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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F12%3A00379329%21RIV13-GA0-61388955
rdf:type
n5:Vysledek skos:Concept
dcterms:description
Sodium and potassium forms of STI zeolite synthesized with Si/Al ratios 15, 25, and 35 were characterized using X-ray powder diffraction and nitrogen adsorption at 77 K. To obtain detailed information on the effect of alkali metal cations on CO2 adsorption, the temperature dependence of CO2 isotherms was investigated in the temperature range from 273 to 333 K. Based on these data, isosteric heats of adsorption of CO2 were determined. It was found that the isosteric heat of CO2 adsorption attains the highest values on the sodium form of STI zeolite with a Si/Al ratio of 15. The lowest values were found with both sodium and potassium forms of STI zeolite having a Si/Al ratio of 35. Heats of adsorption of CO2 obtained for STI zeolites were discussed in detail and compared with those of FER, MFI, MEL, TUN, and IMF structural types. This comparison revealed that isosteric heats of adsorption of CO2 on STI zeolites are lower by approximately 8 kJ mol1 compared with heats of adsorption for FER, MFI, MEL, TUN, and IMF zeolites composed of the eight- or/and ten-ring channel systems as well as STI zeolites. This effect was explained on the basis of stronger interaction of alkali metal cations with oxygen atoms of the zeolitic framework. Sodium and potassium forms of STI zeolite synthesized with Si/Al ratios 15, 25, and 35 were characterized using X-ray powder diffraction and nitrogen adsorption at 77 K. To obtain detailed information on the effect of alkali metal cations on CO2 adsorption, the temperature dependence of CO2 isotherms was investigated in the temperature range from 273 to 333 K. Based on these data, isosteric heats of adsorption of CO2 were determined. It was found that the isosteric heat of CO2 adsorption attains the highest values on the sodium form of STI zeolite with a Si/Al ratio of 15. The lowest values were found with both sodium and potassium forms of STI zeolite having a Si/Al ratio of 35. Heats of adsorption of CO2 obtained for STI zeolites were discussed in detail and compared with those of FER, MFI, MEL, TUN, and IMF structural types. This comparison revealed that isosteric heats of adsorption of CO2 on STI zeolites are lower by approximately 8 kJ mol1 compared with heats of adsorption for FER, MFI, MEL, TUN, and IMF zeolites composed of the eight- or/and ten-ring channel systems as well as STI zeolites. This effect was explained on the basis of stronger interaction of alkali metal cations with oxygen atoms of the zeolitic framework.
dcterms:title
Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite
skos:prefLabel
Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite Adsorption of Carbon Dioxide on Sodium and Potassium Forms of STI Zeolite
skos:notation
RIV/61388955:_____/12:00379329!RIV13-GA0-61388955
n5:predkladatel
n6:ico%3A61388955
n3:aktivita
n11:I n11:P
n3:aktivity
I, P(GA203/08/0604)
n3:cisloPeriodika
8
n3:dodaniDat
n13:2013
n3:domaciTvurceVysledku
n14:7350678 n14:7016662 n14:5283396
n3:druhVysledku
n10:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n18:predkladatel
n3:idSjednocenehoVysledku
121149
n3:idVysledku
RIV/61388955:_____/12:00379329
n3:jazykVysledku
n7:eng
n3:klicovaSlova
adsorption; carbon dioxide; zeolites
n3:klicoveSlovo
n12:zeolites n12:adsorption n12:carbon%20dioxide
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[F2E3C959D255]
n3:nazevZdroje
ChemPlusChem
n3:obor
n16:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n19:GA203%2F08%2F0604
n3:rokUplatneniVysledku
n13:2012
n3:svazekPeriodika
77
n3:tvurceVysledku
Zukal, Arnošt Kubů, Martin Čejka, Jiří Zones, S. I. Davis, T. M.
n3:wos
000307401800008
s:issn
2192-6506
s:numberOfPages
7
n15:doi
10.1002/cplu.201200089