Energetic heterogeneity of Cu+-carbonyl complexes in Y zeolites: Kinetics of CO desorption studied by FTIR combined with CO adsorption microcalorimetry

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F13%3A39896434" target="_blank" >RIV/00216275:25310/13:39896434 - isvavai.cz</a>
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S1387181112006567" target="_blank" >http://www.sciencedirect.com/science/article/pii/S1387181112006567</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.micromeso.2012.11.007" target="_blank" >10.1016/j.micromeso.2012.11.007</a>

Result language
angličtina
Original language name
Energetic heterogeneity of Cu+-carbonyl complexes in Y zeolites: Kinetics of CO desorption studied by FTIR combined with CO adsorption microcalorimetry
Original language description
We analyzed IR spectra of the isothermal (RT) time-dependent CO desorption on Cu+Me+H+-Y zeolites (Me = Li, Na, K) in order to investigate the energetic heterogeneity of Cu+-CO species. After spectrum deconvolution, integral band area is plotted as a function of time and fitted by several kinetic models. The combination of three first-order kinetic processes has to be used for accurate description of CO desorption process for all tested IR bands. Under the band, carbonyl complexes are substantially differing in desorption rate contribution. The energy gap of complexes with similar geometry is ascribed to variable original Cu siting. Cu moves toward faujasite supercage where the adsorption proceeds: the higher the Cu interaction with framework the lowerthe stability of corresponding carbonyl complex. Stability of carbonyl IR band decreases with wavenumber. Lower frequency bands, due to Cu at II sites with 2 (or 3) Al at 6T ring, are characterized by significant population of low-stable
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Project
<a href="/en/project/GPP208%2F11%2FP276" target="_blank" >GPP208/11/P276: Methodology of Cu-zeolitic systems preparation - the study of copper ions distribution using indirect experimental techniques and probe molecules</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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