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Pyrolysis-assisted Catalytic Hydrogenolysis of Lignin in Solvents for Aromatic Monomer Preparation

ワン, ジャキ 京都大学 DOI:10.14989/doctor.k24712

2023.03.23

概要

1.1 Global energy and environmental issues caused by the use of fossil resources.................................. 1
1.2 The role of biomass as alternative to fossil resources ......................................................................... 2
1.3 Lignocellulosic biomass...................................................................................................................... 4
1.4 Chemical constituents of cell walls of lignocellulosic biomass .......................................................... 7
1.4.1 Cellulose ...................................................................................................................................... 7
1.4.2 Hemicellulose .............................................................................................................................. 8
1.4.3 Lignin ......................................................................................................................................... 10
1.4.4 Architecture of cell wall ............................................................................................................. 13
1.5 Isolation of lignin .............................................................................................................................. 15
1.6 Technically available lignin .............................................................................................................. 16
1.6.1 Kraft lignin ................................................................................................................................. 17
1.6.2 Organosolv lignin....................................................................................................................... 18
1.6.3 Other technical lignins ............................................................................................................... 18
1.6.4 Potential market of technical lignins .......................................................................................... 19
1.7 Chemical approaches for lignin depolymerization ........................................................................... 20
1.7.1 Pyrolysis..................................................................................................................................... 21
1.7.1.1 Homolysis and heterolysis ............................................................................... 21
1.7.1.2 Pyrolytic depolymerization of lignin................................................................. 23
1.7.1.3 Side-chain and OCH3 transformation ................................................................ 23
1.7.1.4 Re-condensation ............................................................................................. 24
1.7.2 Thermal depolymerization in solvents ....................................................................................... 24
1.7.3 Reductive catalytic depolymerization ........................................................................................ 26
1.8 Objectives of this thesis .................................................................................................................... ...

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参考文献

Original papers

1.

J. Wang, E. Minai, H. Kawamoto (2022) Stable Oligomer Formation from Lignin by

Pyrolysis of Softwood in an Aprotic Solvent with a Hydrogen Donor. ChemistryOpen,

11(9), e202200104 (Highlight)

2.

J. Wang, E. Minami and H. Kawamoto (2023) Pyrolysis-assisted hydrogenolysis of

softwood lignin at elevated temperatures for the high yield production of monomers. Green

Chemistry, 2023, DOI: 10.1039/D2GC03719J. (Front cover)

3.

J. Wang, E. Minami and H. Kawamoto (2023) Role of pyrolysis in pyrolysis-assisted

catalytic hydrogenolysis of lignin and mechanistic insights into catalytic conversion.

Journal of Analytic and Applied Pyrolysis. (in press)

4.

J. Wang, E. Minami and H. Kawamoto (2023) Effects of solvent on pyrolysis-assisted

catalytic hydrogenolysis of softwood lignin for high-yield production of monomers and

phenols. ChemSusChem. (under review)

5.

J. Wang, E. Minami and H. Kawamoto (2023) Naphthalene formation behavior from

pinoresinol in the pyrolysis-assisted hydrogenolysis. (in preparation)

Conferences and symposiums

1.

2.

3.

4.

J. Wang, H. Kawamoto. (2018) Pyrolytic degradation of lignin in wood in the presence

of hydrogen donor and aromatic solvent. Oral, The 63rd Lignin Symposium. Nov 1-2,

Koganei, Tokyo.

J. Wang, H. Kawamoto. (2019) Influences of pyrolysis temperature on formation of

lignin- and polysaccharide-derived products from softwood in the presence of H-donor

and aromatic solvent. Oral, The 69th Annual Meeting of the japan wood research

society. March 14-16, Hakodate.

J. Wang, E. Minami, H. Kawamoto. (2020) Pyrolysis of Japanese cedar wood in toluene

and ethylbenzene. Oral, The 70th Annual Meeting of the japan wood research society.

March 16-18, Tottori.

J. Wang, E. Minami, H. Kawamoto. (2021) Cell Wall Effects in Pyrolysis of Lignin in

Cedar Wood. Oral, The 71st Annual Meeting of the japan wood research society. March

19-21, Tokyo. Online

134

5.

6.

7.

8.

J. Wang, E. Minami, H. (2021) Kawamoto. Catalytic pyrolysis of softwood lignin in sol

vent at elevated temperatures to cleave condensed linkages for high-yield monomer prep

aration. Oral, the 66th Lignin Symposium. Nov 4-5, Online.

J. Wang, E. Minami, H. Kawamoto. (2022) Thermocatalytic Hydrogenolysis of Japanes

e Cedar Lignin to Monomers. Poster, The 21st International Symposium on Wood, Fiber

and Pulping Chemistry. March 7-10, Raleigh, USA. (canceled)

J. Wang, E. Minami, H. Kawamoto. (2022) Role of pyrolysis in thermocatalytical

hydrogenolysis of lignin. Oral, The 72th Annual Meeting of the japan wood research

society. March 15-17, Nagoya. Online

J. Wang, E. Minami, H. Kawamoto. (2022) Role of pyrolysis on the product

composition in thermocatalytic hydrogenolysis of lignin. Oral, The 67th Lignin

Symposium. Nov 10-11, Online.

Awards

1.

Best Student Oral Presentation Award. 71st Annual Meeting of the Japan Wood Research

Society. March 19-21 (2021), Tokyo (online)

135

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