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

生物质化学工程 ›› 2021, Vol. 55 ›› Issue (3): 1-9.doi: 10.3969/j.issn.1673-5854.2021.03.001

热解温度对纤维素和木质素成炭结构的影响

吴迪超¹^,²(), 陈超¹, 侯兴隆¹, 孙康¹^,*()

1. 中国林业科学研究院林产化学工业研究所; 生物质化学利用国家工程实验室; 国家林业和草原局林产化学工程重点实验室; 江苏省生物质能源与材料重点实验室, 江苏南京 210042
2. 南京林业大学江苏省林业资源高效加工利用协同创新中心, 江苏南京 210037

收稿日期:2020-05-18 出版日期:2021-05-30 发布日期:2021-05-20
通讯作者: 孙康 E-mail:18739563802@163.com;sunkang0226@163.com
作者简介:孙康, 研究员, 博士, 硕士生导师, 主要从事生物质热解与炭材料的理论研究、技术开发和成果转化工作; E-mail: sunkang0226@163.com
吴迪超(1995-), 男, 河南漯河人, 硕士生, 主要从事炭材料研究与应用; E-mail: 18739563802@163.com
基金资助:
国家自然科学基金资助项目(31770629)

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

Dichao WU¹^,²(), Chao CHEN¹, Xinglong HOU¹, Kang SUN¹^,*()

1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
2. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China

Received:2020-05-18 Online:2021-05-30 Published:2021-05-20
Contact: Kang SUN E-mail:18739563802@163.com;sunkang0226@163.com

摘要/Abstract

摘要：

从纤维素、木质素和半纤维素热解转化特征及分子重构建行为着手，利用TG、TEM、Raman、XRD、FT-IR等分析手段探究这3种物质的热解炭化机理。实验结果表明：半纤维素在炭化过程中几乎完全分解；链状结构的纤维素热分解脱除氢氧后，形成的碳自由基发生芳构化重排，大部分构成生物质热解炭中的结晶区；木质素分子结构复杂，呈交联态，在热解过程中同时发生软化熔融，大部分构成了生物质热解炭中的无定形区。在炭化过程中，纤维素在200 ℃之前主要发生脱水反应，200~400 ℃是热解的主要阶段；木质素在研究温度范围（200~500 ℃）内结构相对稳定，在软化熔融的同时仅发生部分结构转变。

关键词: 纤维素, 木质素, 热解机理, 碳微晶, 无定形碳

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

中图分类号:

TQ35
TQ424

吴迪超, 陈超, 侯兴隆, 孙康. 热解温度对纤维素和木质素成炭结构的影响[J]. 生物质化学工程, 2021, 55(3): 1-9.

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.

图/表 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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热解温度对纤维素和木质素成炭结构的影响

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

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