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Adsorption

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01.04.2013

Coordination of extraframework Li⁺ cation in the MCM-22 and MCM-36 zeolite: FTIR study of CO adsorbed

verfasst von: Roman Bulánek, Monika Kolářová, Pavla Chlubná, Jiří Čejka

Erschienen in: Adsorption | Ausgabe 2-4/2013

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Abstract

Nature and population of Li⁺ cationic sites in MCM-22 zeolite and its pillared form (MCM-36) were investigated by means of adsorption of CO as a probe molecule. CO stretching frequency and adsorption heat were measured by FTIR spectroscopy and adsorption microcalorimetry. Intrazeolitic carbonyl complexes on Li⁺ cations in MCM-22 and MCM-36 are characterized by two main vibrational bands at 2,195 and 2,188 cm⁻¹. Band at higher wavenumbers is ascribed to carbonyls on Li⁺ ions coordinated only to two oxygen atoms at the intersection of 10-ring channels and interacting with CO molecule by energy around 45 kJ mol⁻¹. Band at 2,188 cm⁻¹ was assigned to the carbonyls on Li⁺ cations located on top of 5 or 6-rings on the channel walls and coordinated to three or four oxygen atoms, interacting with CO molecule by energy 33–36 kJ mol⁻¹. Effect of pillaring and layered form of zeolite on nature and population of Li⁺ cationic sites is also discussed, as well as the formation of dicarbonyl complexes.

Vorheriger Artikel Adsorption of Triton X-100 and cetyltrimethylammonium bromide mixture with ethanol at nylon-6–solution interface with regard to nylon-6 wettability: II. Work of adhesion and activity of surfactants at interfaces

Nächster Artikel Magnetite nanoparticles for removal of heavy metals from aqueous solutions: synthesis and characterization

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Titel: Coordination of extraframework Li+ cation in the MCM-22 and MCM-36 zeolite: FTIR study of CO adsorbed
verfasst von: Roman Bulánek
Monika Kolářová
Pavla Chlubná
Jiří Čejka
Publikationsdatum: 01.04.2013
Verlag: Springer US
Erschienen in: Adsorption / Ausgabe 2-4/2013
Print ISSN: 0929-5607
Elektronische ISSN: 1572-8757
DOI: https://doi.org/10.1007/s10450-012-9467-2

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