Počet záznamů: 1
Experimental and theoretical determination of adsorption heats of CO2 over alkali metal exchanged ferrierites with different Si/Al ratio
0343891 - UFCH-W 2011 RIV GB eng J - Článek v odborném periodiku
Zukal, Arnošt - Pulido, A. - Gil, B. - Nachtigall, P. - Bludský, Ota - Rubeš, M. - Čejka, Jiří
Experimental and theoretical determination of adsorption heats of CO2 over alkali metal exchanged ferrierites with different Si/Al ratio.
Physical Chemistry Chemical Physics. Roč. 12, č. 24 (2010), s. 6413-6422 ISSN 1463-9076
Grant CEP: GA ČR GA203/09/0143; GA MŠk LC512; GA ČR GA203/08/0604
Výzkumný záměr: CEZ:AV0Z40400503; CEZ:AV0Z40550506
Klíčová slova: adsorption * CO2 * FTIR spectroscopy
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 3.454, rok: 2010
The adsorption of CO2 in Li-, Na-, and K-FER was investigated by a combination of volumetric adsorption experiments, FTIR spectroscopy, and density functional theory. Experimental isosteric heats of CO2, Qst, depend significantly on the cation size, cation concentration, and on the amount of adsorbed CO2. The differences observed in experimentally determined isosteric heats were interpreted at the molecular level based on good agreement between experimental and calculated characteristics. The highest interaction energies were found for CO2 adsorbed on so-called dual cation sites in which CO2 is bridged between two alkali metal cations. The formation of CO2 adsorption complexes on dual cation sites is particularly important on Na-FER and K-FER samples with higher cation concentration. On the contrary, the differences in Qst observed for Li-FER samples are due to the changes in the Li+ coordination with the framework.
Trvalý link: http://hdl.handle.net/11104/0186264