VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GA15-19780S" target="_blank" >GA15-19780S: Studium aktivních center nosičových vanadových katalyzátorů pro selektivní oxidaci etanolu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Chemical Papers

ISSN

0366-6352

e-ISSN

—

Svazek periodika

72

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

10

Strana od-do

937-946

Kód UT WoS článku

000428254500017

EID výsledku v databázi Scopus

2-s2.0-85044272545