropy Compensation for n-hexane Adsorption on Y Zeolite Containing Transition Metal Cations" in Science of Sintering, 47, no. 1 (2015):83-88,
https://doi.org/10.2298/SOS1501091H . .

TY  - JOUR
AU  - Hercigonja, Radmila
AU  - Rac, Vladislav
AU  - Rakić, Vesna
AU  - Auroux, Aline
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3743
AB  - Besides its importance concerning fundamental studies on gas adsorption in narrow pores, investigation of the commensurate freezing of a fluid within a zeolite is of practical importance in the application of zeolites in the processes of adsorption, separation and catalysis. In this work, the adsorption of n-hexane on HZSM-5 and its transition metal ion-exchanged modified forms was studied at 303 K by means of microcalorimetry. The thermal molar entropies changes of adsorption were calculated and thereby, the freezing-like behaviour of n-hexane inside the structure of the zeolite as a confinement media was noticed. This effect is governed by the attractive interactions between n-hexane molecules and the pore walls, and is influenced by the length of the pores and the nature of the charge-balancing cations. Among the investigated zeolites, a solid-like phase of n-hexane in the pores of zeolites with Fe(II) ions was the most similar to solid bulk n-hexane, while Cu(II) ions contributed to the lowest ordering of the obtained solid-like n-hexane phase.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Effect of transition metal cations on the commensurate freezing of n-hexane confined in micropores of ZSM-5
EP  - 1309
IS  - 10
SP  - 1297
VL  - 80
DO  - 10.2298/JSC150203032H
ER  - 

@article{
author = "Hercigonja, Radmila and Rac, Vladislav and Rakić, Vesna and Auroux, Aline",
year = "2015",
abstract = "Besides its importance concerning fundamental studies on gas adsorption in narrow pores, investigation of the commensurate freezing of a fluid within a zeolite is of practical importance in the application of zeolites in the processes of adsorption, separation and catalysis. In this work, the adsorption of n-hexane on HZSM-5 and its transition metal ion-exchanged modified forms was studied at 303 K by means of microcalorimetry. The thermal molar entropies changes of adsorption were calculated and thereby, the freezing-like behaviour of n-hexane inside the structure of the zeolite as a confinement media was noticed. This effect is governed by the attractive interactions between n-hexane molecules and the pore walls, and is influenced by the length of the pores and the nature of the charge-balancing cations. Among the investigated zeolites, a solid-like phase of n-hexane in the pores of zeolites with Fe(II) ions was the most similar to solid bulk n-hexane, while Cu(II) ions contributed to the lowest ordering of the obtained solid-like n-hexane phase.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Effect of transition metal cations on the commensurate freezing of n-hexane confined in micropores of ZSM-5",
pages = "1309-1297",
number = "10",
volume = "80",
doi = "10.2298/JSC150203032H"
}

Hercigonja, R., Rac, V., Rakić, V.,& Auroux, A.. (2015). Effect of transition metal cations on the commensurate freezing of n-hexane confined in micropores of ZSM-5. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 80(10), 1297-1309.
https://doi.org/10.2298/JSC150203032H

Hercigonja R, Rac V, Rakić V, Auroux A. Effect of transition metal cations on the commensurate freezing of n-hexane confined in micropores of ZSM-5. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2015;80(10):1297-1309.
doi:10.2298/JSC150203032H .

Hercigonja, Radmila, Rac, Vladislav, Rakić, Vesna, Auroux, Aline, "Effect of transition metal cations on the commensurate freezing of n-hexane confined in micropores of ZSM-5" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 80, no. 10 (2015):1297-1309,
https://doi.org/10.2298/JSC150203032H . .

