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VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde
Authors: Ganjkhanlou Yadolah | Tišler Zdeněk | Hidalgo Jose Miguel | Frolich Karel | Kotera Jiří | Čičmanec Pavel | Bulánek Roman
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Chemical Papers
Publisher name: Springer
Place: Heidelberg
Page from-to: 937-946
Titles:
Language Name Abstract Keywords
cze VOx/Zr-SBA-15 katalyzátory pro selektivní oxidaci etanolu na acetaldehyd V tomto příspěvku byl zkoumán vliv Zr na strukturu, obsah a typ V-povrch oxo-komplexů a na katalytické chování Vox/Zr-SBA-15 katalyzátorů při oxidativní dehydrogenaci etanolu. Experimentální výsledky přinesly potvrzení úspěšného včlenění Zr do mezoporézní matrice. mezoporézní silika; oxidativní dehydrogenace; etanol; Zr; acetaldehyd
eng VOx/Zr-SBA-15 catalysts for selective oxidation of ethanol to acetaldehyde 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. Mesoporous Silica; Oxidative dehydrogenation; Ethanol; Zirconia; Acetaldehyde

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