Microcalorimetric and FTIR Study of the Adsorption of Carbon Dioxide on Alkali-Metal Exchanged FER Zeolites

Adsorption of CO 2 on alkali-metal exchanged (Li + , Na + , K + ) FER zeolites was investigated by means of microcalorimetry and FTIR spectroscopy. The adsorption enthalpies strongly depend on coverage for all investigated materials and they are also influenced by concentration of Al in the framewor...

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Bibliographic Details
Published in:Topics in catalysis 2010-12, Vol.53 (19-20), p.1349-1360
Main Authors: Bulánek, Roman, Frolich, Karel, Frýdová, Eva, Čičmanec, Pavel
Format: Article
Language:English
Subjects:
Catalysis
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Industrial Chemistry/Chemical Engineering
Original Paper
Pharmacy
Physical Chemistry
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Summary:Adsorption of CO 2 on alkali-metal exchanged (Li + , Na + , K + ) FER zeolites was investigated by means of microcalorimetry and FTIR spectroscopy. The adsorption enthalpies strongly depend on coverage for all investigated materials and they are also influenced by concentration of Al in the framework. Especially, samples of Na- and K-FER with lower Si/Al ratio (8.6) exhibited substantially larger initial interaction energy than samples with Si/Al 27.5. Differences in zero-coverage adsorption energy of zeolites with different cation concentration (Si/Al ratio) are 9 and 7.2 kJ/mol for Na- and K-FER zeolites respectively. This phenomenon is attributed to formation of bridged CO 2 adsorption complexes formed between two cations, which are characterized by IR absorption band of ν 3 stretching vibration mode at 2370 and 2357 cm −1 for Na- and K-FER respectively.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-010-9593-6