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Conversion of ethanol to acetaldehyde over VOX-SiO2 catalysts: the effects of support texture and vanadium speciation

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Abstract

SBA-15 and fumed-silica-supported vanadium catalysts prepared by impregnation to contain 1, 5 and 10 wt% of vanadia were characterized by XRF, N2-BET, SEM, H2-TPR, DR UV–vis and Raman spectroscopy to determine the key vanadium species present in these catalysts. These catalysts were then used in the oxidation of ethanol by oxygen at 250 and 300 °C. The comparison of the catalytic performances of individual catalysts with their physico-chemical characteristics led to the conclusion that oligomeric tetrahedrally coordinated vanadium species have the highest potential for the selective oxidation of ethanol reaching high intrinsic catalytic activity and high selectivity to acetaldehyde. They differ significantly from catalysts with a high population of monomeric species, which exhibit low activity, especially at 250 °C, and high selectivity to ethylene as a product of ethanol dehydration. The observed changes in the isothermal dependence of selectivity to ethene on the conversion degree were ascribed to the auto-inhibition effect of water vapor.

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Acknowledgements

Financial support of the Czech Science Foundation GA CR under the Project No. 15-19780S and OP VaVpI: CEMNAT CZ.1.05/4.1.00/11.0251 is highly acknowledged. In addition, we would like to thank Arnošt Zukal from JH INST Prague for synthesis of SBA-15 support and Veronika Podzemná from Center of Materials and Nanotechnology of University of Pardubice for SEM images. The project has been integrated into the National Programme for Sustainability I of the Ministry of Education, Youth and Sports of the Czech Republic through the project Development of the UniCRE Centre, Project code LO1606.

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  1. Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic

    P. Čičmanec, K. Raabová & R. Bulánek

  2. Unipetrol Centre for Research and Education UNICRE, Areál Chempark, 436 70, Záluží 1, Czech Republic

    J. M. Hidalgo

  3. Technopark Kralupy VŠCHT Praha (University of Chemistry and Technology Prague), Žižkova 7, 278 01, Kralupy nad Vltavou, Czech Republic

    David Kubička

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  1. P. Čičmanec
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Čičmanec, P., Raabová, K., Hidalgo, J.M. et al. Conversion of ethanol to acetaldehyde over VOX-SiO2 catalysts: the effects of support texture and vanadium speciation. Reac Kinet Mech Cat 121, 353–369 (2017). https://doi.org/10.1007/s11144-017-1169-z

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