基于TG-FTIR-MS技术的酶解木质素热解行为分析

doi:10.3969/j.issn.0253-2417.2021.06.005

林产化学与工业 ›› 2021, Vol. 41 ›› Issue (6): 36-42.doi: 10.3969/j.issn.0253-2417.2021.06.005

基于TG-FTIR-MS技术的酶解木质素热解行为分析

侯兴隆¹^,², 建晓朋¹^,², 许伟¹, 郭奇¹, 刘军利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:2021-05-11 出版日期:2021-12-28 发布日期:2021-12-31
通讯作者: 刘军利 E-mail:liujunli1974@126.com
作者简介:刘军利, 研究员, 博士生导师, 研究领域为生物质热化学转化技术、多孔质炭材料的制备及其应用技术; E-mail: liujunli1974@126.com
侯兴隆(1995-), 男, 山东威海人, 硕士生, 研究方向为多孔质炭材料的制备及应用研究
基金资助:
国家重点研发计划资助项目(2019YFB1503804);中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2018SZ011);江苏省333人才项目(BRA2019293)

Pyrolysis Behavior Analysis of Enzymolysis Lignin Based on TG-FTIR-MS Technology

Xinglong HOU¹^,², Xiaopeng JIAN¹^,², Wei XU¹, Qi GUO¹, Junli LIU¹^,*()

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:2021-05-11 Online:2021-12-28 Published:2021-12-31
Contact: Junli LIU E-mail:liujunli1974@126.com

摘要/Abstract

摘要：

为了给磷酸法制备木质素基活性炭活化条件分析提供理论基础，实验对酶解木质素（EL）、磷酸浸渍酶解木质素（EL-P）进行恒速升温热重分析，以及模拟制备活性炭过程中的实验条件的变速升温热重分析。恒速升温热重分析发现EL热解过程主要发生在300~360 ℃，EL-P热解温度提前，证明磷酸在低温下即与EL发生反应。变速升温增加了木质素热解反应时间，主要失重峰从EL恒速升温过程的一个分裂为两个峰，木质素热解更加充分，EL-P热解产物残留量从恒速升温的57.42%降低到39.93%。变速热解与恒速热解相比，增加了恒温过程，最终热解产物残留量下降，更多物质以气体形式被释放，说明热解反应更充分，从而验证了在活性炭制备过程中浸渍及活化阶段恒温一段时间的必要性。通过释放成分的化学分析可知，木质素热解产物主要包括CO、CO₂、CH₄、甲醇、丙醛及芳香族化合物等，磷酸浸渍后，木质素热解释放产物含量减少，但成分大致相同。

关键词: 磷酸, 酶解木质素, TG-FTIR-MS

Abstract:

The thermogravimetric analysis of enzymolysis lignin(EL) and phosphoric acid impregnated enzymolysis(EL-P) lignin was carried out at constant heating speed and variable heating speed to simulate the preparation conditions of activated carbon and provide a theoretical basis for analysis. The constant heating speed thermogravimetric experiments found that the EL pyrolysis process mainly occurred at 300-360 ℃, the EL-P pyrolysis temperature was advanced, which proved that phosphoric acid would interact with EL at low temperature. Variable heating speed increased the pyrolysis reaction time of lignin. The main weight loss peaks in the constant-rate heating process of EL split into two weight loss peaks, and the pyrolysis of lignin was more complete. The residual amount of EL-P pyrolysis products was reduced from 57.42% at the constant heating speed to 39.93% at the variable weating speed. Compared with constant speed pyrolysis, variable speed pyrolysis added the constant temperature process, the final pyrolysis residue decreased, more substances were released as gas, which indicated that the pyrolysis reaction was more sufficient. It verified the necessity of holding a constant temperature for a period of time during the impregnation and activation stages of the activated carbon preparation process. The chemical analysis of the released components showed that the pyrolysis of ligin mainly included CO, CO₂, CH₄, methanol, propionaldehyde and aromatic compound and so on. After H₃PO₄ impregnation, the content of pyrolysis products of EL-P reduced and the components were roughly the same.

Key words: phosphoric acid, enzymatic hydrolysis of lignin, TG-FTIR-MS

中图分类号:

TQ35

侯兴隆, 建晓朋, 许伟, 郭奇, 刘军利. 基于TG-FTIR-MS技术的酶解木质素热解行为分析[J]. 林产化学与工业, 2021, 41(6): 36-42.

Xinglong HOU, Xiaopeng JIAN, Wei XU, Qi GUO, Junli LIU. Pyrolysis Behavior Analysis of Enzymolysis Lignin Based on TG-FTIR-MS Technology[J]. Chemistry and Industry of Forest Products, 2021, 41(6): 36-42.

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基于TG-FTIR-MS技术的酶解木质素热解行为分析

Pyrolysis Behavior Analysis of Enzymolysis Lignin Based on TG-FTIR-MS Technology

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