TY  - CONF
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6408
AB  - An efficient removal of the organic component from the as-synthesized solid in order to access the
internal free space is an important step in the final preparation of the porous materials. Recently, kinetic studies of the cetyltrimethylammonium bromide (CTMAB) removal from the MCM-41 and MCM-48 have shown that the CTMAB removal proceeds by very high activation energy indicating that the interactions of the CTMAB with silica framework are very strong. Preparation of mesoporous SBA-3 proceeds also in the presence of CTMAB; however, in contrast to the synthesis of MCM-41 and MCM-48 which is carried out under alkaline conditions, crystallization of the SBA-3 occurs in strongly acidic solution. This causes the interaction of CTMAB with the SBA-3 network to be different from its interaction with the MCM network since the SBA-3 network is electrically neutral while the MCM network is negatively charged. Thermal degradation of CTMAB inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct kinetic processes, which can be described by the Sestak-Berggren model. The main decomposition step proceeds with Ea = 116±2 kJ/mol which is significantly lower than for the MCM-41 and MCM-48, suggesting that the interaction between CTMAB and the silica network is the dominant factor in the removal of the surfactant. The second decomposition step has a higher Ea  value (153±5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.
C3  - 4th FEZA CONFERENCE Collège de France PARIS
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
IS  - PIII-G34
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6408
ER  - 

@conference{
author = "Rajić, Nevenka and Stojaković, Đorđe and Mrak, Maja and Kaučič, Venčeslav",
year = "2008",
abstract = "An efficient removal of the organic component from the as-synthesized solid in order to access the
internal free space is an important step in the final preparation of the porous materials. Recently, kinetic studies of the cetyltrimethylammonium bromide (CTMAB) removal from the MCM-41 and MCM-48 have shown that the CTMAB removal proceeds by very high activation energy indicating that the interactions of the CTMAB with silica framework are very strong. Preparation of mesoporous SBA-3 proceeds also in the presence of CTMAB; however, in contrast to the synthesis of MCM-41 and MCM-48 which is carried out under alkaline conditions, crystallization of the SBA-3 occurs in strongly acidic solution. This causes the interaction of CTMAB with the SBA-3 network to be different from its interaction with the MCM network since the SBA-3 network is electrically neutral while the MCM network is negatively charged. Thermal degradation of CTMAB inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct kinetic processes, which can be described by the Sestak-Berggren model. The main decomposition step proceeds with Ea = 116±2 kJ/mol which is significantly lower than for the MCM-41 and MCM-48, suggesting that the interaction between CTMAB and the silica network is the dominant factor in the removal of the surfactant. The second decomposition step has a higher Ea  value (153±5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.",
journal = "4th FEZA CONFERENCE Collège de France PARIS",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve",
number = "PIII-G34",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6408"
}

Rajić, N., Stojaković, Đ., Mrak, M.,& Kaučič, V.. (2008). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in 4th FEZA CONFERENCE Collège de France PARIS(PIII-G34).
https://hdl.handle.net/21.15107/rcub_technorep_6408

Rajić N, Stojaković Đ, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in 4th FEZA CONFERENCE Collège de France PARIS. 2008;(PIII-G34).
https://hdl.handle.net/21.15107/rcub_technorep_6408 .

Rajić, Nevenka, Stojaković, Đorđe, Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in 4th FEZA CONFERENCE Collège de France PARIS, no. PIII-G34 (2008),
https://hdl.handle.net/21.15107/rcub_technorep_6408 .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, Đorđe
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1352
AB  - Thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct although partly overlapping kinetic processes, and both of them can be described by the Sestak-Berggren model. The main decomposition step proceeds with E(a) = 116 +/- 2 kJ/mol which is significantly lower than for the mesoporous MCM-41 and MCM-48 suggesting that the interaction between CTMAB and the silica network plays a crucial role in the removal of the surfactant from the as-synthesized material. The second decomposition step has a higher E(a) value (E(a) = 153 +/- 5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.
PB  - Elsevier Science Bv, Amsterdam
T2  - Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
EP  - 980
SP  - 977
VL  - 174
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1352
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, Đorđe and Mrak, Maja and Kaučič, Venčeslav",
year = "2008",
abstract = "Thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct although partly overlapping kinetic processes, and both of them can be described by the Sestak-Berggren model. The main decomposition step proceeds with E(a) = 116 +/- 2 kJ/mol which is significantly lower than for the mesoporous MCM-41 and MCM-48 suggesting that the interaction between CTMAB and the silica network plays a crucial role in the removal of the surfactant from the as-synthesized material. The second decomposition step has a higher E(a) value (E(a) = 153 +/- 5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve",
pages = "980-977",
volume = "174",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1352"
}

