Thermal behavior of native, washed and steam exploded lignocellulosic biomass samples

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[1] Sebestyén, Zoltán
[2] Jakab, Emma
[3] May, Zoltán
[4] Sipos, Bálint
[5] Réczey, Kati
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Sebestyén, Z. (sebestyen.zoltan@ttk.mta.hu) | 1600年 / Elsevier B.V., Netherlands卷 / 101期
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The aim of this study was to evaluate the chemical changes in the main components (cellulose; hemicellulose and lignin) of various lignocellulosic biomass samples during the steam explosion pretreatment. Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry/mass spectrometry (TG/MS) measurements have been performed on different native; washed and steam exploded woody (willow and spruce) and herbaceous (hemp; wheat straw and sweet sorghum bagasse) biomass samples. The main differences between the thermal decomposition of the samples are interpreted in terms of the altered structure of the biomass samples by the effective steam explosion treatment and the different alkali ion contents which have been determined using inductively coupled plasma-optical emission spectroscopy (ICP-OES) method. In order to separate these two effects; the native biomass samples have been washed with hot water to remove the main parts of the potassium and sodium ions. The concentration of K+ and Na+ has been reduced in the treated biomass samples so the thermal decomposition mechanism has been altered due to the elimination of the catalytic effects. Principal Component Analysis (PCA) has been used to find statistical correlations between the data. The functional group compositions of the lignin molecules have been modified significantly as indicated by the pyrograms and the score plot of the PCA. The amount of hemicellulose has been reduced. On the other hand; the relative amount of the structurally modified cellulose has been increased in the samples by the steam explosion pretreatment step. © 2013 Elsevier B.V. All rights reserved;
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