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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GPP208%2F11%2FP276" target="_blank" >GPP208/11/P276: Metodika přípravy Cu zeolitických systémů - studie distribuce mědí pomocí nepřímých experimentálních technik využívajících testovací molekuly</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Microporous and Mesoporous Materials

ISSN

1387-1811

e-ISSN

—

Svazek periodika

171

Číslo periodika v rámci svazku

N

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

185-195

Kód UT WoS článku

000316437800025

EID výsledku v databázi Scopus

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