scholarly journals Selective catalytic degradation of a lignin model compound into phenol over transition metal sulfates

RSC Advances ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 3013-3019
Author(s):  
Min-ya Wu ◽  
Jian-tao Lin ◽  
Zhuang-qin Xu ◽  
Tian-ci Hua ◽  
Yuan-cai Lv ◽  
...  
Keyword(s):  
Transition Metal ◽  
Efficient Method ◽  
Model Compound ◽  
Catalytic Degradation ◽  
Phenyl Ether ◽  
Lignin Model Compound ◽  
Lignin Model ◽  
Benzyl Phenyl Ether

An efficient method for degradation of benzyl phenyl ether using NiSO4·6H2O as catalyst.

Efficient liquid-phase hydrogenolysis of a lignin model compound (benzyl phenyl ether) using a Ni/carbon catalyst

2019 ◽  
Vol 4 (3) ◽  
pp. 618-626 ◽  
Author(s):  
Babasaheb M. Matsagar ◽  
Ting-Cih Kang ◽  
Zheng-Yen Wang ◽  
Takuya Yoshikawa ◽  
Yuta Nakasaka ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Model Compound ◽  
Solvent System ◽  
Phenyl Ether ◽  
Carbon Catalyst ◽  
Lignin Model Compound ◽  
System P ◽  
Lignin Model ◽  
Benzyl Phenyl Ether

Efficient liquid-phase hydrogenolysis of benzyl phenyl ether using Ni/CB in an EtOH/H2O co-solvent system.

Mechanism of Ni-catalyzed selective C O cleavage of lignin model compound benzyl phenyl ether under mild conditions

2019 ◽  
Vol 92 (1) ◽  
pp. 74-81 ◽  
Author(s):  
Chen Zhu ◽  
Jing-Pei Cao ◽  
Xiao-Yan Zhao ◽  
Tao Xie ◽  
Jie Ren ◽  
...  
Keyword(s):  
Model Compound ◽  
Phenyl Ether ◽  
Lignin Model Compound ◽  
Mild Conditions ◽  
Lignin Model ◽  
Benzyl Phenyl Ether

scholarly journals Hydrogenation and cleavage of the C-O bonds in the lignin model compound phenethyl phenyl ether over a nickel-based catalyst

2013 ◽  
Vol 34 (4) ◽  
pp. 651-658 ◽  
Author(s):  
Qi SONG ◽  
Jiaying CAI ◽  
Junjie ZHANG ◽  
Weiqiang YU ◽  
Feng WANG ◽  
...  
Keyword(s):  
Model Compound ◽  
Phenyl Ether ◽  
Lignin Model Compound ◽  
Lignin Model

Free-radical conversion of a lignin model compound catalyzed by Pd/C

2015 ◽  
Vol 17 (8) ◽  
pp. 4452-4458 ◽  
Author(s):  
Honglei Fan ◽  
Yingying Yang ◽  
Jinliang Song ◽  
Qinglei Meng ◽  
Tao Jiang ◽  
...  
Keyword(s):  
Free Radical ◽  
Sodium Carbonate ◽  
Model Compound ◽  
Reaction Pathway ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Lignin Model Compound ◽  
Lignin Model ◽  
Benzyl Phenyl Ether ◽  
Radical Conversion

Benzyl phenyl ether can be decomposed into phenol and toluene effectively by using Pd/C as the catalyst in the presence of sodium carbonate and N-methyl-2-pyrrolidone via a free-radical reaction pathway.

scholarly journals Revisiting the mechanism of β-O-4 bond cleavage during acidolysis of lignin VII: acidolyses of non-phenolic C6-C2-type model compounds using HBr, HCl and H2SO4, and a proposal on the characteristic action of Br− and Cl−

