High Efficient Hydrogenation of Lignin-Derived Monophenols to Cyclohexanols over Pd/γ-Al2O3 under Mild Conditions

被引:29
作者
Yi, Jian [1 ]
Luo, Yiping [1 ]
He, Ting [1 ]
Jiang, Zhicheng [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
关键词
4-ethylphenol; lignin; hydrogenation; 4-ethylcyclohexanol; Pd; -Al2O3; catalyst; SUPPORTED PALLADIUM CATALYSTS; SUPERCRITICAL CARBON-DIOXIDE; VAPOR-PHASE HYDROGENATION; PHENOL HYDROGENATION; AQUEOUS-PHASE; SELECTIVE HYDROGENATION; ACTIVATED CARBON; HYDRODEOXYGENATION; GUAIACOL; DEPOLYMERIZATION;
D O I
10.3390/catal6010012
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The catalytic hydrogenation of lignin-derived monophenols with high efficiency and selectivity is important for the sustainable production of chemicals and fuels. Here, Pd/-Al2O3 was prepared via impregnation and used as catalyst for the hydrogenation of phenols to cyclohexanols under mild conditions in aqueous solution. 3 wt. % Pd/-Al2O3 exhibited good catalytic activity for the selective hydrogenation of 4-ethylphenol into 4-ethylcyclohexanol, and a conversion of 100% with selectivity of 98.9% was achieved at 60 degrees C for 12 h. Other lignin-derived monophenolic model compounds such as 4-methyl phenol and 4-propyl phenol could be hydrogenated into cyclohexanols selectively under optimal conditions. Moreover, the Pd/-Al2O3 catalyst displayed good activity for the hydrogenation of the mixture of monophenols directly derived from raw biomass system to cyclohexanols as the main products, and was favorable for the depolymerization of lignin oligomers under milder conditions. Pd/-Al2O3 catalyst showed good water resistance and stability after recycling four times. This result might provide a promising approach to selectively producing cyclohexanol directly from raw biomass material under mild conditions in aqueous solutions.
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页数:13
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