Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Comparative study about catalytic liquefaction of alkali lignin to aromatics by HZSM-5 in sub- and supercritical ethanol
In this paper, HZSM-5 catalysts were first combined with sub- and supercritical ethanol (scEtOH) in alkali lignin catalytic liquefaction to produce bio-oil, and the synergistic effect of different reaction parameters (temperature, catalytic content, and reaction time) on conversion as well as product yields (bio-oil, solid residue, and aromatic compounds) was systematically studied. Gas chromatography mass spectrometry (GC-MS) and Fourier transform infrared spectroscopy analyses were carried out to evaluate the composition of main products. Treatment of alkali lignin with 10%HZSM-5 catalyst in scEtOH at 360 °C for 90 min resulted in the highest bio-oil yield of 53.81 wt. %. It has also been confirmed that a combination of HZSM-5 catalyst in subcritical ethanol is beneficial for saving the reaction time and inhibitation of repolymerization reaction. On the basis of GC-MS analysis, the combination of HZSM-5 catalysts and scEtOH resulted in the highest relative content of total aromatic compounds, reaching 71.61% at 280 °C. The most abundant monomers produced in the identical liquefaction are phenols and aromatic hydrocarbons.
Comparative study about catalytic liquefaction of alkali lignin to aromatics by HZSM-5 in sub- and supercritical ethanol
In this paper, HZSM-5 catalysts were first combined with sub- and supercritical ethanol (scEtOH) in alkali lignin catalytic liquefaction to produce bio-oil, and the synergistic effect of different reaction parameters (temperature, catalytic content, and reaction time) on conversion as well as product yields (bio-oil, solid residue, and aromatic compounds) was systematically studied. Gas chromatography mass spectrometry (GC-MS) and Fourier transform infrared spectroscopy analyses were carried out to evaluate the composition of main products. Treatment of alkali lignin with 10%HZSM-5 catalyst in scEtOH at 360 °C for 90 min resulted in the highest bio-oil yield of 53.81 wt. %. It has also been confirmed that a combination of HZSM-5 catalyst in subcritical ethanol is beneficial for saving the reaction time and inhibitation of repolymerization reaction. On the basis of GC-MS analysis, the combination of HZSM-5 catalysts and scEtOH resulted in the highest relative content of total aromatic compounds, reaching 71.61% at 280 °C. The most abundant monomers produced in the identical liquefaction are phenols and aromatic hydrocarbons.
Comparative study about catalytic liquefaction of alkali lignin to aromatics by HZSM-5 in sub- and supercritical ethanol
Fan, Di (Autor:in) / Xie, Xin-an (Autor:in) / Li, Yan (Autor:in) / Li, Lu (Autor:in) / Sun, Jiao (Autor:in)
01.01.2018
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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