Rajić, N., Stojaković, Đ., Mrak, M.,& Kaučič, V.. (2008). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International
Elsevier Science Bv, Amsterdam., 174, 977-980.
https://hdl.handle.net/21.15107/rcub_technorep_1352

Rajić N, Stojaković Đ, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International. 2008;174:977-980.
https://hdl.handle.net/21.15107/rcub_technorep_1352 .

Rajić, Nevenka, Stojaković, Đorđe, Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in Zeolites and Related Materials: Trends, Targets and Challenges, Proceedings of the 4th International, 174 (2008):977-980,
https://hdl.handle.net/21.15107/rcub_technorep_1352 .

TY  - JOUR
AU  - Rajić, Nevenka
AU  - Stojaković, D.
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1208
AB  - Thermal degradation of cetyltrimethylarnmonium bromide (CTMAB) inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct although partly overlapping kinetic processes, and both of them can be described by the Sestak-Berggren model. The main decomposition step proceeds with Ea = 116±2 kJ/mol which is significantly lower than for the mesoporous MCM-41 and MCM-48 suggesting that the interaction between CTMAB and the silica network plays a crucial role in the removal of the surfactant from the as-synthesized material. The second decomposition step has a higher Ea value (Ea = 153±5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.
PB  - Elsevier Science Bv, Amsterdam
T2  - Studies in Surface Science and Catalysis
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
EP  - 980
IS  - B
SP  - 977
VL  - 174
DO  - 10.1016/S0167-2991(08)80053-5
ER  - 

@article{
author = "Rajić, Nevenka and Stojaković, D. and Mrak, Maja and Kaučič, Venčeslav",
year = "2008",
abstract = "Thermal degradation of cetyltrimethylarnmonium bromide (CTMAB) inside the mesoporous SBA-3 has been studied under non-isothermal conditions. There are two distinct although partly overlapping kinetic processes, and both of them can be described by the Sestak-Berggren model. The main decomposition step proceeds with Ea = 116±2 kJ/mol which is significantly lower than for the mesoporous MCM-41 and MCM-48 suggesting that the interaction between CTMAB and the silica network plays a crucial role in the removal of the surfactant from the as-synthesized material. The second decomposition step has a higher Ea value (Ea = 153±5 kJ/mol) than the first step, indicating that it is primarily controlled by the size of the pore openings.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Studies in Surface Science and Catalysis",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve",
pages = "980-977",
number = "B",
volume = "174",
doi = "10.1016/S0167-2991(08)80053-5"
}

Rajić, N., Stojaković, D., Mrak, M.,& Kaučič, V.. (2008). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Studies in Surface Science and Catalysis
Elsevier Science Bv, Amsterdam., 174(B), 977-980.
https://doi.org/10.1016/S0167-2991(08)80053-5

Rajić N, Stojaković D, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Studies in Surface Science and Catalysis. 2008;174(B):977-980.
doi:10.1016/S0167-2991(08)80053-5 .

Rajić, Nevenka, Stojaković, D., Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in Studies in Surface Science and Catalysis, 174, no. B (2008):977-980,
https://doi.org/10.1016/S0167-2991(08)80053-5 . .

