Structure of Al-Lewis Site in Beta Zeolite Active in Meerwein-Ponndorf-Verley Reduction of Ketone to Alcohol.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F02%3A54020175" target="_blank" >RIV/61388955:_____/02:54020175 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Structure of Al-Lewis Site in Beta Zeolite Active in Meerwein-Ponndorf-Verley Reduction of Ketone to Alcohol.

Popis výsledku v původním jazyce

H-beta zeolites differing in removal of the template by calcination in an oxygen or in a stream of ammonia, and in their subsequent steam treatment at various temperatures, as well as beta zeolites exchanged with alkaline metal ions, were investigated inthe MPV reduction of 4-tert-butyl cyclohexanone to 4-tert-butyl hexanol using isopropanol. FTIR of the OH groups, of the C=N groups of adsorbed d(3)-acetonitrile, and of the framework T-O-T antisymmetric mode was used to estimate the concentration of the individual Al-Lewis sites. XPS was employed to monitor the migration of the Al species into the surface layers of the zeolite crystals. The VHF band at 3780 cm(-1) and skeletal T-O-T bands at 901, 890, and 882 cm-1 were found for steam-treated (ST) H-beta. Both alkali metal ion exchange and treatment of zeolite by gaseous ammonia annihilated the bands at 3780 and 882 cm-1, but the bands at 901 and 890 cm-1 (siloxane bridges) were retained. While the bands at 3780 and 882 cm-1.

Název v anglickém jazyce

Structure of Al-Lewis Site in Beta Zeolite Active in Meerwein-Ponndorf-Verley Reduction of Ketone to Alcohol.

Popis výsledku anglicky

H-beta zeolites differing in removal of the template by calcination in an oxygen or in a stream of ammonia, and in their subsequent steam treatment at various temperatures, as well as beta zeolites exchanged with alkaline metal ions, were investigated inthe MPV reduction of 4-tert-butyl cyclohexanone to 4-tert-butyl hexanol using isopropanol. FTIR of the OH groups, of the C=N groups of adsorbed d(3)-acetonitrile, and of the framework T-O-T antisymmetric mode was used to estimate the concentration of the individual Al-Lewis sites. XPS was employed to monitor the migration of the Al species into the surface layers of the zeolite crystals. The VHF band at 3780 cm(-1) and skeletal T-O-T bands at 901, 890, and 882 cm-1 were found for steam-treated (ST) H-beta. Both alkali metal ion exchange and treatment of zeolite by gaseous ammonia annihilated the bands at 3780 and 882 cm-1, but the bands at 901 and 890 cm-1 (siloxane bridges) were retained. While the bands at 3780 and 882 cm-1.

Druh

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

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

—

Projekt

<a href="/cs/project/IBS4040015" target="_blank" >IBS4040015: Syntéza molekulových sít pro transformace uhlovodíků</a><br>

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

210

Číslo periodika v rámci svazku

N/A

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

171-182

Kód UT WoS článku

—

EID výsledku v databázi Scopus

—