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.
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 .
