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Statements

Subject Item
n2:RIV%2F00216275%3A25310%2F13%3A39896434%21RIV14-GA0-25310___
rdf:type
n4:Vysledek skos:Concept
rdfs:seeAlso
http://www.sciencedirect.com/science/article/pii/S1387181112006567
dcterms: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 lower the 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 carbonyls. IR stabilities are well correlated with CO heats of adsorption and changes on calorimetric curves justifying the kinetic evaluation. The influence of zeolite composition, namely Cu loading and kind of co-cation, on the character of IR spectrum and population of energetic components is discussed. 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 lower the 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 carbonyls. IR stabilities are well correlated with CO heats of adsorption and changes on calorimetric curves justifying the kinetic evaluation. The influence of zeolite composition, namely Cu loading and kind of co-cation, on the character of IR spectrum and population of energetic components is discussed.
dcterms:title
Energetic heterogeneity of Cu+-carbonyl complexes in Y zeolites: Kinetics of CO desorption studied by FTIR combined with CO adsorption microcalorimetry Energetic heterogeneity of Cu+-carbonyl complexes in Y zeolites: Kinetics of CO desorption studied by FTIR combined with CO adsorption microcalorimetry
skos:prefLabel
Energetic heterogeneity of Cu+-carbonyl complexes in Y zeolites: Kinetics of CO desorption studied by FTIR combined with CO adsorption microcalorimetry Energetic heterogeneity of Cu+-carbonyl complexes in Y zeolites: Kinetics of CO desorption studied by FTIR combined with CO adsorption microcalorimetry
skos:notation
RIV/00216275:25310/13:39896434!RIV14-GA0-25310___
n4:predkladatel
n5:orjk%3A25310
n3:aktivita
n17:P n17:I
n3:aktivity
I, P(GPP208/11/P276)
n3:cisloPeriodika
N
n3:dodaniDat
n12:2014
n3:domaciTvurceVysledku
n6:9333312 n6:1364332 n6:7420900
n3:druhVysledku
n18:J
n3:duvernostUdaju
n20:S
n3:entitaPredkladatele
n10:predkladatel
n3:idSjednocenehoVysledku
72818
n3:idVysledku
RIV/00216275:25310/13:39896434
n3:jazykVysledku
n11:eng
n3:klicovaSlova
desorption kinetics; carbonyl stability; copper faujasite; microcalorimetry; FTIR
n3:klicoveSlovo
n7:carbonyl%20stability n7:microcalorimetry n7:copper%20faujasite n7:FTIR n7:desorption%20kinetics
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[90E15EB4018D]
n3:nazevZdroje
Microporous and Mesoporous Materials
n3:obor
n21:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:projekt
n14:GPP208%2F11%2FP276
n3:rokUplatneniVysledku
n12:2013
n3:svazekPeriodika
171
n3:tvurceVysledku
Frolich, Karel Frýdová, Eva Bulánek, Roman
n3:wos
000316437800025
s:issn
1387-1811
s:numberOfPages
11
n8:doi
10.1016/j.micromeso.2012.11.007
n9:organizacniJednotka
25310