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Title: Effects of lignin structure on hydrodeoxygenation reactivity of pine wood lignin to valuable chemicals

Journal Article · · ACS Sustainable Chemistry & Engineering
 [1];  [1];  [1];  [1];  [2];  [3];  [2];  [1]
  1. Washington State Univ., Pullman, WA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Southwest Research Inst. (SwRI), San Antonio, TX (United States)

Hydrodeoxygenation (HDO) of two dilute acid flow through pretreated softwood lignin samples, including residual lignin in pretreated solid residues (ReL) and recovered insoluble lignin in pretreated liquid (RISL), with apparent different physical and chemical structures, was comprehensively studied. A combination of catalysts (HY zeolite and Ru/Al2O3) was employed to investigate the effects of lignin structures, especially condensed structures, on the HDO upgrading process. Results indicated that the condensed structure and short side chains in lignin hindered its HDO conversion under different reaction conditions, including catalyst loading and composition, hydrogen pressure, and reaction time. In addition to lignin structure, HY zeolite was found crucial for lignin depolymerization, while Ru/Al2O3 and relatively high hydrogen pressure (4 MPa) were necessary for upgrading unstable oxy-compounds to cyclohexanes at high selectivity (>95 wt %). Since the lignin structure essentially affects its reactivity during HDO conversion, the yield and selectivity of HDO products can be predicted by detailed characterization of the lignin structure. Furthermore, the insights gained from this study in the fundamental reaction mechanisms based on the lignin structure will facilitate upgrading of lignin to high-value products for applications in the production of both fuels and chemicals.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1344298
Journal Information:
ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 2 Vol. 5; ISSN 2168-0485
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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Techno‐economic analysis of jet‐fuel production from biorefinery waste lignin journal December 2018
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Effects of Sugars, Furans, and their Derivatives on Hydrodeoxygenation of Biorefinery Lignin‐Rich Wastes to Hydrocarbons journal July 2018
Catalytic Strategies Towards Lignin-Derived Chemicals journal August 2018
Chemicals from lignin: an interplay of lignocellulose fractionation, depolymerisation, and upgrading journal January 2018
State-of-the-art catalytic hydrogenolysis of lignin for the production of aromatic chemicals journal January 2018
Structural Characterization of Lignin and Its Degradation Products with Spectroscopic Methods journal January 2017
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