Insight into pyrolysis of hydrophobic silica aerogels: Kinetics, reaction mechanism and effect on the aerogels

doi:10.1016/j.cjche.2022.10.018

中国化学工程学报 ›› 2023, Vol. 58 ›› Issue (6): 266-281.DOI: 10.1016/j.cjche.2022.10.018

• Full Length Article • 上一篇下一篇

Insight into pyrolysis of hydrophobic silica aerogels: Kinetics, reaction mechanism and effect on the aerogels

Xinyu Liu¹, Hongliang Sheng², Song He¹, Chunhua Du¹, Yuansheng Ma¹, Chichi Ruan¹, Chunxiang He¹, Huaming Dai¹, Yajun Huang³, Yuelei Pan³

1. School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China;
2. Wuhan Building Material Industry Design & Research Institute Co., Ltd, Wuhan 430200, China;
3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, China

收稿日期:2022-06-14 修回日期:2022-10-21 出版日期:2023-06-28 发布日期:2023-08-31
通讯作者: Hongliang Sheng,E-mail:sheng.hl@sinoma-wbmdi.cn;Song He,E-mail:hsong@whut.edu.cn
基金资助:
This research was financially supported by the National Natural Science Foundation of China (52074201 & 51706165) and China Postdoctoral Science Foundation (2021M703082).

Insight into pyrolysis of hydrophobic silica aerogels: Kinetics, reaction mechanism and effect on the aerogels

Xinyu Liu¹, Hongliang Sheng², Song He¹, Chunhua Du¹, Yuansheng Ma¹, Chichi Ruan¹, Chunxiang He¹, Huaming Dai¹, Yajun Huang³, Yuelei Pan³

1. School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan 430070, China;
2. Wuhan Building Material Industry Design & Research Institute Co., Ltd, Wuhan 430200, China;
3. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230027, China

Received:2022-06-14 Revised:2022-10-21 Online:2023-06-28 Published:2023-08-31
Contact: Hongliang Sheng,E-mail:sheng.hl@sinoma-wbmdi.cn;Song He,E-mail:hsong@whut.edu.cn
Supported by:
This research was financially supported by the National Natural Science Foundation of China (52074201 & 51706165) and China Postdoctoral Science Foundation (2021M703082).

摘要/Abstract

摘要： Silica aerogels have promising applications in thermal insulation, but their flammability and reaction mechanisms have rarely been investigated. The pyrolysis kinetics and thermodynamics of hydrophobic silica aerogels under N₂ environment were studied. The kinetic and thermodynamic parameters were obtained by three model-free methods. Based on the calculated kinetic parameters, the pyrolysis mechanism of silica aerogels was discussed by the master plots method. The results indicate that the reactions of the whole pyrolysis phase can be characterized by a random nuclear model. In addition, FTIR test results show that the volatile products of silica aerogel pyrolysis are mainly hydrocarbons generated by the decomposition of hydrophobic groups (methyl groups) on the surface. Finally, the effects of pyrolysis on the properties of silica aerogels Finally, the effects of pyrolysis on the properties of silica aerogels were investigated based on the analysis results of SEM, specific surface area, pore size distribution, X-ray diffraction, XPS and infrared spectroscopy.

关键词: Pyrolysis, Thermodynamics, Reaction kinetics

Abstract: Silica aerogels have promising applications in thermal insulation, but their flammability and reaction mechanisms have rarely been investigated. The pyrolysis kinetics and thermodynamics of hydrophobic silica aerogels under N₂ environment were studied. The kinetic and thermodynamic parameters were obtained by three model-free methods. Based on the calculated kinetic parameters, the pyrolysis mechanism of silica aerogels was discussed by the master plots method. The results indicate that the reactions of the whole pyrolysis phase can be characterized by a random nuclear model. In addition, FTIR test results show that the volatile products of silica aerogel pyrolysis are mainly hydrocarbons generated by the decomposition of hydrophobic groups (methyl groups) on the surface. Finally, the effects of pyrolysis on the properties of silica aerogels Finally, the effects of pyrolysis on the properties of silica aerogels were investigated based on the analysis results of SEM, specific surface area, pore size distribution, X-ray diffraction, XPS and infrared spectroscopy.

Key words: Pyrolysis, Thermodynamics, Reaction kinetics

Xinyu Liu, Hongliang Sheng, Song He, Chunhua Du, Yuansheng Ma, Chichi Ruan, Chunxiang He, Huaming Dai, Yajun Huang, Yuelei Pan. Insight into pyrolysis of hydrophobic silica aerogels: Kinetics, reaction mechanism and effect on the aerogels[J]. 中国化学工程学报, 2023, 58(6): 266-281.

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Insight into pyrolysis of hydrophobic silica aerogels: Kinetics, reaction mechanism and effect on the aerogels

Insight into pyrolysis of hydrophobic silica aerogels: Kinetics, reaction mechanism and effect on the aerogels

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