Citation: CHANG Guo-zhang, XIE Jian-jun, YANG Hui-kai, HUANG Yan-qin, YIN Xiu-li, WU Chuang-zhi. Structure and pyrolysis characteristics of enzymatic/mild acidolysis lignin isolated from palm kernel shell[J]. Journal of Fuel Chemistry and Technology, ;2016, 44(10): 1185-1194. shu

Structure and pyrolysis characteristics of enzymatic/mild acidolysis lignin isolated from palm kernel shell

1.
CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China

Corresponding author: HUANG Yan-qin, huangyq@ms.giec.ac.cn
Received Date: 11 March 2016
Revised Date: 4 July 2016

Figures(8)

Firstly, lignin of palm kernel shell (PKS) and wheat straw (WS) were isolated by enzymatic/mild acidolysis method (EMAL). Then the functional groups and thermal decomposition characteristics of the two EMALs were analyzed with Fourier transform infrared spectroscopy (FT-IR), pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and TG-FTIR. At last, the Ozawa-Flynn-Wall method was used to calculate the activation energy of pyrolysis of the two EMALs. FT-IR result show that both PKS-EMAL and WS-EMAL are Type HGS. Phenols, acids, few of alcohols, aldehydes and ketones are detected in volatile products from 500℃ pyrolysis of the two EMALs. Meanwhile, H-type, G-type and S-type phenols with proportions of 47.61%, 25.64% and 17.18% are obtained in phenolic products from PKS-EMAL pyrolysis; while they are 23.66%, 51.90% and 15.50%, respectively, in phenolic products of WS-EMAL. During 200-380℃, the main weight loss rate of PKS-EMAL pyrolysis is 50.80%/min, which is obviously lower than that (78.63%/min) of WS-EMAL. A shoulder peak of 27.40%/min at 265℃ is also observed in PKS-EMAL pyrolysis, which is closely related to release of H-derivatives during PKS-EMAL pyrolysis. The activation energy (127.92 kJ/mol) of PKS-EMAL pyrolysis at a conversion of 20% reduced by the exothermic effect corresponding torelease of H-derivatives, which was the main reason that the average activation energy (152.32 kJ/mol) of PKS-EMAL pyrolysis (20%-80%) was lower than that (161.75 kJ/mol) for WS-EMAL pyrolysis.
- palm kernel shell,
- lignin,
- chemical structure,
- pyrolysis,
- activation energy
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