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Coordination of extraframework Li+ cation in the MCM-22 and MCM-36 zeolite: FTIR study of CO adsorbed
Authors: Bulánek Roman | Kolářová Monika | Chlubná Pavla | Čejka Jiří
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Adsorption - Journal of the International Adsorption Society
Publisher name: Springer
Place: Dordrecht
Page from-to: 455-463
Titles:
Language Name Abstract Keywords
cze Koordinace mimomřížkového Li+ kationtu v MCM-22 a MCM-36 zeolitech: FTIR studie adsorbovaného CO Povaha a populace Li+ kationtových poloh v MCM-22 a MCM-36 zeolitech byla zkoumána pomocí adsorpce CO molekul. CO vibrační frekvence a adsorpční teplo byly měřeny pomocí FTIR spektroskopie a adsorpční mikrokalorimetrie. Intra-zeolitické karbonylové komplexy na Li+ kationtech v MCM-22 a MCM-36 jsou charakterizovány pomocí dvou hlavních vibračních pásů při 2195 a 2188 cm(-1). FTIR; CO; adsorpční mikrokalorimetrie; MCM-22; MCM-36
eng Coordination of extraframework Li+ cation in the MCM-22 and MCM-36 zeolite: FTIR study of CO adsorbed 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. FTIR; CO; adsorption microcalorimetry; MCM-22; MCM-36

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