Journal
MOLECULAR CATALYSIS
Volume 481, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mcat.2018.12.025
Keywords
Biomass; Biofuels; Fructose; 5-Hydroxymethyl-furfural (HMF); Pyrochlore
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Funding
- Comunidad de Madrid (Spain) [RESTOENE-2-CM S2013/MAE-2882]
- CSIC (Spain) [201880E029]
- Spanish MINEICO [MAT2017-84496-R]
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The pyrochlores (H3O)(x)SbxTe(2-x)O6 (x = 1, 1.1 and 1.25) obtained by ion exchange from KxSbxTe(2-x)O6 oxides were used as catalysts for the conversion of fructose to 5-hydroxymethylfurfural (HMF) in H2O/Methyl isobutyl ketone (MIBK). The structure of the resulting compounds as well as the location of the H3O+ units inside the three-dimensional network, were determined by XRD from powder samples. The effect of factors such as reaction time and temperature on the formation of HMF was studied. A fructose conversion of 99% and a yield of 59% were achieved after 120 min of reaction time and at 150 degrees C temperature. The percentage of substitution of the cations Sb and Te in the position B of the pyrochlore was determinant to achieve the maximum incorporation of H3O+ ions in the pyrochlore structure, which allowed to correlate the density of acidic sites present in the materials and their catalytic activity.
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