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NH4F modified Al-SBA-15 materials for esterification of valeric acid to alkyl valerates.
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1  Departamento de Química Orgánica. Universidad de Córdoba (Spain)
2  Scientific Center for Molecular Design and Synthesis of Innovative Compounds for the Medical Industry, Peoples Friendship University of Russia (RUDN), Moscow, Russia

Published: 27 August 2018 by MDPI in 1st International Online Conference on Nanomaterials session Devices & Energy

In the present work, SBA-15 aluminosilicate materials were modified for their use as catalysts in the valeric acid esterification. Firstly, Al-SBA-15 material were functionalised by ball milling with several niobium loadings (0.25-1 wt.%) and, eventualy, by incipient wetness impregnation with several F- loadings, using ammonium fluoride as salt precursor. The catalyst herein synthesised were characterised by XRD, N2 porosimetry and DRIFT among others with a special emphasis to the acidic properties, which were evaluated by titration using pyridine and 2,6-dimethylpyridine. The prepared materials shown form moderate to high catalytic activities in the microwave-assisted transformation of valeric acid to ethyl valerate via esterification. Unexpectedly, the incorporation of niobic acid nanoparticles on the aluminosicates lead to a decrease in the conversion without finding any trend related with the metal loading. On the contrary, the incorporation of fluoride anions either on Al-SBA-15 or on Nb1%/Al-SBA-15 leads to a linear increase in valeric acid conversion with the F- content. The increase on valeric acid conversion has been the same independently if the modification with fluoride anions has been performed over Al-SBA-15 or Nb1%/Al-SBA-15. Thus, it can be concluded that F- modified mesoporous aluminosilicates are efficient catalyst for the transformation of valeric acid into alkyl valerate esters as renewable fuels.

Keywords: Heterogeneous catalysts; mesoporous materials; biomass valorisation; esterification; alkyl valerates
Comments on this paper
Violeta-Carolina Niculescu
Comment on the paper
Thank you for sharing this study. Maybe we can collaborate in the field of mesoporous silica materials. We are also a group involved in developing mesoporous materials for environment protection and/or life sciences.

Antonio Pineda
Thanks Violeta!
Thanks Violeta for your nice comment! We will be very happy to collaborate with you! Contact us using any of emails provided (