Kinetics and reaction chemistry for slow pyrolysis of enzymatic hydrolysislignin and organosolv extracted lignin derived from maplewood

有机溶剂 木质素 化学 热解 愈创木酚 热重分析 有机化学 酶水解 核化学 水解 催化作用
作者
Joungmo Cho,Sheng Yuan Chu,Paul J. Dauenhauer,George W. Huber
出处
期刊:Green Chemistry [Royal Society of Chemistry]
卷期号:14 (2): 428-439 被引量:110
标识
DOI:10.1039/c1gc16222e
摘要

The kinetics and reaction chemistry for the pyrolysis of Maplewood lignin were investigated using both a pyroprobe reactor and a thermogravimetric analyser mass spectrometry (TGA-MS). Lignin residue after enzymatic hydrolysis and organosolv lignin derived from Maplewood were used to measure the kinetic behaviours of lignin pyrolysis and to analyse pyrolysis product distributions. The enzymatic lignin residue pyrolyzed at lower temperature than that of organosolv lignin. The differential thermogravimetric (DTG) peaks for pyrolysis of the enzymatic residue were more similar to the DTG peaks for pyrolysis of the original Maplewood than DTG of the organosolv lignin. The condensable liquid volatile products were collected from a Pyroprobe reactor with a liquid nitrogen trap. The primary monomeric phenolic compounds were guaiacol, syringol, and vanillic acid. However, only 14–36 carbon% of the sample could be detected by GC-MS. Over 60 carbon% of the condensable products were heavy tar molecules that are not detectable by GC-MS. These heavy tar molecules are the primary products from pyrolysis of lignin. Intermediate solid samples were also collected at various pyrolysis temperatures and characterized by elemental analysis, FT-IR, DP-MAS 13C NMR, and TOC. The methoxy groups and ether linkages decreased and the non-protonated aromatic carbon–carbon bonds increased in the solid residues as the pyrolysis temperature increased. The carbon content of the initial lignin feed (derived from enzymatic hydrolysis) and the solid polyaromatics residue (obtained at 773 K) was 58 wt% and 74 wt% respectively. This polyaromatic residue contained about 69 wt% of the original lignin feed. The solid polyaromatics undergo further slow decomposition accompanied by a constant release of carbon dioxide as the pyrolysis reaction continues. The pyrolysis of the enzymatic lignin residue was modelled by two reactions in series. In the first pyrolysis step the lignin was decomposed with an apparent activation energy of 74 kJ mol−1 and a heat of reaction of −8,780 kJ kg−1. The second pyrolysis step had an apparent activation energy of 110 kJ mol−1 and a heat of reaction of −2,819 kJ kg−1. Lignin pyrolysis has lower activation energies and higher heats of reaction than cellulose pyrolysis.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
铭心发布了新的文献求助10
刚刚
盏茶轻抿完成签到,获得积分10
刚刚
反方向的枫完成签到,获得积分10
刚刚
kate完成签到,获得积分10
刚刚
深情安青应助幸运在我采纳,获得10
2秒前
2秒前
科研通AI2S应助Alvin采纳,获得10
2秒前
科研通AI2S应助彭佳乐采纳,获得10
2秒前
von发布了新的文献求助30
2秒前
为治完成签到,获得积分10
3秒前
飞飞飞飞飞完成签到,获得积分10
3秒前
3秒前
科研_小白完成签到,获得积分10
3秒前
未命名应助DYQin采纳,获得10
3秒前
hanshishengye完成签到 ,获得积分10
3秒前
榆术山支子完成签到,获得积分10
3秒前
zz包子发布了新的文献求助30
3秒前
慕屹川发布了新的文献求助10
4秒前
wille完成签到,获得积分10
4秒前
4秒前
4秒前
4秒前
5秒前
jessieinfrance完成签到,获得积分10
6秒前
铭心完成签到,获得积分10
6秒前
Sylvia完成签到,获得积分10
6秒前
6秒前
zzz完成签到,获得积分10
6秒前
VELPRO完成签到,获得积分10
6秒前
7秒前
短短完成签到,获得积分10
7秒前
7秒前
7秒前
bob完成签到,获得积分10
8秒前
谦让的牛排完成签到,获得积分10
8秒前
碧蓝白玉完成签到,获得积分10
8秒前
Meima完成签到,获得积分10
9秒前
9秒前
Sarah发布了新的文献求助10
9秒前
小静发布了新的文献求助10
9秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Immigrant Incorporation in East Asian Democracies 600
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
不知道标题是什么 500
A Preliminary Study on Correlation Between Independent Components of Facial Thermal Images and Subjective Assessment of Chronic Stress 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3968771
求助须知:如何正确求助?哪些是违规求助? 3513646
关于积分的说明 11169065
捐赠科研通 3249011
什么是DOI,文献DOI怎么找? 1794589
邀请新用户注册赠送积分活动 875236
科研通“疑难数据库(出版商)”最低求助积分说明 804740