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.
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NH4F modified Al-SBA-15 materials for esterification of valeric acid to alkyl valerates.
Published:
27 August 2018
by MDPI
in 1st International Online Conference on Nanomaterials
session Devices & Energy
Abstract:
Keywords: Heterogeneous catalysts; mesoporous materials; biomass valorisation; esterification; alkyl valerates
Comments on this paper
Violeta-Carolina Niculescu
14 September 2018
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
14 September 2018
Thanks Violeta!
Thanks Violeta for your nice comment! We will be very happy to collaborate with you! Contact us using any of emails provided (q82pipia@uco.es)