Mechanism of ketones formation from cellulose liquefaction in sub- and supercritical ethanol

Tao, Hong-Xiu; Xie, Xianmei; Tang, Cheng-zheng; Tian, Weizhong

doi:10.1016/s1872-5813(13)60010-9

Cited by 32 publications

(15 citation statements)

References 9 publications

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“…38,39 Therefore, water promotes the formation of ketones through cyclization while methanol favors the formation of esters through esterification. Large amount of sugar compounds, such as D-mannopyranoside and D-alloose, were detected in the SP from cellulose decomposition in methanol.…”

Section: Degradation Of Cellulose Hemicellulose and Lignin As Showmentioning

confidence: 99%

Poplar Liquefaction in Water/Methanol Cosolvents

et al. 2015

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Poplar liquefaction (PL) in methanol, water or water/methanol co-solvents (WMCSs) was investigated at 240-320 o C for 0-90 min. The results show that the yields of bio-oils (BOs) obtained from PL in WMCSs are higher than those in either methanol or water, indicating that methanol has synergic effect with water on PL. The maximum BO yield of 44.2% was obtained at 270 o C for 15 min in a WMCS containing 70 vol% of water. The BOs were analyzed with a gas chromatograph/mass spectrometer (GC/MS) and Fourier transform infrared (FTIR) spectrometer.Poplar and its residues were analyzed with the FTIR spectrometer and a scanning electron microscope (SEM). The fiber structure of poplar was significantly destroyed during PL in WMCS based on the SEM observation. According to GC/MS analysis, the BOs mainly consist of hydrocarbons, phenols, furans, other ethers, aldehydes, ketones, carboxylic acids, esters, and nitrogen-containing organic compounds. Among of them, phenols, ketones, and esters are the main group components. To investigate the liquefaction mechanism, the three major components in biomass, i.e., cellulose, hemicellulose, and lignin, were subjected to degradation in the same solvents. The results suggest that WMCS exhibits better synergic effects for cellulose and hemicellulose than for lignin. Further investigations are needed for detailed mechanism on synergic effects.

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Section: Degradation Of Cellulose Hemicellulose and Lignin As Showmentioning

confidence: 99%

Poplar Liquefaction in Water/Methanol Cosolvents

et al. 2015

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“…[17] Ester compounds in bio-oils help to reduce some of the unwelcome properties of typical bio-oils, such as high acidity,c orrosiveness, and thermali nstability. [43] They investigated the effect of ethanol/cellulose ratio on the bio-oil yield and its composition. [43] They investigated the effect of ethanol/cellulose ratio on the bio-oil yield and its composition.…”

Section: Deconstruction Of Cellulose In Ethanolmentioning

confidence: 99%

“…[17,42] Ta oa nd co-workersc arriedo ut the decomposition of cellulose in ethanol at 320 8Cf or 60 min. [43] They investigated the effect of ethanol/cellulose ratio on the bio-oil yield and its composition. The highest conversion andb io-oil yield werea pproximately 86 %a nd 55 wt %, respectively,a nd were obtaineda ta solventt oc ellulose ratio of 10:7.…”

Section: Deconstruction Of Cellulose In Ethanolmentioning

confidence: 99%

Ethanol: A Promising Green Solvent for the Deconstruction of Lignocellulose

et al. 2018

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Growing energy demand, environmental impact, energy security issues, and rural economic development have encouraged the development of sustainable renewable fuels. Nonfood lignocellulosic biomass is a suitable source for sustainable energy because the biomass feedstocks are low cost, abundant, and carbon neutral. Recent thermochemical conversion studies are frequently directed at converting biomass into high-quality liquid fuel precursors or chemicals in a single step. Supercritical ethanol has been selected as a promising solvent medium to deconstruct lignocellulosic biomass because ethanol has extraordinary solubility towards lignocellulosic biomass and can be resourced from cellulosic ethanol facilities. This review provides a critical insight into both catalytic and noncatalytic strategies of lignocellulose deconstruction. In this context, the supercritical ethanol deconstruction pathways are thoroughly reviewed; GC-MS, 1D and 2D NMR spectroscopy, and elemental analysis strategies towards liquid biomass deconstruction products are also critically presented. This review aims to provide readers a broad and accurate roadmap of novel biomass to biofuel conversion techniques.

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“…Noteworthily, the total yield of ketones almost trended contrary to that of esters under the reaction conditions. Ketones and esters mainly come from cellulose and hemicellulose decomposition [26,38]. As a result, the competition may exist in the formation process of ketones and esters.…”

Section: Analyses Of the Bos With Ftir And Gc/msmentioning

confidence: 99%