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Vibration properties of CO species in Li+ and Cu+ ion-exchanged MCM-41.
Authors: Drobná Helena | Bulánek Roman | Nachtigall Petr
Year: 2006
Type of publication: článek ve sborníku
Name of source: The XXIX Annual British Zeolite Association Conference, Book of Abstracts
Publisher name: British Zeolite Association
Place: Ambleside, England
Page from-to: 12-12
Titles:
Language Name Abstract Keywords
cze Vibrační vlastnosti CO částic na Li+ a Cu+ vyměněných do MCM-41. Vibrační vlastnosti karbonylových částic na Li+ a Cu+ iontech lokalizovaných v MCM-41 struktuře byly studovány pomocí IČ spektroskopie za pokojové teploty a 100 K. Li-CO komplexy vykazovaly jeden asymetrický pás na 2188 cm-1 stejne jako karbonyly lithia v zeolitech. Naopak karbonyly na Cu+ iontech se výrazně liší od karbonylů v zeolitech. Ve spektrech lze rozlišit dva vibrační pásy na 2158 a 2145 cm-1. Vzhledem k těmto výsledkům jsme navrhly modelovou představu stěny mesoporézního kanálu MCM-41 struktury, která podle nás není hladká, ale musí být prolamovaná. CO, karbonyl, IČ, MCM-41, mesoporézní kanál, prolamovaná stěna kanálu
eng Vibration properties of CO species in Li+ and Cu+ ion-exchanged MCM-41. Vibration properties of carbonyl species on Li+ and Cu+ exchanged MCM-41 (Si/Al molar ratio is about 50) at room temperature (RT) and at 100 K were investigated by FTIR spectroscopy. One asymmetric absorption band with maximum at around 2188 cm-1 assigned to monocarbonyl Li+-CO species was detected in the spectra both at RT and 100 K. Broad asymmetric absorption band is detected in FTIR spectra of CO adsorption on Cu+-MCM-41 at RT. It can be deconvoluted in two individual peaks with maximum at 2158 and 2145 cm-1. Due to a large pore diameter in MCM-41 the interaction of CO with opposite wall cannot take place and, therefore, we suggest that the structure of the channel walls in MCM-41 cannot be smooth, instead it is rather corrugated. CO, carbonyl, IR, MCM-41, mesoporous channel, corrugated channel wall

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