The effect of vanadium content and speciation on the activity of VOx/ZrO2 catalysts in the conversion 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%3A39912588" target="_blank" >RIV/00216275:25310/18:39912588 - isvavai.cz</a>
Alternative codes found
RIV/62243136:_____/18:N0000084 RIV/62243136:_____/18:N0000074
Result on the web
<a href="http://dx.doi.org/10.1016/j.apcata.2018.07.040" target="_blank" >http://dx.doi.org/10.1016/j.apcata.2018.07.040</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.apcata.2018.07.040" target="_blank" >10.1016/j.apcata.2018.07.040</a>
Alternative languages
Result language
angličtina
Original language name
The effect of vanadium content and speciation on the activity of VOx/ZrO2 catalysts in the conversion of ethanol to acetaldehyde
Original language description
Catalytic conversion of ethanol to acetaldehyde under oxidizing conditions over VOx/ZrO2 catalysts with various surface VOx densities has been investigated. Vanadium complexes anchored on the surface of zirconia oxide support are characterized in detail and their catalytic properties reported. The catalysts were prepared by incipient wetness impregnation from a peroxidic solution of ammonium metavanadate. The texture and crystallinity of the catalysts were investigated by N-2 physisorption and XRD analysis. The speciation and redox properties of the vanadium complexes were studied by dispersive Raman spectroscopy and the temperature programmed reduction (TPR) method. The effects of vanadium species distribution and ZrO2 support crystallinity on the catalytic activity in the oxidative dehydrogenation of ethanol to acetaldehyde were analyzed and discussed in a broad context. A comparison of the catalytic results with details of the distribution of vanadium complexes has led to the conclusion that vanadium speciation has a great impact on catalytic behavior and that small oligomeric vanadium complexes dominate in the catalysts with vanadium content slightly above half of monolayer capacity, exhibiting the highest catalytic activity and very high selectivity to acetaldehyde (better than 93%). A comparison of the catalytic behavior of VOx supported on tetragonal and monoclinic ZrO2 phases has not revealed any differences in the activity or selectivity of the ethanol ODH reaction. Long-term catalytic experiments have shown good stability of the catalysts (stable conversion and selectivity for more than 600 h).
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
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)
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
Applied catalysis A: General
ISSN
0926-860X
e-ISSN
—
Volume of the periodical
564
Issue of the periodical within the volume
August
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
10
Pages from-to
208-217
UT code for WoS article
000443669800022
EID of the result in the Scopus database
2-s2.0-85050693855