TY  - JOUR
AU  - Hercigonja, Radmila
AU  - Rac, Vladislav
AU  - Rakić, Vesna
AU  - Auroux, Aline
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2994
AB  - In this work, the values of entropy changes related to n-hexane adsorption onto ion-exchanged ZSM-5 zeolites were calculated from differential heats, obtained from microcalorimetric experiments. The existence of enthalpy-entropy compensation effect, evidenced by the linearity of -Lambda H vs. -Lambda S plots and characteristic for all investigated ZSM-5 zeolites, was found. In the case of ZSM-5 structure, modifying the zeolite structure by ion-exchange gives rise to changes in the heats of adsorption and adsorption entropy in the same manner. The factors that can influence the appearance of entropy-enthalpy compensation were discussed. It was found that compensation effect is governed by ion-induced dipole interaction between highly polarizing cationic centres in zeolite and nonopolar n-hexane molecules, and hence, depends on the size, charge and electron configuration of the cation. It was found also that the compensation temperature is in correlation with the number of zeolites' strong acid centres. Contrary to the adsorption of n-hexane on ZSM-5 zeolites, compensation effect was not found for the adsorption of the same gas on faujasite-type zeolites.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Enthalpy-entropy compensation for n-hexane adsorption on HZSM-5 containing transition metal ions
EP  - 117
SP  - 112
VL  - 48
DO  - 10.1016/j.jct.2011.12.016
ER  - 

@article{
author = "Hercigonja, Radmila and Rac, Vladislav and Rakić, Vesna and Auroux, Aline",
year = "2012",
abstract = "In this work, the values of entropy changes related to n-hexane adsorption onto ion-exchanged ZSM-5 zeolites were calculated from differential heats, obtained from microcalorimetric experiments. The existence of enthalpy-entropy compensation effect, evidenced by the linearity of -Lambda H vs. -Lambda S plots and characteristic for all investigated ZSM-5 zeolites, was found. In the case of ZSM-5 structure, modifying the zeolite structure by ion-exchange gives rise to changes in the heats of adsorption and adsorption entropy in the same manner. The factors that can influence the appearance of entropy-enthalpy compensation were discussed. It was found that compensation effect is governed by ion-induced dipole interaction between highly polarizing cationic centres in zeolite and nonopolar n-hexane molecules, and hence, depends on the size, charge and electron configuration of the cation. It was found also that the compensation temperature is in correlation with the number of zeolites' strong acid centres. Contrary to the adsorption of n-hexane on ZSM-5 zeolites, compensation effect was not found for the adsorption of the same gas on faujasite-type zeolites.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Enthalpy-entropy compensation for n-hexane adsorption on HZSM-5 containing transition metal ions",
pages = "117-112",
volume = "48",
doi = "10.1016/j.jct.2011.12.016"
}

Hercigonja, R., Rac, V., Rakić, V.,& Auroux, A.. (2012). Enthalpy-entropy compensation for n-hexane adsorption on HZSM-5 containing transition metal ions. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 48, 112-117.
https://doi.org/10.1016/j.jct.2011.12.016

Hercigonja R, Rac V, Rakić V, Auroux A. Enthalpy-entropy compensation for n-hexane adsorption on HZSM-5 containing transition metal ions. in Journal of Chemical Thermodynamics. 2012;48:112-117.
doi:10.1016/j.jct.2011.12.016 .

Hercigonja, Radmila, Rac, Vladislav, Rakić, Vesna, Auroux, Aline, "Enthalpy-entropy compensation for n-hexane adsorption on HZSM-5 containing transition metal ions" in Journal of Chemical Thermodynamics, 48 (2012):112-117,
https://doi.org/10.1016/j.jct.2011.12.016 . .

