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Quantitative analysis of IR spectra of carbonylic species in alkali-metal exchanged ZSM-5 and FER zeolites
Year: 2015
Type of publication: článek v odborném periodiku
Name of source: Catalysis Today
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 62-68
Titles:
Language Name Abstract Keywords
cze Kvantitativní analýza IR spekter karbonylových skupin v iontově vyměněných zeolitech ZSM-5 a FER Analýzou IR spekter byly získány absorpční koeficienty IR pásů přiřazených různým druhům karbonylových skupin: monokarbonylů na izolovaných kationtech, můstkových karbonylů interagujích se dvěmi blízkými kationty a isokarbonylů tvořených na draselných a sodíkových iontech v zeolitech ZSM-5 a FER. CO; alkalický kov; zeolity; IR spektra
eng Quantitative analysis of IR spectra of carbonylic species in alkali-metal exchanged ZSM-5 and FER zeolites The molar absorption coefficients of IR bands previously assigned to monocarbonyls on isolated cations, bridged carbonyls interacting with two nearby cations and isocarbonyls formed on potassium and sodium cations in the FER and ZSM-5 zeolites were determined by analyzing data obtained under specific adsorption conditions by using IR spectroscopy coupled with volumetry. In accordance with the prediction of the electrostatic model of CO interaction with potassium and sodium cations, molar absorption coefficient of isocarbonyl species is higher than molar absorption coefficient of C-down monocarbonyl complex. Behavior of bridged carbonyl complexes does not obey general rule according to which, for localized vibrations, the band intensity increases as their frequency decreases. Calculated molar absorption coefficients of given type of carbonyl complex in different zeolite structures are not the same and cannot be generalized. Thanks to these results, the quantity of different surface carbonyl species was estimated. Especially, amounts of bridged carbonyl complexes in FER and ZSM-5 zeolites were determined for the first time. carbonyl; alkali-metal; zeolites; IR spectra

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