Author
Luca Ricciardi
Bio: Luca Ricciardi is an academic researcher from University of Twente. The author has contributed to research in topics: Biomass (ecology) & Selectivity. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.
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TL;DR: An efficient heterogeneous acid catalyst was prepared via the growth of a thiol-functionalized third-generation dendrimer on the surface of cellulose employing thiolene click chemistry, followed by the formation of sulfonic acid groups via the oxidation of thiol groups as discussed by the authors .
Abstract: An efficient heterogeneous acid catalyst was prepared via the growth of a thiol-functionalized third-generation dendrimer on the surface of cellulose employing thiol–ene click chemistry, followed by the formation of sulfonic acid groups via the oxidation of thiol groups.
14 citations
TL;DR: In this paper , a direct conversion reaction of glucose to 5-hydroxymethylfurfural (HMF) was studied using metal organic framework (MOF) as Lewisacid catalysts and a polyoxometalate (POM), silicotungstic acid, as a Brønsted type acid with a mixture of 1% glucose solution in γ-valerolactone (GVL)•10% H2O at 140 °C.
Abstract: The direct conversion reaction of glucose to 5‐hydroxymethylfurfural (HMF) is studied using metal organic framework (MOF) as Lewis‐acid catalysts and a polyoxometalate (POM), silicotungstic acid, as a Brønsted‐type acid with a mixture of 1% glucose solution in γ‐valerolactone (GVL)‐10% H2O at 140 °C. The study is carried out with two routes: one using MOF and POM tandem catalysts added independently and the other through the synthesis of a composite material denoted POM@MOF. The activity tests show that the profiles of the conversion and yield of HMF achieved in both routes are similar, with the reactions with MIL‐53(Al) and MIL‐101(Cr) catalysts producing the highest yield of HMF (40% after 8 h of reaction). Stability tests are performed on the POM@MOF catalysts based on MIL‐53(Al) and MIL‐101(Cr). MIL‐53(Al) and HSiW@MIL‐101(Cr) can be reused, showing a progressive loss in HMF yield due to the leaching of POM.
5 citations
TL;DR: In this paper , the degree of open structures (DOS) was determined by quantifying the formed carbonyl species by means of quantitative 19F NMR and potentiometric titration, and the progress of polymerization and ring opening were monitored by DSC and FT-IR spectroscopy.
Abstract: The chemistry of biomass-derived furans is particularly sensitive to ring openings. These side reactions occur during furfuryl alcohol polymerization. In this work, the furan ring-opening was controlled by changing polymerization conditions, such as varying the type of acidic initiator or the water content. The degree of open structures (DOS) was determined by quantifying the formed carbonyl species by means of quantitative 19F NMR and potentiometric titration. The progress of polymerization and ring opening were monitored by DSC and FT-IR spectroscopy. The presence of additional water is more determining on ring opening than the nature of the acidic initiator. Qualitative structural assessment by means of 13C NMR and FT-IR shows that, depending on the employed conditions, poly(furfuryl alcohol) samples can be classified in two groups. Indeed, either more ester or more ketone side groups are formed as a result of side ring opening reactions. The absence of additional water during FA polymerization preferentially leads to opened structures in the PFA bearing more ester moieties.
4 citations
3 citations
TL;DR: In this paper , Schiff-based macromolecular architectures were used to generate tough and ductile materials via the creation of Schiff-Based macromolescular architectures for poly(furfuryl alcohol) polymers.
Abstract: Poly(furfuryl alcohol) is a bio-based thermoset resin with a limited application portfolio due to its brittleness. Side ring-opening reactions that occur during polymerization lead to carbonyl moieties. Such unique self-generated functionality was exploited to generate tough and ductile materials via the creation of Schiff-based macromolecular architectures.
3 citations