Evolvement behavior of microstructure and H2O adsorption of lignite pyrolysis
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- 作者：Yingyue Teng ; Shijun Lian ; Quansheng Liu ; liuqs@imut.edu.cn" class="auth_mail" title="E-mail the corresponding author ; Yuzhe Liu ; Yinmin Song ; Runxia He ; Keduan Zhi
- 关键词：Lignite ; Pore structure ; Moisture adsorption ; Oxygen-containing Groups
- 刊名：Chinese Journal of Chemical Engineering
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：24
- 期：6
- 页码：803-810
- 全文大小：2122 K
文摘
The effect of pyrolysis on the microstructure and moisture adsorption of lignite was investigated with low field nuclear magnetic resonance spectroscopy. Changes in oxygen-containing groups were analyzed by Fourier transform infrared spectroscopy (FTIR), and H2O adsorption mechanism on the surface of lignite pyrolysis was inferred. Two major changes in the pore structure of lignite char were observed as temperature increased in 105–200 °C and 500–700 °C. Pyrolysis temperature is a significant factor in removing carboxyl and phenolic hydroxyl from lignite. Variation of ether bond content can be divided into three stages; the content initially increased, then decreased, and finally increased. The equilibrium adsorption ratio, content of oxygen-containing groups, and variation of pore volume below 700° were closely correlated with each other. The amount of adsorbed water on char pyrolyzed at 700 °C increased. Moreover, the adsorption capacity of the lignite decreased, and the adsorption state changed.