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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Post-synthesis incorporation of Al into germanosilicate ITH zeolites: The influence of treatment conditions on the acidic properties and catalytic behavior in tetrahydropyranylation
Original language description
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
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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