The competitive adsorption of aromatic hydrocarbons (benzene, methyl- and ethyl-benzene) and water on FeZSM-5 zeolites have been investigated by means of temperature-programmed desorption coupled with mass spectrometry (TPD/MS). The incorporation of iron in zeolite was done by aqueous ion exchange using dilute solutions of Fe complexes (ferric citrate and ferrous oxalate) and ferric nitrate. Diffuse reflectance UV-Vis spectroscopy and temperature-programmed reduction (TPR) were applied to characterize active sites on investigated zeolites. The existence of different iron species on FeZSM-5 zeolites was revealed. It has been demonstrated that the activity of the Fe exchanged zeolite depends on the iron salt used for ion exchange. The isolated, dispersed ions, which are often considered to be essential for adsorption and catalysis, were obtained with high yield only by ion exchange in the presence of ferrous oxalate. TPD/MS measurements show that aromatic hydrocarbons adsorb on specific,... strong active sites in hydrated zeolites. The binding occurred when organic molecules replace water previously adsorbed at the same sites. Benzene showed non-dissociative adsorption/desorption, while new mass fragments were recorded during methyl-benzene and ethyl-benzene desorption implying their dissociative adsorption/desorption on active sites in hydrated zeolites.
TY - JOUR
AU - Milojević-Rakić, M.
AU - Dondur, Vera
AU - Damjanović-Vasilić, Ljiljana
AU - Rac, Vladislav
AU - Rakić, Vesna
PY - 2018
UR - http://aspace.agrif.bg.ac.rs/handle/123456789/4737
AB - The competitive adsorption of aromatic hydrocarbons (benzene, methyl- and ethyl-benzene) and water on FeZSM-5 zeolites have been investigated by means of temperature-programmed desorption coupled with mass spectrometry (TPD/MS). The incorporation of iron in zeolite was done by aqueous ion exchange using dilute solutions of Fe complexes (ferric citrate and ferrous oxalate) and ferric nitrate. Diffuse reflectance UV-Vis spectroscopy and temperature-programmed reduction (TPR) were applied to characterize active sites on investigated zeolites. The existence of different iron species on FeZSM-5 zeolites was revealed. It has been demonstrated that the activity of the Fe exchanged zeolite depends on the iron salt used for ion exchange. The isolated, dispersed ions, which are often considered to be essential for adsorption and catalysis, were obtained with high yield only by ion exchange in the presence of ferrous oxalate. TPD/MS measurements show that aromatic hydrocarbons adsorb on specific, strong active sites in hydrated zeolites. The binding occurred when organic molecules replace water previously adsorbed at the same sites. Benzene showed non-dissociative adsorption/desorption, while new mass fragments were recorded during methyl-benzene and ethyl-benzene desorption implying their dissociative adsorption/desorption on active sites in hydrated zeolites.
PB - Springer, Dordrecht
T2 - Reaction Kinetics Mechanisms and Catalysis
T1 - The accessibility of sites active in the dissociative adsorption of aromatic hydrocarbons in FeZSM-5 zeolite
EP - 246
IS - 1
SP - 231
VL - 123
DO - 10.1007/s11144-017-1275-y
ER -
@article{
author = "Milojević-Rakić, M. and Dondur, Vera and Damjanović-Vasilić, Ljiljana and Rac, Vladislav and Rakić, Vesna",
year = "2018",
abstract = "The competitive adsorption of aromatic hydrocarbons (benzene, methyl- and ethyl-benzene) and water on FeZSM-5 zeolites have been investigated by means of temperature-programmed desorption coupled with mass spectrometry (TPD/MS). The incorporation of iron in zeolite was done by aqueous ion exchange using dilute solutions of Fe complexes (ferric citrate and ferrous oxalate) and ferric nitrate. Diffuse reflectance UV-Vis spectroscopy and temperature-programmed reduction (TPR) were applied to characterize active sites on investigated zeolites. The existence of different iron species on FeZSM-5 zeolites was revealed. It has been demonstrated that the activity of the Fe exchanged zeolite depends on the iron salt used for ion exchange. The isolated, dispersed ions, which are often considered to be essential for adsorption and catalysis, were obtained with high yield only by ion exchange in the presence of ferrous oxalate. TPD/MS measurements show that aromatic hydrocarbons adsorb on specific, strong active sites in hydrated zeolites. The binding occurred when organic molecules replace water previously adsorbed at the same sites. Benzene showed non-dissociative adsorption/desorption, while new mass fragments were recorded during methyl-benzene and ethyl-benzene desorption implying their dissociative adsorption/desorption on active sites in hydrated zeolites.",
publisher = "Springer, Dordrecht",
journal = "Reaction Kinetics Mechanisms and Catalysis",
title = "The accessibility of sites active in the dissociative adsorption of aromatic hydrocarbons in FeZSM-5 zeolite",
pages = "246-231",
number = "1",
volume = "123",
doi = "10.1007/s11144-017-1275-y"
}
Milojević-Rakić, M., Dondur, V., Damjanović-Vasilić, L., Rac, V.,& Rakić, V.. (2018). The accessibility of sites active in the dissociative adsorption of aromatic hydrocarbons in FeZSM-5 zeolite. in Reaction Kinetics Mechanisms and Catalysis
Springer, Dordrecht., 123(1), 231-246.
https://doi.org/10.1007/s11144-017-1275-y
Milojević-Rakić M, Dondur V, Damjanović-Vasilić L, Rac V, Rakić V. The accessibility of sites active in the dissociative adsorption of aromatic hydrocarbons in FeZSM-5 zeolite. in Reaction Kinetics Mechanisms and Catalysis. 2018;123(1):231-246.
doi:10.1007/s11144-017-1275-y .
Milojević-Rakić, M., Dondur, Vera, Damjanović-Vasilić, Ljiljana, Rac, Vladislav, Rakić, Vesna, "The accessibility of sites active in the dissociative adsorption of aromatic hydrocarbons in FeZSM-5 zeolite" in Reaction Kinetics Mechanisms and Catalysis, 123, no. 1 (2018):231-246,
https://doi.org/10.1007/s11144-017-1275-y . .
