化工学报 ›› 2022, Vol. 73 ›› Issue (3): 1351-1358.DOI: 10.11949/0438-1157.20211355

• 能源和环境工程 • 上一篇    下一篇

纤维素低氧环境下热解特性和糖类生成机制

欧阳志鹏1(),刘庭峰1,冷尔唯2,冯天毅1,曾建辉1,龚勋1()   

  1. 1.华中科技大学煤燃烧国家重点实验室,湖北 武汉 430074
    2.湖南大学机械与运载工程学院,湖南 长沙 410082
  • 收稿日期:2021-09-22 修回日期:2021-11-20 出版日期:2022-03-15 发布日期:2022-03-14
  • 通讯作者: 龚勋
  • 作者简介:欧阳志鹏(1998—),男,硕士研究生,1017666086@qq.com
  • 基金资助:
    国家自然科学基金项目(51776085)

Pyrolysis characteristics and mechanism of carbohydrate formation of cellulose in low oxygen environment

Zhipeng OUYANG1(),Tingfeng LIU1,Erwei LENG2,Tianyi FENG1,Jianhui ZENG1,Xun GONG1()   

  1. 1.State Key Laboratory of Coal Combustion, Huazhong University of Science & Technology, Wuhan 430074, Hubei, China
    2.College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, Hunan, China
  • Received:2021-09-22 Revised:2021-11-20 Online:2022-03-15 Published:2022-03-14
  • Contact: Xun GONG

摘要:

在最小化二次反应的金属网反应器下对微晶纤维素进行低氧热解实验。采用带有脉冲安培检测的高性能阴离子交换色谱法(HPAEC-PAD)的Dionex ICS-6000离子色谱(IC)对热解后的产物水溶性中间态活性纤维素(WSIAC)和水溶性初生焦油(WSPT)的组成和分布进行分析。重点关注纤维素热解过程中几种脱水糖和糖聚物的生成转化规律。实验发现氧气通过促进中间态纤维素的生成来提前纤维素的分解。氧化气氛下,聚合度越高的脱水糖稳定性越差。氧气的存在一方面促进纤维二聚糖和纤维三聚糖生成,另一方面,它们的破碎或其他分解反应也在一定程度下受到氧气影响。

关键词: 生物质, 氧化, 热解, 中间态活性纤维素, 脱水糖

Abstract:

Low oxygen pyrolysis of microcrystalline cellulose was carried out in a metal mesh reactor (WMR) with minimal secondary reaction. The composition and distribution of water-soluble intermediate active cellulose (WSIAC) and water-soluble primary tar (WSPT) were analyzed by Dionex ICS-6000 ion chromatography (IC) using high-performance anion exchange chromatography (HPAEC-PAD) with pulsed amperometric detection. The formation and transformation of several dehydrated sugars and glycopolymers during cellulose pyrolysis was emphasized. It was found that oxygen predates the decomposition of cellulose by promoting the formation of intermediate cellulose. In oxidizing atmosphere, the higher degree of polymerization, the worse the stability of dehydrated sugar. The presence of oxygen promotes the production of cellobiose and cellotrian. On the other hand, their fragmentation or other decomposition reactions are also affected by oxygen to a certain extent.

Key words: biomass, oxidation, pyrolysis, intermediate active cellulose, dehydration of sugar

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