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.
Previous Article in event Previous Article in session
Next Article in event
Synthesis and characterization of graphene oxide derivatives via functionalization reaction with hexamethylene diisocyanateNext Article in session
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
Keywords: Heterogeneous catalysts; mesoporous materials; biomass valorisation; esterification; alkyl valerates