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Catalytic hydrogenolysis of ethanol organosolv lignin

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Published/Copyright: June 29, 2009
Holzforschung
From the journal Volume 63 Issue 5

Abstract

The production of ethanol based on lignocellulosic materials will bring about the coproduction of significant amounts of under-utilized lignin. This study examines the potential of conventional heterogeneous and novel homogeneous catalysts for the selective cleavage of the aryl-O-aryl and aryl-O-aliphatic linkages of ethanol organosolv lignin to convert it from a low grade fuel to potential fuel precursors or other value added chemicals. The development of hydrogenolysis conditions that effectively increase the solubility of lignin were initially examined with Ru(Cl)2(PPh3)3 and demonstrated the ability to decrease the molecular weight and enhance the solubility of the lignin polymer. Later studies examined several heterogeneous and homogeneous hydrogenation catalysts at optimized reaction conditions resulting in 96.4% solubility with Ru(Cl)2(PPh3)3, increase in H/C ratio with Raney-Ni, Pt/C and extensive monomer formation with NaBH4/I2. The changes in molecular structure of lignin were followed by size exclusion chromatography, qualitative and quantitative NMR spectroscopy and elemental analysis. These studies demonstrated that aryl-O-aryl and aryl-O-aliphatic linkages could be cleaved and the hydrogenated lignin had a decrease in oxygen functionality and the formation of products with lower oxygen content.

Keywords: hydrogenation; hydrogenolysis; lignocellulose matrix; 1H NMR spectroscopy; 31P NMR spectroscopy; size exclusion chromatography
Corresponding author. Institute of Paper Science and Technology, Georgia Institute of Technology, 500 10th St. NW, Atlanta, GA, 30332, USA Phone: +1-404-894-9701 Fax:+1-404-894-4778
Received: 2009-1-20
Accepted: 2009-4-30
Published Online: 2009-06-29
Published Online: 2009-06-29
Published in Print: 2009-09-01

©2009 by Walter de Gruyter Berlin New York

Articles in the same Issue

  1. Original Papers
  2. Orientation of the wood polymers in the cell wall of spruce wood fibres
  3. MEA/water/AQ-pulping of wheat straw
  4. Catalytic hydrogenolysis of ethanol organosolv lignin
  5. The influence of mannanase and endoglucanase treatment on the fibre stability of spruce CTMP
  6. TEMPO-mediated oxidation of softwood thermomechanical pulp
  7. Ozone pretreatment of lignocellulosic materials for ethanol production: Improvement of enzymatic susceptibility of softwood
  8. A preliminary study of green production of fiberboard bonded with tannin and laccase in a wet process
  9. Extractives in bark of different conifer species growing in Pakistan
  10. Chelating and antioxidant activity of lignans from Chilean woods (Cupressaceae)
  11. Effect of surface modification of beech wood flour on mechanical and thermal properties of poly (3-hydroxybutyrate)/wood flour composites
  12. Microwave radar for detection of resin defects in Pinus elliottii Engelm var elliottii
  13. Reconstruction of 3D images of internal log characteristics by means of successive 2D log computed tomography images
  14. Synchrotron X-ray microtomography and 3D image analysis of medium density fiberboard (MDF)
  15. Non-destructive determination and quantification of diffusion processes in wood by means of neutron imaging
  16. Application of the end loaded split and single-leg bending tests to the mixed-mode fracture characterization of wood
  17. Poisson's ratio of plywood measured by tension test
  18. Characterizing hydro-thermal compression behavior of aspen wood strands
  19. Decay resistance of acetylated and hexanoylated hardwood and softwood species exposed to Coniophora puteana
  20. Chemical improvement of surfaces. Part 1: Novel functional modification of wood with covalently bound organoboron compounds
  21. Primary and secondary decay fungi on exposed pine tree logs in the forest
  22. Resistance of thermo-hygro-mechanically (THM) densified wood to degradation by white rot fungi
  23. Meetings
  24. Meetings
https://doi.org/10.1515/HF.2009.097
Keywords for this article
hydrogenation; hydrogenolysis; lignocellulose matrix; 1H NMR spectroscopy; 31P NMR spectroscopy; size exclusion chromatography

Articles in the same Issue

  1. Original Papers
  2. Orientation of the wood polymers in the cell wall of spruce wood fibres
  3. MEA/water/AQ-pulping of wheat straw
  4. Catalytic hydrogenolysis of ethanol organosolv lignin
  5. The influence of mannanase and endoglucanase treatment on the fibre stability of spruce CTMP
  6. TEMPO-mediated oxidation of softwood thermomechanical pulp
  7. Ozone pretreatment of lignocellulosic materials for ethanol production: Improvement of enzymatic susceptibility of softwood
  8. A preliminary study of green production of fiberboard bonded with tannin and laccase in a wet process
  9. Extractives in bark of different conifer species growing in Pakistan
  10. Chelating and antioxidant activity of lignans from Chilean woods (Cupressaceae)
  11. Effect of surface modification of beech wood flour on mechanical and thermal properties of poly (3-hydroxybutyrate)/wood flour composites
  12. Microwave radar for detection of resin defects in Pinus elliottii Engelm var elliottii
  13. Reconstruction of 3D images of internal log characteristics by means of successive 2D log computed tomography images
  14. Synchrotron X-ray microtomography and 3D image analysis of medium density fiberboard (MDF)
  15. Non-destructive determination and quantification of diffusion processes in wood by means of neutron imaging
  16. Application of the end loaded split and single-leg bending tests to the mixed-mode fracture characterization of wood
  17. Poisson's ratio of plywood measured by tension test
  18. Characterizing hydro-thermal compression behavior of aspen wood strands
  19. Decay resistance of acetylated and hexanoylated hardwood and softwood species exposed to Coniophora puteana
  20. Chemical improvement of surfaces. Part 1: Novel functional modification of wood with covalently bound organoboron compounds
  21. Primary and secondary decay fungi on exposed pine tree logs in the forest
  22. Resistance of thermo-hygro-mechanically (THM) densified wood to degradation by white rot fungi
  23. Meetings
  24. Meetings
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