Siting and Distribution of the Co Ions in Beta Zeolite: A UV-Vis-NIR and FTIR Study.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F02%3A54020094" target="_blank" >RIV/61388955:_____/02:54020094 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Siting and Distribution of the Co Ions in Beta Zeolite: A UV-Vis-NIR and FTIR Study.

Popis výsledku v původním jazyce

The Co(II) ion sites in dehydrated Beta zeolites, consisting of polymorphs A, B and C, were identified using an approach based on a similarity between Vis spectra of the Co(II) ions in mordenite, ferrierite ZSM-5 and beta zeolites, and similarity in local framework structures accommodating the Co(II) ions in these zeolites. The results were supported by FTIR spectra in the region of skeletal vibrations showing the characteristic shifts of framework T-O-T vibrations induced by the framework perturbationsdue to the Co(II) ions at cationic sites. Three different cationic sites accommodating divalent metal ions in Beta zeolite were found. Their positions in the channel system and local framework arrangements in different polymorphs of Beta zeolites were suggested. The .alfa. site is formed in polymorph C of the Beta structure by an elongated six-member ring composed of two folded connected five-member rings. The Co(II) ions at the .alfa. site exhibit an absorption band.

Název v anglickém jazyce

Siting and Distribution of the Co Ions in Beta Zeolite: A UV-Vis-NIR and FTIR Study.

Popis výsledku anglicky

The Co(II) ion sites in dehydrated Beta zeolites, consisting of polymorphs A, B and C, were identified using an approach based on a similarity between Vis spectra of the Co(II) ions in mordenite, ferrierite ZSM-5 and beta zeolites, and similarity in local framework structures accommodating the Co(II) ions in these zeolites. The results were supported by FTIR spectra in the region of skeletal vibrations showing the characteristic shifts of framework T-O-T vibrations induced by the framework perturbationsdue to the Co(II) ions at cationic sites. Three different cationic sites accommodating divalent metal ions in Beta zeolite were found. Their positions in the channel system and local framework arrangements in different polymorphs of Beta zeolites were suggested. The .alfa. site is formed in polymorph C of the Beta structure by an elongated six-member ring composed of two folded connected five-member rings. The Co(II) ions at the .alfa. site exhibit an absorption band.

Druh

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

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2002

Kód důvěrnosti údajů

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

Název periodika

Journal of Catalysis

ISSN

0021-9517

e-ISSN

—

Svazek periodika

211

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

198-207

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—