Non-hydrolytic sol-gel route to a family of hybrid mesoporous aluminosilicate ethanol dehydration catalysts

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F21%3A00119565" target="_blank" >RIV/00216224:14310/21:00119565 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s10853-021-06166-9" target="_blank" >https://link.springer.com/article/10.1007/s10853-021-06166-9</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10853-021-06166-9" target="_blank" >10.1007/s10853-021-06166-9</a>

Result language

angličtina

Original language name

Non-hydrolytic sol-gel route to a family of hybrid mesoporous aluminosilicate ethanol dehydration catalysts

Original language description

Hybrid materials are intensely studied for potential applications in heterogeneous catalysis. Organic groups at the catalyst surface can modify not only its hydrophilicity, but also acidity, hydrothermal stability, porosity, etc. In some cases, tuning such properties leads to improved catalytic performance. Often, however, the organic moieties are limited to methyl groups introduced via post-grafting. Here, a series of mesoporous hybrid aluminosilicate materials was prepared in one pot by non-hydrolytic sol-gel (NHSG). Aromatic, aliphatic, pendant, and bridging organic groups were incorporated. The presence of the organic groups in the bulk and at the outermost surface of the materials was verified by solid-state NMR, IR, ToF-SIMS, and XPS. The hybrid aluminosilicates were tested as catalysts in the gas phase ethanol dehydration to ethylene, and most of them outperformed the inorganic catalyst benchmark. While a direct influence of surface hydrophobicity (as probed by water sorption and water contact angle measurements) appeared unlikely, characterization of acidity (IR-pyridine) revealed that the improved performance for hybrid catalysts could be correlated with a modification of the acidic properties. The latter are determined by the quality of the dispersion of Al centers in the form of isolated sites in the hybrid silica matrix, which itself appears to be influenced by the presence of organic groups in the non-aqueous synthesis. All in all, this study establishes a "ranking" for a variety of organic groups in terms of their influence on the catalyst activity.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10402 - Inorganic and nuclear chemistry

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

Journal of Materials Science

ISSN

0022-2461

e-ISSN

1573-4803

Volume of the periodical

56

Issue of the periodical within the volume

25

Country of publishing house

US - UNITED STATES

Number of pages

18

Pages from-to

14001-14018

UT code for WoS article

000656384200004

EID of the result in the Scopus database

2-s2.0-85107308961