Chemical Papers

, Volume 72, Issue 4, pp 937–946 | Cite as

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

  • Yadolah Ganjkhanlou
  • Zdeněk Tišler
  • José Miguel Hidalgo
  • Karel Frolich
  • Jiří Kotera
  • Pavel Čičmanec
  • Roman Bulánek
Original Paper
  • 47 Downloads

Abstract

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.

Keywords

Mesoporous Silica Oxidative dehydrogenation Ethanol Zirconia Acetaldehyde 

Notes

Acknowledgements

A financial support of the Czech Science Foundation GA CR under Project No. P106/15-19780S is highly acknowledged. In addition, we would like to thank Veronika Podzemná from Center of Materials and Nanotechnology of University of Pardubice for measurement of the SEM images.

Supplementary material

11696_2017_336_MOESM1_ESM.docx (393 kb)
Supplementary material 1 (DOCX 393 kb)

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2017

Authors and Affiliations

  1. 1.Department of Physical Chemistry, Faculty of Chemical TechnologyUniversity of PardubicePardubiceCzech Republic
  2. 2.Unipetrol Centre for Research and Education/UNICRELitvínovCzech Republic

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