期刊
ACS CATALYSIS
卷 10, 期 24, 页码 15197-15206出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c03170
关键词
lignin; 4-alkylphenols; hydrogen-free; self-reforming-driven; hydrogenolysis
资金
- NSFC of China [21832002, 22072041, 21872050, 21808063]
- Fundamental Research Funds for the Central Universities [222201718003]
- Science and Technology Commission of Shanghai Municipality [18ZR1408500, 10dz2220500]
Lignin is constructed from methoxylated phenylpropanoid with plenty of hydroxys and methoxys. Its conversion to valuable products is extremely attractive but especially challenging without additional hydrogen sources. Herein we report a hydrogen-free production of 4-alkylphenols directly from native lignin via self-reforming-driven depolymerization and hydrogenolysis over Pt/NiAl2O4. This is the first example of acquiring 4-alkylphenols from native lignin. Using this strategy, high yields of 4-alkylphenols, 17.3 wt %, were obtained from birch lignin. Reaction pathway and mechanism studies revealed that this strategy initiates from the reforming of aliphatic hydroxys, followed by the cleavage of C-O linkages, and ends via demethoxylation over Pt/NiAl2O4. Moreover, the subsequent aqueous phase reforming of the as-formed methanol accelerates the whole process. This strategy realizes the one-pot production of 4-alkylphenols from lignin by fully utilizing the structural hydrogen in lignin and H2O, providing a low-cost and safe method of lignin valorization.
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