Catalytic dehydration of hexose sugars to 5‐hydroxymethylfural

Zou, Xianli; Zhu, Chang; Wang, Qian; Yang, Gang

doi:10.1002/bbb.1932

Cited by 39 publications

(28 citation statements)

References 159 publications

(333 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, although significant increment was seen on the total sugar of the biomass after hydrothermal pretreatment, the 40‐ and 60‐minute boiled coconut residue was observed to have moderate decrement. This can be attributed to the extensive exposure to heat, which was described by Zou et al 34 Similar results were reported on reduction on total sugar from hydrothermally treated biomasses on 40 and 60 minutes 35,36 . On the other hand, the reducing sugar yield of hydrothermally pretreated biomass was observed to be lower compared to the untreated biomass.…”

Section: Resultssupporting

confidence: 84%

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

et al. 2020

View full text Add to dashboard Cite

The objective of this study is to explore the feasibility of sequential hydrothermal and alkaline pretreatment in improving enzymatic hydrolysis and sugar production of coconut pulp residue for bioethanol production. Hydrothermal pretreatment with the different heating duration of 20, 40, 60 minutes yielded 32.27, 27.51, and 26.72 g/L of total sugar, respectively. After posttreatment with 1%, 2%, and 3% alkaline treatment, the further increment of almost 90% on sugar production was observed. Compared to the single pretreatment, the combination of hydrothermal and alkaline pretreatment significantly affected the enzymatic hydrolysis. The optimum condition for efficient hydrolysis was 40 minutes hydrothermal pretreatment, followed by 1% NaOH posttreatment. At these conditions, the total and reducing sugar was 257.14 ± 0.92 and 102.86 ± 0.82 g/L and the maximum ethanol achieved was 27.19 g/L on the 48 hours of fermentation with efficiency and ethanol productivity of 51.83% and 0.57 g/L/h, respectively.

show abstract

Section: Resultssupporting

confidence: 84%

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Concerning the side products of the reaction, only some small amounts of levulinic and formic acids were found in HPLC analyses of the reactions mixtures (yields below 4%), which suggests that Nb 2 O 5 _SA was unable to effectively rehydrate HMF, contrary to the previous reports dealing with heterogeneous catalysts applied in aqueous environment [ 14 , 71 ]. This is related to the lack of substantially strong BA sites on the surface of Nb 2 O 5 _SA.…”

Section: Resultscontrasting

confidence: 74%

“…The HMF yield obtained via dehydration of carbohydrates depends significantly on the type of sugar molecule used as a substrate. Fructose is generally found to be more reactive and selective towards HMF than glucose [ 14 , 15 , 16 ]. Thus far, the highest success in the efficient synthesis of HMF has been obtained using fructose as a feedstock and catalysts containing Brønsted acid (BA) sites [ 7 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of Thermal Treatment of Nb2O5 on Its Performance in Glucose Dehydration to 5-Hydroxymethylfurfural in Water

et al. 2020

View full text Add to dashboard Cite

The cascade dehydration of glucose to 5-hydroxymethylfurfural (HMF) was carried out in water over a series of Nb2O5 catalysts, which were derived from the thermal treatment of niobic acid at 300 and 550 °C, under air or inert atmosphere. Amorphous niobic acid showed high surface area (366 m2/g) and large acidity (2.35 mmol/g). With increasing the temperature of the thermal treatment up to 550 °C, the amorphous Nb2O5 was gradually transformed into a pseudohexagonal phase, resulting in a decrease in surface area (27–39 m2/g) and total acidity (0.05–0.19 mmol/g). The catalysts’ performance in cascade dehydration of glucose realized in pure water was strongly influenced by the total acidity of these materials. A remarkable yield of 37% HMF in one-pot reaction in water was achieved using mesoporous amorphous niobium oxide prepared by thermal treatment of niobic acid at 300 °C in air. The best-performing catalyst displayed a total acidity lower than niobic acid (1.69 mmol/g) which afforded a correct balance between a high glucose conversion and limited further conversion of the target product to numerous polymers and humins. On the other hand, the treatment of niobic acid at 550 °C, independently of the atmosphere used during the sample preparation (i.e., air or N2), resulted in Nb2O5 catalysts with a high ratio of Lewis to Brønsted acid sites and poor total acidity. These materials excelled at catalyzing the isomerization step in the tandem process.

show abstract

“…FDCA can be purified by crystallization [ 49 ]. The state-of-the-art production of FDCA entails the hydrothermal conversion of fructose into hydroxymethyl furfural, which can be further oxidized to FDCA [ 50 , 51 ]. The latter step can be efficiently accomplished in a biocatalytical manner [ 52 ] with different fermentation protocols [ 53 , 54 , 55 , 56 , 57 ].…”

Section: Introductionmentioning

confidence: 99%

Poly(Ethylene Furanoate) along Its Life-Cycle from a Polycondensation Approach to High-Performance Yarn and Its Recyclate

et al. 2021

View full text Add to dashboard Cite

We report on the pilot scale synthesis and melt spinning of poly(ethylene furanoate) (PEF), a promising bio-based fiber polymer that can heave mechanical properties in the range of commercial poly(ethylene terephthalate) (PET) fibers. Catalyst optimization and solid state polycondensation (SSP) allowed for intrinsic viscosities of PEF of up to 0.85 dLꞏg−1. Melt-spun multifilament yarns reached a tensile strength of up to 65 cN.tex−1 with an elongation of 6% and a modulus of 1370 cN.tex−1. The crystallization behavior of PEF was investigated by differential scanning calorimetry (DSC) and XRD after each process step, i.e., after polymerization, SSP, melt spinning, drawing, and recycling. After SSP, the previously amorphous polymer showed a crystallinity of 47%, which was in accordance with literature. The corresponding XRD diffractograms showed signals attributable to α-PEF. Additional, clearly assignable signals at 2θ > 30° are discussed. A completely amorphous structure was observed by XRD for as-spun yarns, while a crystalline phase was detected on drawn yarns; however, it was less pronounced than for the granules and independent of the winding speed.

show abstract

Catalytic dehydration of hexose sugars to 5‐hydroxymethylfural

Cited by 39 publications

References 159 publications

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

Bioethanol production from coconut pulp residue using hydrothermal and postalkaline pretreatment

Impact of Thermal Treatment of Nb2O5 on Its Performance in Glucose Dehydration to 5-Hydroxymethylfurfural in Water

Poly(Ethylene Furanoate) along Its Life-Cycle from a Polycondensation Approach to High-Performance Yarn and Its Recyclate

Contact Info

Product

Resources

About