Kinetic Studies of Lignin Solvolysis and Reduction by Reductive Catalytic Fractionation Decoupled in Flow-Through Reactors
Abstract
Reductive catalytic fractionation (RCF) is an effective active-stabilization strategy to selectively extract and depolymerize lignin into aromatic monomers. Here, the kinetics of RCF were investigated by using flow-through reactors to decouple the two limiting mechanistic steps, namely lignin solvolysis and reduction. When operating in a solvolysis-limited regime, apparent energy barriers of 63 ± 1 and 64 ± 2 kJ mol–1 were measured for the solvent mediated lignin extraction of poplar using particle diameters of 0.5 < d < 1 mm and 0.075 < d < 0.25 mm, respectively. In contrast, when using mechanically stirred batch reactors, apparent barriers of 32 ± 1 and 39 ± 3 kJ mol–1 were measured for particle diameters of 0.5 < d < 1 mm and 0.075 < d < 0.25 mm, respectively. The difference of activation barriers between flow and batch reactors indicated that lignin extraction under typical RCF conditions in a 100 mL batch reactor stirred at 700 rpm was mass-transfer limited. In the reduction-limited regime, cleavage of the β-O-4 bond in a model compound exhibited an apparent activation barrier of 168 ± 14 kJ mol–1. This study demonstrates RCF occurs by two limiting processes that can be independently controlled. Furthermore, both controllingmore »
- Authors:
-
- Chemical Engineering, Massachusetts Institute of Technology, 25 Ames Street, Cambridge, Massachusetts 02139, United States
- National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, Colorado 80401, United States
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Bioenergy Technologies Office; National Science Foundation (NSF)
- OSTI Identifier:
- 1436364
- Alternate Identifier(s):
- OSTI ID: 1462319; OSTI ID: 1508813
- Report Number(s):
- NREL/JA-2A00-72048
Journal ID: ISSN 2168-0485
- Grant/Contract Number:
- AC36?08GO28308; AC36-08GO28308; 1454299
- Resource Type:
- Published Article
- Journal Name:
- ACS Sustainable Chemistry & Engineering
- Additional Journal Information:
- Journal Name: ACS Sustainable Chemistry & Engineering Journal Volume: 6 Journal Issue: 6; Journal ID: ISSN 2168-0485
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 09 BIOMASS FUELS; biomass pretreatment; flow-through extraction; lignin conversion; lignin first; lignin kinetics; reductive catalysis; semicontinuous processing
Citation Formats
Anderson, Eric M., Stone, Michael L., Hülsey, Max J., Beckham, Gregg T., and Román-Leshkov, Yuriy. Kinetic Studies of Lignin Solvolysis and Reduction by Reductive Catalytic Fractionation Decoupled in Flow-Through Reactors. United States: N. p., 2018.
Web. doi:10.1021/acssuschemeng.8b01256.
Anderson, Eric M., Stone, Michael L., Hülsey, Max J., Beckham, Gregg T., & Román-Leshkov, Yuriy. Kinetic Studies of Lignin Solvolysis and Reduction by Reductive Catalytic Fractionation Decoupled in Flow-Through Reactors. United States. https://doi.org/10.1021/acssuschemeng.8b01256
Anderson, Eric M., Stone, Michael L., Hülsey, Max J., Beckham, Gregg T., and Román-Leshkov, Yuriy. Tue .
"Kinetic Studies of Lignin Solvolysis and Reduction by Reductive Catalytic Fractionation Decoupled in Flow-Through Reactors". United States. https://doi.org/10.1021/acssuschemeng.8b01256.
@article{osti_1436364,
title = {Kinetic Studies of Lignin Solvolysis and Reduction by Reductive Catalytic Fractionation Decoupled in Flow-Through Reactors},
author = {Anderson, Eric M. and Stone, Michael L. and Hülsey, Max J. and Beckham, Gregg T. and Román-Leshkov, Yuriy},
abstractNote = {Reductive catalytic fractionation (RCF) is an effective active-stabilization strategy to selectively extract and depolymerize lignin into aromatic monomers. Here, the kinetics of RCF were investigated by using flow-through reactors to decouple the two limiting mechanistic steps, namely lignin solvolysis and reduction. When operating in a solvolysis-limited regime, apparent energy barriers of 63 ± 1 and 64 ± 2 kJ mol–1 were measured for the solvent mediated lignin extraction of poplar using particle diameters of 0.5 < d < 1 mm and 0.075 < d < 0.25 mm, respectively. In contrast, when using mechanically stirred batch reactors, apparent barriers of 32 ± 1 and 39 ± 3 kJ mol–1 were measured for particle diameters of 0.5 < d < 1 mm and 0.075 < d < 0.25 mm, respectively. The difference of activation barriers between flow and batch reactors indicated that lignin extraction under typical RCF conditions in a 100 mL batch reactor stirred at 700 rpm was mass-transfer limited. In the reduction-limited regime, cleavage of the β-O-4 bond in a model compound exhibited an apparent activation barrier of 168 ± 14 kJ mol–1. This study demonstrates RCF occurs by two limiting processes that can be independently controlled. Furthermore, both controlling which process limits RCF and verifying if transport limitations exist, are critical steps to develop a mechanistic understanding of RCF and to design improved catalysts.},
doi = {10.1021/acssuschemeng.8b01256},
journal = {ACS Sustainable Chemistry & Engineering},
number = 6,
volume = 6,
place = {United States},
year = {2018},
month = {4}
}
https://doi.org/10.1021/acssuschemeng.8b01256
Web of Science
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