TY  - JOUR
AU  - Stošić, Dušan
AU  - Damjanović, Ljiljana
AU  - Hercigonja, Radmila
AU  - Dondur, Vera
AU  - Rac, Vladislav
AU  - Rakić, Vesna
PY  - 2008
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1647
AB  - L-histidine, a naturally occurring amino acid, was incorporated inside the supercages of FAU type zeolite in a form of Me-complex entity (Me = Cu(II), Zn(II), Fe(III)). The preparation was done either by ion-exchange procedure, or previously prepared Me-histidine complex was incorporated into the a cages of Y zeolite by occlusion. The preparation procedure was found to be a very important factor, as well as the amount of metal complex loaded on the zeolite. The characterization of obtained samples was performed using Diffuse Reflectance Ultraviolet-Visible Spectroscopy (DRUV-Vis), 13C MAS NMR and Infrared Spectroscopy (FTIR). It was noticed that 1-hostidine interacted with the zeolitic framework, and with the extra-framework cation, as well. The results obtained by TG-DSC/MAS technique, revealed that the thermal stability of incorporated histidine was increased, in comparison with that one of pure histidine.
AB  - U ovom radu, Me-histidin (Me = Zn(II), Cu(II), Fe(III)) kompleksi ugrađivani su u strukturu Yzeolita, primenom dva različita postupka: (1) Me-histidin kompleksi su pravljeni u dejonizovanoj vodi i zatim mešani sa NaY zeolitom, (2) histidinje rastvoren u vodi i u rastvor su dodavani jonski izmenjeni Y zeoliti. UV-spektroskopijom tečne faze je utvrđeno da je proces imobilizacije izvršen za 24 h. Ovako dobijem čvrsti materijali su detaljno okarakterisani hemijski i metodama XRD, NMR, IR, DR UV-VIS, dok su njihove termalne stabilnosti ispitivane primenom TG-DSC/MAS tehnike. Dobijem rezultati omogućili su poređenje osobina sintetisanih uzoraka.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - The incorporation of Me-histidine complexes in the structure of FAU-type zeolite: Characterization of the obtained materials
T1  - Ugradnja Me-histidin kompleksa u strukturu FAU zeolita - karakterizacija odbijenih materijala
EP  - 130
IS  - 3
SP  - 125
VL  - 62
DO  - 10.2298/HEMIND0803125S
ER  - 

@article{
author = "Stošić, Dušan and Damjanović, Ljiljana and Hercigonja, Radmila and Dondur, Vera and Rac, Vladislav and Rakić, Vesna",
year = "2008",
abstract = "L-histidine, a naturally occurring amino acid, was incorporated inside the supercages of FAU type zeolite in a form of Me-complex entity (Me = Cu(II), Zn(II), Fe(III)). The preparation was done either by ion-exchange procedure, or previously prepared Me-histidine complex was incorporated into the a cages of Y zeolite by occlusion. The preparation procedure was found to be a very important factor, as well as the amount of metal complex loaded on the zeolite. The characterization of obtained samples was performed using Diffuse Reflectance Ultraviolet-Visible Spectroscopy (DRUV-Vis), 13C MAS NMR and Infrared Spectroscopy (FTIR). It was noticed that 1-hostidine interacted with the zeolitic framework, and with the extra-framework cation, as well. The results obtained by TG-DSC/MAS technique, revealed that the thermal stability of incorporated histidine was increased, in comparison with that one of pure histidine., U ovom radu, Me-histidin (Me = Zn(II), Cu(II), Fe(III)) kompleksi ugrađivani su u strukturu Yzeolita, primenom dva različita postupka: (1) Me-histidin kompleksi su pravljeni u dejonizovanoj vodi i zatim mešani sa NaY zeolitom, (2) histidinje rastvoren u vodi i u rastvor su dodavani jonski izmenjeni Y zeoliti. UV-spektroskopijom tečne faze je utvrđeno da je proces imobilizacije izvršen za 24 h. Ovako dobijem čvrsti materijali su detaljno okarakterisani hemijski i metodama XRD, NMR, IR, DR UV-VIS, dok su njihove termalne stabilnosti ispitivane primenom TG-DSC/MAS tehnike. Dobijem rezultati omogućili su poređenje osobina sintetisanih uzoraka.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "The incorporation of Me-histidine complexes in the structure of FAU-type zeolite: Characterization of the obtained materials, Ugradnja Me-histidin kompleksa u strukturu FAU zeolita - karakterizacija odbijenih materijala",
pages = "130-125",
number = "3",
volume = "62",
doi = "10.2298/HEMIND0803125S"
}

Stošić, D., Damjanović, L., Hercigonja, R., Dondur, V., Rac, V.,& Rakić, V.. (2008). The incorporation of Me-histidine complexes in the structure of FAU-type zeolite: Characterization of the obtained materials. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 62(3), 125-130.
https://doi.org/10.2298/HEMIND0803125S

Stošić D, Damjanović L, Hercigonja R, Dondur V, Rac V, Rakić V. The incorporation of Me-histidine complexes in the structure of FAU-type zeolite: Characterization of the obtained materials. in Hemijska industrija. 2008;62(3):125-130.
doi:10.2298/HEMIND0803125S .

