Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts
Different solid sulfonic titania-based catalysts were investigated for the hydrothermal dehydration of fructose to 5-hydroxymethylfurfural (5-HMF). The catalytic behavior of the materials was evaluated in terms of fructose conversion and selectivity to 5-HMF. The surface and structural properties of...
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doaj-0f5eda87fac04240a05d838809a7596f2020-11-25T02:02:00ZengMDPI AGMaterials1996-19442020-03-01135117810.3390/ma13051178ma13051178Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> CatalystsMaria Luisa Testa0Gianmarco Miroddi1Marco Russo2Valeria La Parola3Giuseppe Marcì4Istituto per lo Studio dei Materiali Nanostrutturati, ISMN-CNR, Via Ugo La Malfa 153, 90146 Palermo, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, ISMN-CNR, Via Ugo La Malfa 153, 90146 Palermo, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, ISMN-CNR, Via Ugo La Malfa 153, 90146 Palermo, ItalyIstituto per lo Studio dei Materiali Nanostrutturati, ISMN-CNR, Via Ugo La Malfa 153, 90146 Palermo, ItalyDipartimento di Ingegneria, Viale delle Scienze, edificio n° 6,Università di Palermo, 90128 Palermo, ItalyDifferent solid sulfonic titania-based catalysts were investigated for the hydrothermal dehydration of fructose to 5-hydroxymethylfurfural (5-HMF). The catalytic behavior of the materials was evaluated in terms of fructose conversion and selectivity to 5-HMF. The surface and structural properties of the catalysts were investigated by means of X-ray diffraction (XRD), N<sub>2</sub> adsorption isotherms, thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and acid capacity measurements. Special attention was focused on the reaction conditions, both in terms of 5-HMF selectivity and the sustainability of the process, choosing water as the solvent. Among the various process condition studied, TiO<sub>2</sub>-SO<sub>3</sub>H catalyzed a complete conversion (99%) of 1.1M fructose and 5-HMF selectivity (50%) and yield (50%) at 165 °C. An important improvement of the HMF selectivity (71%) was achieved when the reaction was carried out by using a lower fructose concentration (0.1M) and lower temperature (140 °C). The catalytic activities of the materials were related to their acid capacities as much as their textural properties. In particular, a counterbalance between the acidity and the structure of the pores in which the catalytic sites are located, results in the key issue for switch the selectivity towards the achievement of 5-HMF.https://www.mdpi.com/1996-1944/13/5/1178hmfsolid acid catalyststitaniabiomasshydrothermal dehydration |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Maria Luisa Testa Gianmarco Miroddi Marco Russo Valeria La Parola Giuseppe Marcì |
spellingShingle |
Maria Luisa Testa Gianmarco Miroddi Marco Russo Valeria La Parola Giuseppe Marcì Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts Materials hmf solid acid catalysts titania biomass hydrothermal dehydration |
author_facet |
Maria Luisa Testa Gianmarco Miroddi Marco Russo Valeria La Parola Giuseppe Marcì |
author_sort |
Maria Luisa Testa |
title |
Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts |
title_short |
Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts |
title_full |
Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts |
title_fullStr |
Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts |
title_full_unstemmed |
Dehydration of Fructose to 5-HMF over Acidic TiO<sub>2</sub> Catalysts |
title_sort |
dehydration of fructose to 5-hmf over acidic tio<sub>2</sub> catalysts |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-03-01 |
description |
Different solid sulfonic titania-based catalysts were investigated for the hydrothermal dehydration of fructose to 5-hydroxymethylfurfural (5-HMF). The catalytic behavior of the materials was evaluated in terms of fructose conversion and selectivity to 5-HMF. The surface and structural properties of the catalysts were investigated by means of X-ray diffraction (XRD), N<sub>2</sub> adsorption isotherms, thermo-gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and acid capacity measurements. Special attention was focused on the reaction conditions, both in terms of 5-HMF selectivity and the sustainability of the process, choosing water as the solvent. Among the various process condition studied, TiO<sub>2</sub>-SO<sub>3</sub>H catalyzed a complete conversion (99%) of 1.1M fructose and 5-HMF selectivity (50%) and yield (50%) at 165 °C. An important improvement of the HMF selectivity (71%) was achieved when the reaction was carried out by using a lower fructose concentration (0.1M) and lower temperature (140 °C). The catalytic activities of the materials were related to their acid capacities as much as their textural properties. In particular, a counterbalance between the acidity and the structure of the pores in which the catalytic sites are located, results in the key issue for switch the selectivity towards the achievement of 5-HMF. |
topic |
hmf solid acid catalysts titania biomass hydrothermal dehydration |
url |
https://www.mdpi.com/1996-1944/13/5/1178 |
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1724954412810502144 |