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Title: Quenching of reactive intermediates during mechanochemical depolymerization of lignin

Journal Article · · Catalysis Today
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  1. Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Mechanochemical reactions are performed to depolymerize organosolv lignin with sodium hydroxide in a mixer ball mill. GPC analysis reveals that rapid depolymerization into small oligomers occurs within minutes of milling time, followed by a slower reduction in average relative molecular mass over the next 8 h of milling. Monomeric products are identified by GC–MS and quantified by GC-FID. The extent of depolymerization appears to be limited by repolymerization reactions that form bonds between products. Suppression of these repolymerization reactions can be achieved through the addition of methanol as a scavenger or adjustment of the moisture content of the feedstock. These modifications result in lower average relative molecular masses and higher yields of monomers. These results are an important step towards designing an efficient pathway for lignin valorization.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830; AC06-76RLO-1830
OSTI ID:
1364389
Alternate ID(s):
OSTI ID: 1550039
Report Number(s):
PNNL-SA-120623; PII: S0920586117302997
Journal Information:
Catalysis Today, Vol. 302; ISSN 0920-5861
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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  • Rodrigues Pinto, Paula C.; Borges da Silva, Eduardo A.; Rodrigues, Alírio Egídio
  • Industrial & Engineering Chemistry Research, Vol. 50, Issue 2 https://doi.org/10.1021/ie102132a
journal January 2011
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Cited By (7)

Kinematic Modeling of Mechanocatalytic Depolymerization of α-Cellulose and Beechwood journal January 2018
Alternatives for Chemical and Biochemical Lignin Valorization: Hot Topics from a Bibliometric Analysis of the Research Published During the 2000–2016 Period journal July 2018
Analysis of gas chromatography/mass spectrometry data for catalytic lignin depolymerization using positive matrix factorization journal January 2018
From Synthesis of Amino Acids and Peptides to Enzymatic Catalysis: A Bottom-Up Approach in Mechanochemistry journal March 2018
Recent Efforts to Prevent Undesirable Reactions From Fractionation to Depolymerization of Lignin: Toward Maximizing the Value From Lignin journal September 2018
Kinematic Modeling of Mechanocatalytic Depolymerization of α‐Cellulose and Beechwood journal February 2018
Effects of Process Parameters on Hydrolytic Treatment of Black Liquor for the Production of Low-Molecular-Weight Depolymerized Kraft Lignin journal September 2018