Stošić, Dušan, Damjanović, Ljiljana, Hercigonja, Radmila, Dondur, Vera, Rac, Vladislav, Rakić, Vesna, "The incorporation of Me-histidine complexes in the structure of FAU-type zeolite: Characterization of the obtained materials" in Hemijska industrija, 62, no. 3 (2008):125-130,
https://doi.org/10.2298/HEMIND0803125S . .

TY  - CONF
AU  - Dondur, Vera
AU  - Rakić, Vesna
AU  - Damjanović, Ljiljana
AU  - Hercigonja, Radmila
AU  - Auroux, Aline
PY  - 2006
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1341
AB  - Temperature-programmed desorption coupled with mass spectrometer as a detector (TPD), IR and C-13 NMR measurements are used to study the adsorption of n-hexane on hydrated HZSM-5 and NH(4)ZSM-5 zeolites. The C-13 NMR measurements show that n-hexane can access the pore structure of ZSM-5 zeolites previously saturated with water. TPD spectra of n-hexane are monitored in the temperature region 50-300 degrees C, in the case of fully or partially hydrated samples; two-stage desorption of n-hexane is found. Simultaneous desorption of water and n-hexane in the same temperature region are found, in all investigated samples.
PB  - Springer, Dordrecht
C3  - Journal of Thermal Analysis and Calorimetry
T1  - Temperature-programmed desorption of n-hexane from hydrated HZSM-5 and NH(4)ZSM-5 zeolites
EP  - 238
IS  - 1
SP  - 233
VL  - 84
DO  - 10.1007/s10973-005-7160-3
ER  - 

@conference{
author = "Dondur, Vera and Rakić, Vesna and Damjanović, Ljiljana and Hercigonja, Radmila and Auroux, Aline",
year = "2006",
abstract = "Temperature-programmed desorption coupled with mass spectrometer as a detector (TPD), IR and C-13 NMR measurements are used to study the adsorption of n-hexane on hydrated HZSM-5 and NH(4)ZSM-5 zeolites. The C-13 NMR measurements show that n-hexane can access the pore structure of ZSM-5 zeolites previously saturated with water. TPD spectra of n-hexane are monitored in the temperature region 50-300 degrees C, in the case of fully or partially hydrated samples; two-stage desorption of n-hexane is found. Simultaneous desorption of water and n-hexane in the same temperature region are found, in all investigated samples.",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Temperature-programmed desorption of n-hexane from hydrated HZSM-5 and NH(4)ZSM-5 zeolites",
pages = "238-233",
number = "1",
volume = "84",
doi = "10.1007/s10973-005-7160-3"
}

Dondur, V., Rakić, V., Damjanović, L., Hercigonja, R.,& Auroux, A.. (2006). Temperature-programmed desorption of n-hexane from hydrated HZSM-5 and NH(4)ZSM-5 zeolites. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 84(1), 233-238.
https://doi.org/10.1007/s10973-005-7160-3

Dondur V, Rakić V, Damjanović L, Hercigonja R, Auroux A. Temperature-programmed desorption of n-hexane from hydrated HZSM-5 and NH(4)ZSM-5 zeolites. in Journal of Thermal Analysis and Calorimetry. 2006;84(1):233-238.
doi:10.1007/s10973-005-7160-3 .

Dondur, Vera, Rakić, Vesna, Damjanović, Ljiljana, Hercigonja, Radmila, Auroux, Aline, "Temperature-programmed desorption of n-hexane from hydrated HZSM-5 and NH(4)ZSM-5 zeolites" in Journal of Thermal Analysis and Calorimetry, 84, no. 1 (2006):233-238,
https://doi.org/10.1007/s10973-005-7160-3 . .