2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Qiaoqiao Ye ◽  
Tomoya Yokoyama
Keyword(s):  
Model Compound ◽  
Bond Cleavage ◽  
Type Model ◽  
Enol Ether ◽  
Lignin Model Compound ◽  
Benzyl Cation ◽  
Acid Type ◽  
Unstable Compound ◽  
Lignin Model ◽  
Acidolysis Reaction

AbstractA non-phenolic C6-C2-type lignin model compound with the β-O-4 bond, 2-(2-methoxyphenoxy)-1-(3,4-dimethoxyphenyl)ethanol (I), was acidolyzed in aqueous 82% 1,4-dioxane containing HBr, HCl, or H2SO4 with a concentration of 0.2 mol/L at 85 ℃ to examine the differences between these acidolyses. Compound I primarily converted to an enol ether compound, 1-(2-methoxyphenoxy)-2-(3,4-dimethoxyphenyl)ethene (II), via the benzyl cation followed by acidolytic β-O-4 bond cleavage regardless of the acid-type, although the disappearance rates of compound I were remarkably different (HBr > HCl >> H2SO4). Acidolyses of compound II using these acids under the same conditions showed a similar tendency, but the rate differences were much smaller than in the acidolyses of compound I. Acidolyses of the α-methyl-etherified derivative of compound I (I-α-OMe) using these acids under the same conditions suggested that the formation rates of the benzyl cation from compound I-α-OMe (also from compound I) are not largely different between the acidolyses using these acids, but those of compound II from the benzyl cation are remarkably different. Acidolysis of the α-bromo-substituting derivative of compound I (I-α-Br) using HBr under the same conditions showed a characteristic action of Br¯ in the acidolysis. Br¯ adds to the benzyl cation generated from compound I or I-α-OMe to afford unstable compound I-α-Br, resulting in acceleration of the formation of compound II and of the whole acidolysis reaction.

scholarly journals Model compounds-based study on adsorption and dispersion properties of lignin-based superplasticizer

2021 ◽  
Vol 104 (1) ◽  
pp. 003685042098062
Author(s):  
Shuangping Ma ◽  
Qingjun Ding ◽  
Fen Zhou ◽  
Huaxiong Zhu
Keyword(s):  
Molecular Structure ◽  
Zeta Potential ◽  
Model Compound ◽  
Research Work ◽  
Structure Activity Relationship ◽  
Activity Relationship ◽  
Lignin Model Compound ◽  
Structure Activity ◽  
Lignin Model ◽  
Relationship Of

The chemical modifications of lignin-based superplasticizers have attracted extensive attentions during recent years. The comprehending of the structure-activity relationship of lignin-based superplasticizer is important to promote the modification and application research of lignin resources. However, lignin features complex and variable molecular structure, which is not conducive to study on structure-activity relationship of lignin-based superplasticizer as well as development and application of new lignin-based superplasticizer. However, the related research work can be simplified by selecting small molecular compound with appropriate molecular structure as the lignin model compound. This article intends to study the structure-activity relationship of lignin-based superplasticizer by using dihydroeugenol as the lignin model compound. Through the substitution of lignin by dihydroeugenol during the synthesis process, a model compound lignin-based superplasticizer (DAFS) was synthesized. The adsorption and dispersion properties of this superplasticizer and reference sample (LAFS) were investigated by fluidity test, Zeta-potential measurement, Total organic carbon analysis and others. The results suggest that the adsorption behavior of both DAFS and LAFS conformed to the Langmuir isotherms and Pseudo-second order kinetic. In cement paste, added with 1 g/L of LAFS and DAFS, Zeta potential were reduced from +3.5 to −15.2 mV and −18.7 mV, respectively. The substitution of lignin by dihydroeugenol has no significantly influence on the dispersive property, but differences on rheological properties which need to be optimized in the future. All the tests confirmed that dihydroeugenol is suitable to replace lignin on exploring the structure-activity relationship of lignin-based superplasticizer. This research work provides new insight on model study of lignin-based superplasticizer.

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