Effect of Cellulose Crystallinity on Solid/Liquid Phase Reactions Responsible for the Formation of Carbonaceous Residues during Pyrolysis

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• 作者：Zhouhong Wang ; Brennan Pecha ; Roel J. M. Westerhof ; Sascha R. A. Kersten ; Chun-Zhu Li ; Armando G. McDonald ; Manuel Garcia-Perez
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：February 26, 2014
• 年：2014
• 卷：53
• 期：8
• 页码：2940-2955
• 全文大小：1223K
• 年卷期：v.53,no.8(February 26, 2014)
• ISSN：1520-5045

文摘

This study reports changes in solid phase composition when samples of Avicel cellulose (crystallinity: 60.5%) and ball-milled microcrystalline cellulose (crystallinity: 6.5%) were subjected to pyrolysis in a spoon reactor. Solid state chemistry evolution was examined by hydrolysis-ion exchange chromatography, scanning electron miscroscopy (SEM), Fourier transform infrared (FTIR), and ¹³C nuclear magnetic resonance (NMR). The liquid reaction intermediate was found to cause particle agglomeration at temperatures below 300 掳C. At higher temperatures, the ball-milled cellulose melted completely but the more crystalline cellulose conserved its fibrous structure. The formation of C鈺怬 and C鈺怌 groups was accelerated by the presence of liquid intermediates derived from the amorphous cellulose. The content of cross-linked cellulose was quantified by the combined use of acid hydrolysis and ¹³C NMR. A new reaction mechanism to describe the changes in the solid residue composition at different reaction conditions is proposed.