TY  - JOUR
AU  - Hercigonja, Radmila
AU  - Dondur, Vera
AU  - Rakić, Vesna
PY  - 2005
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/1098
AB  - In this work, the free energy changes and entropy changes of adsorption of n-hexane on zeolites of the MxNa87-2xX (M=Co,Ni,Zn,Cd) type were determined using their isosteric sorption heats. It was found that the exchange of Na ions in NaX with bivalent cations (Co, Ni, Zn, Cd) significantly alters the adsorption characteristics of NaX zeolite. The free energy changes and entropy changes of n-hexane adsorption were dependent on the surface coverage and on the nature of the charge-balancing cation. The specific influence of the exchanged cations on the free energy changes and entropy changes of sorption of n-hexane originates from the size, location and electronic configuration of the cation.
AB  - U ovom radu su određene promene slobodne energije i promena entropije adsorpcije n-heksana na zeolitima tipa MxNa87-2xX (M=Co,Ni,Zn,Cd) na osnovu izosternih toplota sorpcije. Pokazano je da izmena Na+ jona u NaX zeolitu dvovalentnim katjonima (Co,Ni,Zn,Cd) značajno menja adsorpcione karakteristike NaX zeolita. Takođe je utvrđeno da promena slobodne energije i promena entropije adsorpcije n-heksana zavisi i od stepena pokrivenosti površine zeolita.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites
T1  - Termodinamika adsorpcije n-heksana na jonski izmenjenim X zeolitima
EP  - 1418
IS  - 12
SP  - 1409
VL  - 70
DO  - 10.2298/JSC0512409H
ER  - 

@article{
author = "Hercigonja, Radmila and Dondur, Vera and Rakić, Vesna",
year = "2005",
abstract = "In this work, the free energy changes and entropy changes of adsorption of n-hexane on zeolites of the MxNa87-2xX (M=Co,Ni,Zn,Cd) type were determined using their isosteric sorption heats. It was found that the exchange of Na ions in NaX with bivalent cations (Co, Ni, Zn, Cd) significantly alters the adsorption characteristics of NaX zeolite. The free energy changes and entropy changes of n-hexane adsorption were dependent on the surface coverage and on the nature of the charge-balancing cation. The specific influence of the exchanged cations on the free energy changes and entropy changes of sorption of n-hexane originates from the size, location and electronic configuration of the cation., U ovom radu su određene promene slobodne energije i promena entropije adsorpcije n-heksana na zeolitima tipa MxNa87-2xX (M=Co,Ni,Zn,Cd) na osnovu izosternih toplota sorpcije. Pokazano je da izmena Na+ jona u NaX zeolitu dvovalentnim katjonima (Co,Ni,Zn,Cd) značajno menja adsorpcione karakteristike NaX zeolita. Takođe je utvrđeno da promena slobodne energije i promena entropije adsorpcije n-heksana zavisi i od stepena pokrivenosti površine zeolita.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites, Termodinamika adsorpcije n-heksana na jonski izmenjenim X zeolitima",
pages = "1418-1409",
number = "12",
volume = "70",
doi = "10.2298/JSC0512409H"
}

Hercigonja, R., Dondur, V.,& Rakić, V.. (2005). A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 70(12), 1409-1418.
https://doi.org/10.2298/JSC0512409H

Hercigonja R, Dondur V, Rakić V. A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2005;70(12):1409-1418.
doi:10.2298/JSC0512409H .

Hercigonja, Radmila, Dondur, Vera, Rakić, Vesna, "A study of the adsorption thermodynamics of n-hexane on ion-exchanged X zeolites" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 70, no. 12 (2005):1409-1418,
https://doi.org/10.2298/JSC0512409H . .

TY  - JOUR
AU  - Rakić, Vesna
AU  - Dondur, Vera
AU  - Hercigonja, Radmila
PY  - 2003
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/661
AB  - In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn2+, Co2 Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120–2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites.
AB  - U ovom radu ispitivana je adsorpcija ugljen-monoksida na izmenjenim zeolitima (Mn2+, Co2+, Ni2+) tipa X, Y i mordenita primenom infracrvene spektroskopije sa Furijeovom analizom (FTIR). Adsorpcijom CO na sobnoj temperaturi nastaju složene trake u spektralnoj oblasti od 2120 do 2200 cm-1.Uočeno je da frekvencija trake na oko 2200 cm-1 zavisi i od katjona prisutnog u strukturi, i od sastava same zeolitske rešetke. Uočeno je takođe da frekvencije traka na oko 1600 cm-1 zavise od strukture, odnosno od Si/Al odnosa ispitivanih zeolita.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites
T1  - FTIR studija adsorpcije ugljen-monoksida na izmenjenim zeolitima tipa X, Y i mordenita
EP  - 416
IS  - 4-5
SP  - 409
VL  - 68
DO  - 10.2298/JSC0305409R
ER  - 

