VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216275%3A25310%2F18%3A39912574" target="_blank" >RIV/00216275:25310/18:39912574 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1007/s11696-017-0336-z" target="_blank" >http://dx.doi.org/10.1007/s11696-017-0336-z</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s11696-017-0336-z" target="_blank" >10.1007/s11696-017-0336-z</a>
Alternative languages
Result language
angličtina
Original language name
VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde
Original language description
Effect of zirconium presence in the silica framework and content and speciation of vanadium surface oxo-complexes on the catalytic behavior of VOx/Zr-SBA-15 catalysts in oxidative dehydrogenation of ethanol was investigated. Experimental results bring evidence of successful incorporation of zirconium into ordered mesoporous silica framework with the preservation of ordered mesoporosity by hydrothermal template base synthesis method. The presence of zirconium in the SBA-15 framework increases reducibility of vanadium species and acidity of the catalysts. It is reflected in higher activity of vanadium species expressed as turn-over frequency (e.g., TOF of 20 h(-1) for 5%VOx/Zr-SBA-15 sample in comparison with TOF of 12 h(-1) for 5%VOx/SBA-15 sample) and also in significant decrease of selectivity to acetaldehyde (65% in comparison with 90% for mentioned samples) followed by increase in selectivity to ethylene (25% in comparison with 5%). This change in distribution of reaction products is related to stronger acidity character of surface OH groups and inhibition effect of formed water vapours on the oxidative dehydrogenation products (acetaldehyde). Catalytic data also reveal that oligomeric/polymeric tetrahedrally coordinated vanadium species exhibit higher activity in ethanol oxidative dehydrogenation than monomeric complexes. In addition, comparison of the catalytic performance of VOx/Zr-SBA-15 catalysts with VOx/SBA-15 catalysts showed that catalytic properties of VOx/Zr-SBA-15 catalysts can be tuned by incorporation of controlled amount of zirconium into silica framework.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GA15-19780S" target="_blank" >GA15-19780S: The investigation of the active sites in supported vanadia catalysts for the selective oxidation of ethanol</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Chemical Papers
ISSN
0366-6352
e-ISSN
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Volume of the periodical
72
Issue of the periodical within the volume
4
Country of publishing house
DE - GERMANY
Number of pages
10
Pages from-to
937-946
UT code for WoS article
000428254500017
EID of the result in the Scopus database
2-s2.0-85044272545