Catalytic hydrothermal conversion of macroalgae-derived alginate: effect of pH on production of furfural and valuable organic acids under subcritical water conditions

Jeon, Wonjin; Ban, Chunghyeon; Park, Geonu; Yu, Taekyung; Suh, Jeong‐Yong; Woo, Hee Chul; Kim, Do Heui

doi:10.1016/j.molcata.2015.01.011

Cited by 33 publications

(10 citation statements)

References 45 publications

(59 reference statements)

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“…The use of another feedstock: sodium alginate and another solvent in presence or not of a catalyst permitted to have a fast decomposition of alginate at higher temperature (Jeon et al, 2015 ). However, in catalyst-free sub-critical water (pH = 7), the average molecular weight of products obtained at 250°C was higher than that for products generated under acid and base catalysts.…”

Section: Synthesis Of Furfural From Sugars and Polysaccharides Withoumentioning

confidence: 99%

Hydrolysis of Hemicellulose and Derivatives—A Review of Recent Advances in the Production of Furfural

et al. 2018

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Biobased production of furfural has been known for decades. Nevertheless, bioeconomy and circular economy concepts is much more recent and has motivated a regain of interest of dedicated research to improve production modes and expand potential uses. Accordingly, this review paper aims essentially at outlining recent breakthroughs obtained in the field of furfural production from sugars and polysaccharides feedstocks. The review discusses advances obtained in major production pathways recently explored splitting in the following categories: (i) non-catalytic routes like use of critical solvents or hot water pretreatment, (ii) use of various homogeneous catalysts like mineral or organic acids, metal salts or ionic liquids, (iii) feedstock dehydration making use of various solid acid catalysts; (iv) feedstock dehydration making use of supported catalysts, (v) other heterogeneous catalytic routes. The paper also briefly overviews current understanding of furfural chemical synthesis and its underpinning mechanism as well as safety issues pertaining to the substance. Eventually, some remaining research topics are put in perspective for further optimization of biobased furfural production.

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Section: Synthesis Of Furfural From Sugars and Polysaccharides Withoumentioning

confidence: 99%

Hydrolysis of Hemicellulose and Derivatives—A Review of Recent Advances in the Production of Furfural

et al. 2018

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“…It was found that an increase in temperature favored alginate conversion and acid yields. Jeon et al 3 found that glycolic acid and furfural were formed in acidic medium, whereas fumaric, lactic, and malic acids were formed in alkaline solutions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production by Reforming of Sodium Alginate in the Liquid Phase over Pt/C Catalyst

Kalekar

Vaidya

2021

Ind. Eng. Chem. Res.

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Wet biomass such as macroalgae (or seaweeds) can be effectively converted into a H 2 -rich gaseous product by catalytic reforming in the liquid phase. Sodium alginate (SA)a major constituent of such biomasswas chosen as the model compound for this study on aqueous-phase reforming (APR). Trials were performed in the 200−230 °C range in a stirred batch reactor for up to 6 h using different alginate concentrations (0.5−2.5 wt %) in aqueous solutions. Low-molecular-weight organic acids such as acetic, propionic, lactic, and succinic acids and gaseous product comprising H 2 , CH 4 , CO, and CO 2 were formed. Contrary to the noncatalytic process, H 2 was selectively produced over commercial 5% Pt/C catalyst for loadings between 2 and 6 kg/m 3 . After 3 h of reaction over Pt/C at T = 225 °C, the values of carbon conversion into gas phase (X) and selectivity to H 2 (S-H 2 ) and H 2 yield (Y-H 2 ) were 9.7, 32.5, and 1.4% respectively. Other noble metals were also tested; however, Pt/C performed better than Ru/C and Pd/C. Several features of Pt/C were investigated using electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, and NH 3 -temperature-programmed desorption techniques. A possible reaction scheme for alginate conversion to products was discussed. Despite the low H 2 yield, this work provided the desired starting point for improved macroalgae-to-H 2 conversions via APR.

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“…The catalytic hydrothermal hydrolysis is also used for the conversion of macroalgae-derived alginate into furfural and valuable organic acids under subcritical water conditions [107]. The influence of the pH was studied to obtain different products, such as lactic, fumaric, and malic acids, when pH is 13 (using NaOH), whereas mannunoric, guluronic, furfural and glycolic acids prevailed at pH 1 (using HCl) using alginate concentrations of 20 g/L.…”

Section: Production Of Biosugars and Value-added Products By Catalytimentioning

confidence: 99%

Catalytic Processes from Biomass-Derived Hexoses and Pentoses: A Recent Literature Overview

2018

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Biomass is a plentiful renewable source of energy, food, feed and chemicals. It fixes about 1–2% of the solar energy received by the Earth through photosynthesis in both terrestrial and aquatic plants like macro- and microalgae. As fossil resources deplete, biomass appears a good complement and eventually a good substitute feedstock, but still needs the development of relatively new catalytic processes. For this purpose, catalytic transformations, whether alone or combined with thermal ones and separation operations, have been under study in recent years. Catalytic biorefineries are based on dehydration-hydrations, hydrogenations, oxidations, epimerizations, isomerizations, aldol condensations and other reactions to obtain a plethora of chemicals, including alcohols, ketones, furans and acids, as well as materials such as polycarbonates. Nevertheless, there is still a need for higher selectivity, stability, and regenerability of catalysts and of process intensification by a wise combination of operations, either in-series or combined (one-pot), to reach economic feasibility. Here we present a literature survey of the latest developments for obtaining value-added products using hexoses and pentoses derived from lignocellulosic material, as well as algae as a source of carbohydrates for subsequent transformations.

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Catalytic hydrothermal conversion of macroalgae-derived alginate: effect of pH on production of furfural and valuable organic acids under subcritical water conditions

Cited by 33 publications

References 45 publications

Hydrolysis of Hemicellulose and Derivatives—A Review of Recent Advances in the Production of Furfural

Hydrolysis of Hemicellulose and Derivatives—A Review of Recent Advances in the Production of Furfural

Hydrogen Production by Reforming of Sodium Alginate in the Liquid Phase over Pt/C Catalyst

Catalytic Processes from Biomass-Derived Hexoses and Pentoses: A Recent Literature Overview

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