@article{
author = "Rakić, Vesna and Dondur, Vera and Hercigonja, Radmila",
year = "2003",
abstract = "In this work Fourier transform infrared (FTIR) study has been applied to study the adsorption of carbon monoxide on transition metal (Mn2+, Co2 Ni2+) ion-exchanged zeolites type Y, X and mordenites. The adsorption of CO at room temperature produces overlapping IR absorption bands in the 2120–2200 cm-1 region. The frequency of the band around 2200 cm-1 is found to be dependent not only on the charge-balancing transition metal cation but also on the framework composition. The frequencies of the band near 1600 cm-1 was found to be dependent on the Si/Al ratio of the investigated zeolites., U ovom radu ispitivana je adsorpcija ugljen-monoksida na izmenjenim zeolitima (Mn2+, Co2+, Ni2+) tipa X, Y i mordenita primenom infracrvene spektroskopije sa Furijeovom analizom (FTIR). Adsorpcijom CO na sobnoj temperaturi nastaju složene trake u spektralnoj oblasti od 2120 do 2200 cm-1.Uočeno je da frekvencija trake na oko 2200 cm-1 zavisi i od katjona prisutnog u strukturi, i od sastava same zeolitske rešetke. Uočeno je takođe da frekvencije traka na oko 1600 cm-1 zavise od strukture, odnosno od Si/Al odnosa ispitivanih zeolita.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites, FTIR studija adsorpcije ugljen-monoksida na izmenjenim zeolitima tipa X, Y i mordenita",
pages = "416-409",
number = "4-5",
volume = "68",
doi = "10.2298/JSC0305409R"
}

Rakić, V., Dondur, V.,& Hercigonja, R.. (2003). FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 68(4-5), 409-416.
https://doi.org/10.2298/JSC0305409R

Rakić V, Dondur V, Hercigonja R. FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2003;68(4-5):409-416.
doi:10.2298/JSC0305409R .

Rakić, Vesna, Dondur, Vera, Hercigonja, Radmila, "FTIR study of carbon monoxide adsorption on ion-exchanged X, Y and mordenite type zeolites" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 68, no. 4-5 (2003):409-416,
https://doi.org/10.2298/JSC0305409R . .

TY  - CONF
AU  - Rakić, Vesna
AU  - Dondur, Vera
AU  - Hercigonja, Radmila
AU  - Andrić, Velibor
PY  - 2003
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/601
AB  - The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (T(M)approximate to620-690degreesC) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell). The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (E(des)approximate to240 kJ mol(-1), Aapproximate to10(11) s(-1)).
PB  - Springer, Dordrecht
C3  - Journal of Thermal Analysis and Calorimetry
T1  - The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide
EP  - 767
IS  - 3
SP  - 761
VL  - 72
DO  - 10.1023/A:1025049727731
ER  - 

@conference{
author = "Rakić, Vesna and Dondur, Vera and Hercigonja, Radmila and Andrić, Velibor",
year = "2003",
abstract = "The active sites of hydrogen-exchanged Y zeolite (HY) and dealuminated (HDY) zeolites are investigated by TPD of carbon monoxide. Only the high temperature TPD spectra of CO (T(M)approximate to620-690degreesC) were observed, meaning that CO molecules interact with very strong acid sites. The amounts of CO bonded on these sites are small (less than 1 molecule per unit cell). The strong influence of dealumination on the coverage degree is found. The calculated values for kinetic parameters indicate chemisorption of CO in the investigated systems (E(des)approximate to240 kJ mol(-1), Aapproximate to10(11) s(-1)).",
publisher = "Springer, Dordrecht",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide",
pages = "767-761",
number = "3",
volume = "72",
doi = "10.1023/A:1025049727731"
}

Rakić, V., Dondur, V., Hercigonja, R.,& Andrić, V.. (2003). The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide. in Journal of Thermal Analysis and Calorimetry
Springer, Dordrecht., 72(3), 761-767.
https://doi.org/10.1023/A:1025049727731

Rakić V, Dondur V, Hercigonja R, Andrić V. The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide. in Journal of Thermal Analysis and Calorimetry. 2003;72(3):761-767.
doi:10.1023/A:1025049727731 .

