Adsorption of CO2 on Sodium-Exchanged Ferrierites: The Bridged CO2 Complexes Formed between Two Extraframework Cations

Isosteric heats of adsorption of CO2 on sodium-exchanged ferrierites (Na−FER) with different Si/Al ratios were obtained from the adsorption isotherms recorded in the temperature range between 273 and 333 K. The isosteric heats of adsorption significantly depend on the content of the Na+ cation in th...

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Published in:Journal of physical chemistry. C 2009-02, Vol.113 (7), p.2928-2935
Main Authors: Pulido, Angeles, Nachtigall, Petr, Zukal, Arnošt, Domínguez, Irene, Čejka, Jiří
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Language:eng ; jpn
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C: Surfaces, Interfaces, Catalysis
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container_issue 7
container_start_page 2928
container_title Journal of physical chemistry. C
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creator Pulido, Angeles
Nachtigall, Petr
Zukal, Arnošt
Domínguez, Irene
Čejka, Jiří
description Isosteric heats of adsorption of CO2 on sodium-exchanged ferrierites (Na−FER) with different Si/Al ratios were obtained from the adsorption isotherms recorded in the temperature range between 273 and 333 K. The isosteric heats of adsorption significantly depend on the content of the Na+ cation in the zeolite. Large isosteric heats of adsorption were obtained for Na−FER when Si/Al = 8.7. On the basis of calculations employing the periodic density functional theory (DFT) model, these large isosteric heats are attributed to the formation of the linearly bridged CO2 adsorption complexes formed between a pair of Na+ cations located in cationic positions. The CO2 adsorption complexes formed on such dual-cation sites are ca. 10 kJ/mol more stable than the CO2 adsorption complexes where CO2 interacts only with a single Na cation.
doi_str_mv 10.1021/jp810038b
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title Adsorption of CO2 on Sodium-Exchanged Ferrierites: The Bridged CO2 Complexes Formed between Two Extraframework Cations
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