Self-hydrogen transfer hydrogenolysis of β-O-4 linkages in lignin catalyzed by MIL-100(Fe) supported Pd–Ni BMNPs

2017 ◽  
Vol 19 (19) ◽  
pp. 4538-4543 ◽  
Author(s):  
Jia-wei Zhang ◽  
Guo-ping Lu ◽  
Chun Cai
Keyword(s):  
Hydrogen Transfer ◽  
Catalytic Performance ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Organosolv Lignin ◽  
Lignin Model ◽  
Intramolecular Transfer ◽  
Supported Pd

A MIL-100(Fe) supported Pd–Ni BMNP catalyst has been fabricated, and the catalyst exhibits superior catalytic performance toward intramolecular transfer hydrogenolysis of lignin model compounds and organosolv lignin.

Free radical reaction promoted by ionic liquid: a route for metal-free oxidation depolymerization of lignin model compound and lignin

2015 ◽  
Vol 51 (19) ◽  
pp. 4028-4031 ◽  
Author(s):  
Yingying Yang ◽  
Honglei Fan ◽  
Jinliang Song ◽  
Qinglei Meng ◽  
Huacong Zhou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Model Compound ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model Compound ◽  
Organosolv Lignin ◽  
Lignin Model ◽  
Free Oxidation

Ionic liquid can efficiently promote the transformation of lignin model compounds and organosolv lignin.

Removal of Phenolic Hydroxyl Groups in Lignin Model Compounds and Its Effect on Photostability

Holzforschung ◽  
2000 ◽  
Vol 54 (2) ◽  
pp. 127-132 ◽  
Author(s):  
Thomas Q. Hu ◽  
Graham R. Cairns ◽  
Brian R. James
Keyword(s):  
Hydrogen Transfer ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Groups ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Whatman Filter Paper ◽  
Elemental Analyses ◽  
Catalytic Hydrogen ◽  
Lignin Model ◽  
Phenolic Hydroxyl Groups

Summary The phenolic hydroxyl groups in the lignin model compounds, 2-methoxy-4-propylphenol and 4-hydroxy-3-methoxyacetophenone, were removed by first converting the hydroxyl groups to the trifluoromethanesulfonates (triflates) and then cleaving the triflate substituents via catalytic hydrogen transfer. The products, 1-methoxy-3-propylbenzene and 3-methoxyacetophenone, were characterized by 1H and 13C NMR, mass spectrometry and elemental analyses. The effect of the removal of the phenolic groups on the photostability of the model compounds was evaluated by impregnating the compounds into Whatman filter paper sheets, and subjecting them to an accelerated yellowing experiment in a UV chamber. The removal of the phenolic groups resulted in a significant yellowing inhibition, with a higher photostabilizing effect than methylation or acetylation of the hydroxyl, particularly for the model compound without an α-carbonyl group.

scholarly journals Base promoted hydrogenolysis of lignin model compounds and organosolv lignin over metal catalysts in water

2015 ◽  
Vol 123 ◽  
pp. 155-163 ◽  
Author(s):  
Hannelore Konnerth ◽  
Jiaguang Zhang ◽  
Ding Ma ◽  
Martin H.G. Prechtl ◽  
Ning Yan
Keyword(s):  
Metal Catalysts ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Organosolv Lignin ◽  
Lignin Model

Covalent triazine framework catalytic oxidative cleavage of lignin models and organosolv lignin

2018 ◽  
Vol 20 (6) ◽  
pp. 1270-1279 ◽  
Author(s):  
Li Zhao ◽  
Song Shi ◽  
Meng Liu ◽  
Guozhi Zhu ◽  
Min Wang ◽  
...  
Keyword(s):  
Oxidative Cleavage ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Metal Free ◽  
Organosolv Lignin ◽  
Lignin Model ◽  
Covalent Triazine Framework

CTFs were used as effective metal-free catalysts for the oxidative cleavage of lignin model compounds and organosolv lignin.

scholarly journals Activating molecular oxygen with Au/CeO2 for the conversion of lignin model compounds and organosolv lignin

RSC Advances ◽  
2019 ◽  
Vol 9 (53) ◽  
pp. 31070-31077
Author(s):  
Wu-Lin Song ◽  
Qingmeng Dong ◽  
Liang Hong ◽  
Zhou-Qi Tian ◽  
Li-Na Tang ◽  
...  
Keyword(s):  
Molecular Oxygen ◽  
Methyl Alcohol ◽  
High Efficiency ◽  
Model Compounds ◽  
Strong Base ◽  
Lignin Model Compounds ◽  
Organosolv Lignin ◽  
Lignin Model

Au/CeO2 was demonstrated to be a high efficiency catalyst for the conversion of 2-phenoxyacetophenol (PP-ol) employing O2 as an oxidant and methyl alcohol as the solvent without using an erosive strong base or acid.

Visible light-enabled selective depolymerization of oxidized lignin by an organic photocatalyst

2020 ◽  
Vol 56 (76) ◽  
pp. 11243-11246
Author(s):  
Shuyuan Li ◽  
Zhongkai Hao ◽  
Kaixuan Wang ◽  
Min Tong ◽  
Yanan Yang ◽  
...  
Keyword(s):  
Visible Light ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Perylene Diimide ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Efficient Strategy ◽  
Continuous Flow Reactor ◽  
Organosolv Lignin ◽  
Lignin Model

A novel and efficient strategy for the selective depolymerization of lignin model compounds and organosolv lignin via a visible-light-induced photocatalytic continuous-flow reactor was first developed by using perylene diimide (PDI) as a organocatalyst.

Oxidative conversion of lignin and lignin model compounds catalyzed by CeO2-supported Pd nanoparticles

2015 ◽  
Vol 17 (11) ◽  
pp. 5009-5018 ◽  
Author(s):  
Weiping Deng ◽  
Hongxi Zhang ◽  
Xuejiao Wu ◽  
Rongsheng Li ◽  
Qinghong Zhang ◽  
...  
Keyword(s):  
Model Compound ◽  
Pd Nanoparticles ◽  
Oxidative Conversion ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model Compound ◽  
Lignin Model ◽  
Supported Pd

Pd/CeO2 efficiently catalyzes the oxidative conversion of 2-phenoxy-1-phenylethanol, a lignin model compound with a β-O-4 linkage, in methanol, producing monomeric aromatics.

Microwave-assisted fast conversion of lignin model compounds and organosolv lignin over methyltrioxorhenium in ionic liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (103) ◽  
pp. 84967-84973 ◽  
Author(s):  
Bo Zhang ◽  
Changzhi Li ◽  
Tao Dai ◽  
George W. Huber ◽  
Aiqin Wang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Microwave Irradiation ◽  
Reducing Agent ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Microwave Assisted ◽  
Organosolv Lignin ◽  
Lignin Model

Fast depolymerization of β-O-4 model compounds and organosolv lignin to aromatic chemicals over methyltrioxorhenium in ionic liquids without oxidant/reducing agent under microwave irradiation is developed.

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