共 66 条
Catalytic depolymerization of organosolv lignin to phenolic monomers and low molecular weight oligomers
被引:91
作者:
Liu, Xudong
[1
]
Jiang, Zhicheng
[2
]
Feng, Shanshan
[1
]
Zhang, Hui
[1
]
Li, Jianmei
[1
]
Hu, Changwei
[1
]
机构:
[1] Sichuan Univ, Coll Chem, Key Lab Green Chem & Technol, Minist Educ, Chengdu 610064, Sichuan, Peoples R China
[2] Sichuan Univ, Natl Engn Lab Clean Technol Leather Mfg, Chengdu 610064, Sichuan, Peoples R China
来源:
基金:
中国国家自然科学基金;
关键词:
Lignin;
Solvolytic fractionation;
Catalytic depolymerization;
Phenolic monomers;
Oligomers;
BIOMASS FRACTIONATION;
PLANT BIOMASS;
REDUCTIVE DEPOLYMERIZATION;
CORNCOB RESIDUE;
KRAFT LIGNIN;
HIGH-YIELD;
BIO-OIL;
CONVERSION;
ACID;
HYDROGENOLYSIS;
D O I:
10.1016/j.fuel.2019.01.117
中图分类号:
TE [石油、天然气工业];
TK [能源与动力工程];
学科分类号:
0807 ;
0820 ;
摘要:
The lignin-first strategy provides significant potential for producing value-added phenolics and high-quality biofuels. In this contribution, stepwise extraction and depolymerization of lignin in corncob residue towards the production of phenolic monomers, lignin-derived dimers and trimers was investigated. H2O/n-butanol (4:6, v/v) co-solvent could extract 87.1% of lignin in corncob residue, retaining a high-purity (86.0%) cellulose pulp. Ni/HZSM-5 catalysts with different Ni loadings were prepared and applied for further degradation of organosolv lignin. Over 5% Ni/HZSM-5, the highest yield of phenolic monomer was 19.5% with the selectivity of 66.7% towards 4-ethyl phenols (4-ethyl phenol and 4-ethyl guaiacol) at 300 degrees C, and liquid products with higher heating value (HHV) of 29.2 MJ kg(-1) were obtained. The 5% Ni/HZSM-5 catalyst promoted the cleavage of intramolecular beta-O-4 and C-beta-C-gamma. linkages, resulting in substantially decreased weight-average molecular weight (M-w)/number-average molecular weight (M-n) of the organosolv lignin from 2541/1064 Da to 562/391 Da, which implied the degradation of high-Mw oligomers to dimers and trimers. The catalyst also contributed to the hydrogenation of C-alpha = C-beta bonds in unsaturated intermediates (coniferyl alcohol and coumaryl alcohol). The possible cleavage mechanism for the degradation of lignin-derived oligomers was also proposed.
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页码:247 / 257
页数:11
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