Selective depolymerization β−O−4 linkage of lignin over Pd/C and NaOH

WANG Wen-jin; XU Ying; ZHU Yu-ting; MA Long-long

doi:10.19906/j.cnki.JFCT.2021056

Volume 49 Issue 12

Dec. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(12): 1876-1882

WANG Wen-jin, XU Ying, ZHU Yu-ting, MA Long-long. Selective depolymerization β−O−4 linkage of lignin over Pd/C and NaOH[J]. Journal of Fuel Chemistry and Technology, 2021, 49(12): 1876-1882. doi: 10.19906/j.cnki.JFCT.2021056

Citation:

WANG Wen-jin, XU Ying, ZHU Yu-ting, MA Long-long. Selective depolymerization β−O−4 linkage of lignin over Pd/C and NaOH[J]. Journal of Fuel Chemistry and Technology, 2021, 49(12): 1876-1882. doi: 10.19906/j.cnki.JFCT.2021056

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Selective depolymerization β−O−4 linkage of lignin over Pd/C and NaOH

doi: 10.19906/j.cnki.JFCT.2021056

WANG Wen-jin^{1, 2, 3
,},
XU Ying^{1, 2
,
,},
ZHU Yu-ting^{1, 2, 3},
MA Long-long^{1, 2}

1.
Guangzhou Institute of Energy Conversion, Guangzhou 510640, China
2.
Key Laboratory of Renewable Energy, Guangzhou 510640, China
3.
University of Chinese Academy of Sciences, Beijing 100871, China

Funds: The project was supported by the National Natural Science Foundation of China and the National Research Council of Thailand’s "Renewable Energy" Field Cooperative Research Project (5181101221), the Chinese Academy of Sciences Strategic Leading Science and Technology Project (A) (XDA 21060102) and the Local Innovative Scientific Research Team of the "Pearl River Talent Program" of Guangdong Province Project Grant (2017BT01N092)

Received Date: 2021-03-31
Rev Recd Date: 2021-05-06

Available Online: 2021-06-16

Publish Date: 2021-12-29

Abstract

Abstract

β–O–4 is the most abundant linkage in the lignin structure. It is of great significance to convert lignin into monophenols by breaking the β−O−4 linkage. Therefore, β−O−4 dimer model compound was used as raw materials in this paper. The effects of metal catalysts, temperature, time and hydrogen pressure on the conversion of dimer and yield of monophenols were investigated by GC-MS, GC-FID, HSQC NMR characterization methods. The results show that NaOH and carbon-supported metal catalysts have a synergistic effect which can enhance the breakage of β−O−4 linkage, and the best promotion effect is obtained over Pd/C and NaOH with the monomer yield increases from 44.1% to 83.4%. NaOH and Pd/C can inhibit the removal of C_α−OH of the dimer and enhance the breakage of β−O−4 linkage effectively, leading to the increment in monomers. The NaOH and Pd/C catalytic system also shows excellent performance to the breakage of α−O−4. Under the best conditions, alkali lignin is converted into monophenols over NaOH and Pd/C with the yield of 37.5%, and the selectivity of benzyl alcohol is as high as 48%.
- synergistic effect,
- alkali lignin,
- Pd/C,
- NaOH,
- β−O−4

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References(23)

References

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