Coliquefaction of Lignite and Corn Stalk in Ethanol-Water Mixed Solvent with Addition of Formic Acid and Iron Ore Catalyst

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Hengfu Shui
  • Hanren Jiao
  • Fang He
  • Tao Shui
  • Xiaoling Wang
  • Hua Zhou
  • Chunxiu Pan
  • Zhicai Wang
  • Zhiping Lei
  • Shibiao Ren
  • Shigang Kang

Detail(s)

Original languageEnglish
Pages (from-to)3022-3030
Journal / PublicationEnergy and Fuels
Volume32
Issue number3
Publication statusPublished - 15 Mar 2018
Externally publishedYes

Abstract

The coliquefaction of Xilinguole lignite (XL) and corn stalk (CS) was carried out in water, ethanol, and ethanol-water mixed solvent at different mixing ratios with or without iron ore as catalyst, under initial N2 atmosphere. Results showed that ethanol improved the liquefaction and coliquefaction of XL and CS. The liquefaction of XL and CS separately resulted in 31.0 and 41.9 wt % of oil yield in ethanol and 7.3 and 20.2 wt % of oil yield in water, respectively, whereas the ethanol and water coliquefaction process resulted in 34.4 and 13.2 wt % of oil yield, respectively. The addition of formic acid increased the oil yield in the single liquefaction of XL and CS and their coliquefaction in ethanol, water, or ethanol-water (50:50, v/v). The liquefaction of XL and CS and coliquefaction of XL/CS in ethanol at N2 atmosphere with formic acid resulted in higher oil and conversion yields, suggesting that formic acid can supply active hydrogen. Also, iron ore was an effective catalyst, for instance, adding 20 wt % H2-reduced hematite improved the oil yield by 9.2 and 6.3 wt % for XL and CS, respectively, compared with those without catalyst. Besides, XL/CS coliquefaction in ethanol and formic acid at 400 °C resulted in a 10.9 wt % oil yield increase. A synergistic effect promoted by the H2-reduced hematite catalyst was clearly present in the coliquefaction of XL and CS at 400 °C. The liquefied products characterization suggested that the ore catalyst promoted XL converting into oil fraction and thus enhanced the liquefaction conversion and oil yield. © 2018 American Chemical Society.

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Citation Format(s)

Coliquefaction of Lignite and Corn Stalk in Ethanol-Water Mixed Solvent with Addition of Formic Acid and Iron Ore Catalyst. / Shui, Hengfu; Jiao, Hanren; He, Fang et al.
In: Energy and Fuels, Vol. 32, No. 3, 15.03.2018, p. 3022-3030.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review