TY  - JOUR
AU  - Stojaković, Đorđe
AU  - Rajić, Nevenka
AU  - Mrak, Maja
AU  - Kaučič, Venčeslav
PY  - 2007
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1110
AB  - The thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 was studied under non-isothermal conditions. There are two distinct and complex kinetic processes which partly overlap, each consisting of one dominant and three minor individual processes. The two dominant processes can be described by the Sestak-Berggren model. The main decomposition step (the first dominant process) involves the overcoming of weak interactions between CTMAB and the silica network and proceeds with a lower Ea value (116±2 kJ mol-1) than the second dominant process (153±5 kJ mol-1), which can be explained by the size reduction of the pore openings due to the contraction of the SBA-3 unit cell caused by the removal of CTMAB.
AB  - Izučavano je termičko razlaganje pod neizotermskim uslovima cetiltrimetilamonijum-bromida (CTMAB) unutar mezoporoznog SBA-3. Postoje dva razgovetna i složena kinetička procesa koji se delimično preklapaju, pri čemu se oba sastoje od po jednog preovlađujućeg i tri sporedna individualna procesa. Dva preovlađujuća procesa mogu se opisati pomoću Šestak-Bergrenovog modela. U glavnom stupnju razlaganja (u prvom preovlađujućem procesu) bivaju nadvladane slabe interakcije između CTMAB i rešetke silicijum-dioksida, i taj stupanj se odvija uz manju vrednost Ea (116±2 kJ mol-1). Drugom preovlađujućem procesu odgovara veća vrednost Ea (153±5 kJ mol-1) nego prvom procesu, što se može objasniti smanjenjem veličine otvora pora usled kontrakcije jedinične ćelije SBA-3 izazvane uklanjanjem cetiltrimetilamonijum-bromida.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve
T1  - Kinetičko izučavanje termičkog razlaganja cetiltrimetilamonijum−bromida unutar mezoporoznog molekulskog sita SBA-3
EP  - 1319
IS  - 12
SP  - 1309
VL  - 72
UR  - https://hdl.handle.net/21.15107/rcub_technorep_1110
ER  - 

@article{
author = "Stojaković, Đorđe and Rajić, Nevenka and Mrak, Maja and Kaučič, Venčeslav",
year = "2007",
abstract = "The thermal degradation of cetyltrimethylammonium bromide (CTMAB) inside the mesoporous SBA-3 was studied under non-isothermal conditions. There are two distinct and complex kinetic processes which partly overlap, each consisting of one dominant and three minor individual processes. The two dominant processes can be described by the Sestak-Berggren model. The main decomposition step (the first dominant process) involves the overcoming of weak interactions between CTMAB and the silica network and proceeds with a lower Ea value (116±2 kJ mol-1) than the second dominant process (153±5 kJ mol-1), which can be explained by the size reduction of the pore openings due to the contraction of the SBA-3 unit cell caused by the removal of CTMAB., Izučavano je termičko razlaganje pod neizotermskim uslovima cetiltrimetilamonijum-bromida (CTMAB) unutar mezoporoznog SBA-3. Postoje dva razgovetna i složena kinetička procesa koji se delimično preklapaju, pri čemu se oba sastoje od po jednog preovlađujućeg i tri sporedna individualna procesa. Dva preovlađujuća procesa mogu se opisati pomoću Šestak-Bergrenovog modela. U glavnom stupnju razlaganja (u prvom preovlađujućem procesu) bivaju nadvladane slabe interakcije između CTMAB i rešetke silicijum-dioksida, i taj stupanj se odvija uz manju vrednost Ea (116±2 kJ mol-1). Drugom preovlađujućem procesu odgovara veća vrednost Ea (153±5 kJ mol-1) nego prvom procesu, što se može objasniti smanjenjem veličine otvora pora usled kontrakcije jedinične ćelije SBA-3 izazvane uklanjanjem cetiltrimetilamonijum-bromida.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve, Kinetičko izučavanje termičkog razlaganja cetiltrimetilamonijum−bromida unutar mezoporoznog molekulskog sita SBA-3",
pages = "1319-1309",
number = "12",
volume = "72",
url = "https://hdl.handle.net/21.15107/rcub_technorep_1110"
}

Stojaković, Đ., Rajić, N., Mrak, M.,& Kaučič, V.. (2007). A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 72(12), 1309-1319.
https://hdl.handle.net/21.15107/rcub_technorep_1110

Stojaković Đ, Rajić N, Mrak M, Kaučič V. A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve. in Journal of the Serbian Chemical Society. 2007;72(12):1309-1319.
https://hdl.handle.net/21.15107/rcub_technorep_1110 .

Stojaković, Đorđe, Rajić, Nevenka, Mrak, Maja, Kaučič, Venčeslav, "A kinetic study of the thermal degradation of cetyltrimethylammonium bromide inside the mesoporous SBA-3 molecular sieve" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1309-1319,
https://hdl.handle.net/21.15107/rcub_technorep_1110 .