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Effect of TEMPO and characterization of bio-oil from cellulose liquefaction in supercritical ethanol

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  • Sun, Jiao
  • Xie, Xin-an
  • Fan, Di
  • Wang, Xin
  • Liao, Weiting

Abstract

Cellulose liquefaction in supercritical ethanol with 2,2,6,6-Tetramethylpiperidinooxy (TEMPO) was carried out in a stainless autoclave. The influence of process parameters on bio-oil (BO) and platform chemicals, mainly including the dosage of TEMPO, reaction temperature and reaction time, were investigated. Characterization of liquefaction products was explored by fourier transform infrared (FTIR) and gas chromatography-mass spectrometry analysis (GC-MS). The maximum yield of BO (57.98%) was obtained from cellulose liquefaction at 320 °C, 4 g TEMPO and moderate time of 60 min. It showed that the conversion rate and yield of BO was significantly improved by 46.14% and 31.87% due to temperature and TEMPO respectively. The relative contents of dominant platform chemicals in bio-oil were as follows approximately: ketones > esters > alkanes > alcohols > acids. The total yields of ketones enhanced markedly (from 20.00 to 41.83%) with the increasing of TEMPO. The results showed that TEMPO catalyst under appropriate reaction conditions improved the selectivity of platform chemicals with carbonyl, which had an obvious contribution on the converting of ketones.

Suggested Citation

  • Sun, Jiao & Xie, Xin-an & Fan, Di & Wang, Xin & Liao, Weiting, 2020. "Effect of TEMPO and characterization of bio-oil from cellulose liquefaction in supercritical ethanol," Renewable Energy, Elsevier, vol. 145(C), pages 1949-1956.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:1949-1956
    DOI: 10.1016/j.renene.2019.07.098
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    Cited by:

    1. Echaroj, Snunkhaem & Santikunaporn, Malee & Phan, Anh N., 2023. "Supercritical ethanol liquefaction of bamboo leaves using functionalized reduced graphene oxides for high quality bio-oil production," Renewable Energy, Elsevier, vol. 204(C), pages 848-857.

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