Rakić, Vesna, Dondur, Vera, Hercigonja, Radmila, Andrić, Velibor, "The investigation of strong active sites of dealuminated Y-type zeolite by TPD of carbon monoxide" in Journal of Thermal Analysis and Calorimetry, 72, no. 3 (2003):761-767,
https://doi.org/10.1023/A:1025049727731 . .

TY  - CONF
AU  - Rakić, Vesna
AU  - Dondur, Vera
AU  - Hercigonja, Radmila
PY  - 2001
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/330
AB  - The interactions of carbon monoxide with Lewis acid sites of zeolites were investigated using microcalorimetric and temperature programmed desorption (TPD) techniques. Carbon monoxide was adsorbed at 25 degreesC on transition-metal ion-exchanged FAU (Y and X) and MOR type zeolites. The differential heats of adsorption (Q(dif)) indicate the heterogeneity of the acid sites, in all the investigated systems. The specific interactions of CO with the strongest acid sites were recognized. The results of TPD confirm that CO molecules were adsorbed on the sites of different strength.
PB  - Elsevier, Amsterdam
C3  - Thermochimica Acta
T1  - Thermal effects of the interactions of carbon monoxide with zeolites
EP  - 84
IS  - 1-2
SP  - 77
VL  - 379
DO  - 10.1016/S0040-6031(01)00605-0
ER  - 

@conference{
author = "Rakić, Vesna and Dondur, Vera and Hercigonja, Radmila",
year = "2001",
abstract = "The interactions of carbon monoxide with Lewis acid sites of zeolites were investigated using microcalorimetric and temperature programmed desorption (TPD) techniques. Carbon monoxide was adsorbed at 25 degreesC on transition-metal ion-exchanged FAU (Y and X) and MOR type zeolites. The differential heats of adsorption (Q(dif)) indicate the heterogeneity of the acid sites, in all the investigated systems. The specific interactions of CO with the strongest acid sites were recognized. The results of TPD confirm that CO molecules were adsorbed on the sites of different strength.",
publisher = "Elsevier, Amsterdam",
journal = "Thermochimica Acta",
title = "Thermal effects of the interactions of carbon monoxide with zeolites",
pages = "84-77",
number = "1-2",
volume = "379",
doi = "10.1016/S0040-6031(01)00605-0"
}

Rakić, V., Dondur, V.,& Hercigonja, R.. (2001). Thermal effects of the interactions of carbon monoxide with zeolites. in Thermochimica Acta
Elsevier, Amsterdam., 379(1-2), 77-84.
https://doi.org/10.1016/S0040-6031(01)00605-0

Rakić V, Dondur V, Hercigonja R. Thermal effects of the interactions of carbon monoxide with zeolites. in Thermochimica Acta. 2001;379(1-2):77-84.
doi:10.1016/S0040-6031(01)00605-0 .

Rakić, Vesna, Dondur, Vera, Hercigonja, Radmila, "Thermal effects of the interactions of carbon monoxide with zeolites" in Thermochimica Acta, 379, no. 1-2 (2001):77-84,
https://doi.org/10.1016/S0040-6031(01)00605-0 . .

