The degradation of the lignin in Phyllostachys heterocycla cv. pubescens in an ethanol solvothermal system

Hu, Libin; Luo, Yiping; Cai, Bin; Li, Jianmei; Tong, Dongmei; Hu, Changwei

doi:10.1039/c3gc42489h

Cited by 93 publications

(89 citation statements)

References 40 publications

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“…Less water in ethanol/H 2 O co-solvent led to lower conversion of hemicellulose. In agreement with our previous report36, the presence of ethanol in the system was beneficial to lignin dissolution. When the concentration of ethanol (CE, volume concentration of ethanol in H 2 O) increased from 0 to 0.5, the conversion of lignin increased from 27.5 to 38.6 wt%.…”

Section: Resultssupporting

confidence: 93%

Fractionation for further conversion: from raw corn stover to lactic acid

Jiang

et al. 2016

Sci Rep

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Fractionation is considered to be one promising strategy to utilize raw biomass to its fullest and produce chemicals with high selectivity. Herein, ethanol/H2O (1/1, v/v) co-solvent with 0.050 M oxalic acid is used to simultaneously fractionate 88.0 wt% of hemicellulose and 89.2 wt% of lignin in corn stover, while cellulose is not obviously degraded. H2O dissolves hemicellulose, G unit and those with β-O-4 linkage of lignin; whereas ethanol extracts G and S units as well as the skeleton with β-5 and β-β linkages of lignin. Oxalic acid effectively catalyzes the hydrolysis of hemicellulose and breaks the intermolecular linkages between hemicellulose and lignin, therefore further promotes the release of lignin. The dissolved hemicelluloses derivatives are reprocessed to produce lactic acid obtaining a high yield of 79.6 wt% with 90% selectivity by the catalysis of MgO. The remained cellulose and recovered lignin can be used further as feedstock to produce chemicals.

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Section: Resultssupporting

confidence: 93%

Fractionation for further conversion: from raw corn stover to lactic acid

Jiang

et al. 2016

Sci Rep

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“…After that, the catalyst was calcined in a muffle furnace at 500 °C for 4 h. Prior to the next reaction, hydrogenation treatment would greatly increase, though its hydrogenation products were definitely detected. According to our previous investigations [38], it was found that many lignin oligomers existed in the liquid mixture, since the yield of identified monophenols was less than 10%. Therefore, we speculate that the Pd/γ-Al2O3 catalyst is favorable for the depolymerization of lignin oligomers for producing monophenols, especially 4-ethylphenol under very mild conditions.…”

Section: Recyclability Of the Catalystmentioning

confidence: 99%

“…a The yield of the monophenols from lignin-derived liquid mixture in our previous work [38]; b the yield of monophenols by the hydrogenation of the lignin-derived liquid mixture obtained in our previous work [38]; reactant (0.45 mmol), H 2 O (25 mL), 3 wt. % Pd/γ-Al 2 O 3 (0.200 g, 0.056 mmol Pd), 60˝C, 2 MPa H 2 , 12 h; reaction mixture stirred at 500 rpm; c the hydrogenation products were detected in GC-MS, but not quantified by GC due to the lack of standard substances.…”

Section: 1mentioning

confidence: 99%

“…After that, the catalyst was calcined in a muffle furnace at 500 °C for 4 h. Prior to the next reaction, detected. According to our previous investigations [38]…”

Section: Recyclability Of the Catalystmentioning

confidence: 99%

“…In our previous work [38], a liquid mixture with lignin-derived phenols was obtained from the selective degradation of lignin in pubescens via a two-step process in an ethanol solvent, and 4-ethylphenol was the primary monophenols identified. So we chose the liquid mixture as our reaction substrate for the hydrogenation of monophenols in the raw biomass system.…”

Section: The Hydrogenation Of Phenols Directly From Raw Biomass On Pdmentioning

confidence: 99%

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

Luo

et al. 2016

Catalysts

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Abstract:The catalytic hydrogenation of lignin-derived monophenols with high efficiency and selectivity is important for the sustainable production of chemicals and fuels. Here, Pd/γ-Al 2 O 3 was prepared via impregnation and used as catalyst for the hydrogenation of phenols to cyclohexanols under mild conditions in aqueous solution. 3 wt. % Pd/γ-Al 2 O 3 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˝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/γ-Al 2 O 3 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/γ-Al 2 O 3 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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