热解温度对纤维素和木质素成炭结构的影响

doi:10.3969/j.issn.1673-5854.2021.03.001

Abstract

Abstract:

This work focused with the assistance of the mechanism of pyrolysis carbonization of cellulose, lignin and hemicellulose were analysed by TG, TEM, Raman, XRD, and FT-IR based on the molecular restructuring behavior of three major components of cellulose, lignin and hemicellulose during pyrolysis. The results showed that hemicellulose was completely decomposed during pyrolysis; molecular rearrangement occurred during the pyrolysis of cellulose, forming crystallized areas in biomass char; lignin had a very complex cross-linked structure, melted during pyrolysis, forming amorphous carbon areas in biomass char. During the charring process, cellulose undergone mainly dehydration reactions when the temperature was lower than 200 ℃, and the temperature range of 200 to 400 ℃ was the main stage of pyrolysis; lignin was relatively structurally stable in the studied temperature range(200-500 ℃), with only partial structural transformation occurring while softening and melting.

Key words: cellulose, lignin, pyrolysis mechanism, carbon microcrystallines, amorphous carbon

CLC Number:

TQ35
TQ424

Dichao WU, Chao CHEN, Xinglong HOU, Kang SUN. Effect of Pyrolysis Temperature on Structures of Chars Forming from Cellulose and Lignin[J]. Biomass Chemical Engineering, 2021, 55(3): 1-9.

Figures/Tables 10

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样品samples	炭化得率carbonization yield/%
样品samples	300 ℃	400 ℃	500 ℃	600 ℃	700 ℃	800 ℃
木质素lignin	70.79	55.61	45.23	42.67	40.19	38.28
纤维素cellulose	52.15	30.96	25.28	18.67	13.19	11.63
木聚糖xylan	40.62	16.48	8.14	1.81	0.37	0.22

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Effect of Pyrolysis Temperature on Structures of Chars Forming from Cellulose and Lignin

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