TY  - JOUR
AU  - Rakić, Vesna
AU  - Hercigonja, Radmila
AU  - Dondur, Vera
PY  - 1999
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/156
AB  - The interaction of carbon monoxide with the cationic Lewis acid sites of transition-metal (Fe2+, Co2+, Ni2+) and Cu2+-exchanged Y and X zeolites was investigated by Fourier transform infrared spectroscopy (FTIR) and temperature-programmed desorption (TPD). The activation of the sample, the adsorption (at room temperature) of CO and the detection of desorbed molecular species were done in situ, either with FTIR or with a mass spectrometer, in gas-flow systems. During the adsorption of CO from the gas stream, a low surface coverage (between two and seven molecules per unit cell) was achieved. In the case of CuY and CuX zeolites, the TPD/MAS spectra exhibit only CO signals. During adsorption of CO, IR absorption bands in the 2200-2000 cm(-1) spectral region, characteristic for symmetric stretching of CO adsorbed on zeolites, were collected in the FTIR spectra, indicating molecular adsorption of CO on Cu2+-exchanged samples. In the case of all other samples investigated, disproportionation of CO was noticed during its adsorption and temperature-programmed desorption. IR absorption bands near 2350 cm(-1), characteristic for nu(3) asymmetric stretching of weakly bound CO2 on zeolites, and IR absorption bands in the 2200-2000 cm(-1) spectral region were collected during adsorption of CO on Fe2+-, Co2+- and Ni2+-exchanged samples. In the TPD/MAS spectra both CO and CO2 signals were monitored. Significant amounts of carbon deposits (between two and nine carbon atoms deposited per unit cell of the zeolite) were found after adsorption and TPD procedures.
PB  - Elsevier, Amsterdam
T2  - Microporous and Mesoporous Materials
T1  - CO interaction with zeolites studied by TPD and FTIR: transition-metal ion-exchanged FAU-type zeolites
EP  - 39
IS  - 1
SP  - 27
VL  - 27
DO  - 10.1016/S1387-1811(98)00224-8
ER  - 

@article{
author = "Rakić, Vesna and Hercigonja, Radmila and Dondur, Vera",
year = "1999",
abstract = "The interaction of carbon monoxide with the cationic Lewis acid sites of transition-metal (Fe2+, Co2+, Ni2+) and Cu2+-exchanged Y and X zeolites was investigated by Fourier transform infrared spectroscopy (FTIR) and temperature-programmed desorption (TPD). The activation of the sample, the adsorption (at room temperature) of CO and the detection of desorbed molecular species were done in situ, either with FTIR or with a mass spectrometer, in gas-flow systems. During the adsorption of CO from the gas stream, a low surface coverage (between two and seven molecules per unit cell) was achieved. In the case of CuY and CuX zeolites, the TPD/MAS spectra exhibit only CO signals. During adsorption of CO, IR absorption bands in the 2200-2000 cm(-1) spectral region, characteristic for symmetric stretching of CO adsorbed on zeolites, were collected in the FTIR spectra, indicating molecular adsorption of CO on Cu2+-exchanged samples. In the case of all other samples investigated, disproportionation of CO was noticed during its adsorption and temperature-programmed desorption. IR absorption bands near 2350 cm(-1), characteristic for nu(3) asymmetric stretching of weakly bound CO2 on zeolites, and IR absorption bands in the 2200-2000 cm(-1) spectral region were collected during adsorption of CO on Fe2+-, Co2+- and Ni2+-exchanged samples. In the TPD/MAS spectra both CO and CO2 signals were monitored. Significant amounts of carbon deposits (between two and nine carbon atoms deposited per unit cell of the zeolite) were found after adsorption and TPD procedures.",
publisher = "Elsevier, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "CO interaction with zeolites studied by TPD and FTIR: transition-metal ion-exchanged FAU-type zeolites",
pages = "39-27",
number = "1",
volume = "27",
doi = "10.1016/S1387-1811(98)00224-8"
}

Rakić, V., Hercigonja, R.,& Dondur, V.. (1999). CO interaction with zeolites studied by TPD and FTIR: transition-metal ion-exchanged FAU-type zeolites. in Microporous and Mesoporous Materials
Elsevier, Amsterdam., 27(1), 27-39.
https://doi.org/10.1016/S1387-1811(98)00224-8

Rakić V, Hercigonja R, Dondur V. CO interaction with zeolites studied by TPD and FTIR: transition-metal ion-exchanged FAU-type zeolites. in Microporous and Mesoporous Materials. 1999;27(1):27-39.
doi:10.1016/S1387-1811(98)00224-8 .

Rakić, Vesna, Hercigonja, Radmila, Dondur, Vera, "CO interaction with zeolites studied by TPD and FTIR: transition-metal ion-exchanged FAU-type zeolites" in Microporous and Mesoporous Materials, 27, no. 1 (1999):27-39,
https://doi.org/10.1016/S1387-1811(98)00224-8 . .