Post-synthesis incorporation of Al into germanosilicate ITH zeolites: The influence of treatment conditions on the acidic properties and catalytic behavior in tetrahydropyranylation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F15%3A00446840" target="_blank" >RIV/61388955:_____/15:00446840 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1039/c4cy01594k" target="_blank" >http://dx.doi.org/10.1039/c4cy01594k</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c4cy01594k" target="_blank" >10.1039/c4cy01594k</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Post-synthesis incorporation of Al into germanosilicate ITH zeolites: The influence of treatment conditions on the acidic properties and catalytic behavior in tetrahydropyranylation

Popis výsledku v původním jazyce

Post-synthesis alumination of germanosilicate medium-pore ITH zeolites was shown to be an effective procedure for tuning their acidity. Treatment of ITH zeolites synthesized with different chemical compositions (i.e. Si/Ge = 2.5, 4.4 and 5.8) with aqueous Al(NO3)3 solution led to the formation of strong Br?nsted and Lewis acid sites and an increasing fraction of ultramicro- and meso-pores in Ge-rich ITH samples (Si/Ge = 2.5 and 4.4). The concentration of Al incorporated into the framework increases withdecreasing Si/Ge ratio of the parent ITH. The increasing temperature of alumination from 80 to 175 °C (HT conditions) resulted in (1) a 1.5-2-fold increase in the concentration of Br?nsted acid sites formed and (2) a decreasing fraction of framework Alatoms detectable with base probe molecules (i.e. pyridine, 2,6-di-tert-butylpyridine), i.e. an increased concentration of the "inner" acid sites. The activity of prepared Al-substituted ITH zeolites in tetrahydropyranylation of alcohols i

Název v anglickém jazyce

Post-synthesis incorporation of Al into germanosilicate ITH zeolites: The influence of treatment conditions on the acidic properties and catalytic behavior in tetrahydropyranylation

Popis výsledku anglicky

Post-synthesis alumination of germanosilicate medium-pore ITH zeolites was shown to be an effective procedure for tuning their acidity. Treatment of ITH zeolites synthesized with different chemical compositions (i.e. Si/Ge = 2.5, 4.4 and 5.8) with aqueous Al(NO3)3 solution led to the formation of strong Br?nsted and Lewis acid sites and an increasing fraction of ultramicro- and meso-pores in Ge-rich ITH samples (Si/Ge = 2.5 and 4.4). The concentration of Al incorporated into the framework increases withdecreasing Si/Ge ratio of the parent ITH. The increasing temperature of alumination from 80 to 175 °C (HT conditions) resulted in (1) a 1.5-2-fold increase in the concentration of Br?nsted acid sites formed and (2) a decreasing fraction of framework Alatoms detectable with base probe molecules (i.e. pyridine, 2,6-di-tert-butylpyridine), i.e. an increased concentration of the "inner" acid sites. The activity of prepared Al-substituted ITH zeolites in tetrahydropyranylation of alcohols i

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

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

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Catalysis Science &Technology

ISSN

2044-4753

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

2973-2984

Kód UT WoS článku

000353641800047

EID výsledku v databázi Scopus

2-s2.0-84928911288