Citation: WU Han, WU Kai, ZHANG Hui-yan. Fenton pretreatment of lignin to remove methoxy in pyrolytic bio-oil[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(10): 1186-1192. shu

Fenton pretreatment of lignin to remove methoxy in pyrolytic bio-oil

Key Laboratory of Energy Thermal Conversion and Control Ministry of Education, Southeast University, Nanjing 210096, China

Corresponding author: ZHANG Hui-yan, hyzhang@seu.edu.cn
Received Date: 25 August 2020
Revised Date: 4 October 2020

Fund Project: The project was supported by the National Key Research and Development Program of China (2019YFD1100602), the National Nature Science Fund for Excellent Young Scholar (China)(51822604) and the Nature Science Fund of Jiangsu Province for Distinguished Young Scholar (China) (BK20180014)The Nature Science Fund of Jiangsu Province for Distinguished Young Scholar (China) BK20180014the National Key Research and Development Program of China 2019YFD1100602The National Nature Science Fund for Excellent Young Scholar (China) 51822604

Figures(6)

A Fenton solution with different H₂O₂ concentrations was used to pretreat an alkali lignin (AL), and combined with fast pyrolysis, the change in the content of phenolic compounds containing methoxy group in light bio-oil was explored, also, the influence of the Fenton solution on the structure of the alkali lignin was also studied. The results show that the peak area of phenolic compounds containing methoxy groups in light bio-oil decreases from 7.3×10⁹ with AL (untreated alkali lignin) to 5.2×10⁹ with 13-FML (pretreated alkali lignin with Fenton solution at a concentration of 13 mL/g H₂O₂), decreasing by about 29%. While the peak area of phenolic compounds containing methyl groups and ethyl groups increases from 3.9×10⁹ with AL to 7.2×10⁹ with 13-FML, increasing by about 1.85 times. At the same time, the yield of light bio-oil increases from 22.4% to 28.7%. Through FT-IR, ¹H NMR and ¹³C NMR analysis, it is found that Fenton pretreatment can destroy the condensational structural units of lignin and reduce the content of methoxy, thus providing favorable conditions for subsequent fast pyrolysis to produce bio-oil with low methoxy content.
- lignin,
- fenton pretreatment,
- fast pyrolysis,
- methoxy removal
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