Electrocatalytic Lignin Oxidation

ACS Catalysis ◽  
2021 ◽  
pp. 10104-10114
Author(s):  
Cheng Yang ◽  
Stephen Maldonado ◽  
Corey R. J. Stephenson
Keyword(s):  
Lignin Oxidation

scholarly journals Photocatalytic Pretreatment of Commercial Lignin Using TiO2-ZnO Nanocomposite-Derived Advanced Oxidation Processes for Methane Production Synergy in Lab Scale Continuous Reactors

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 54
Author(s):  
Yu-Ming Chu ◽  
Hafiz Muhammad Asif Javed ◽  
Muhammad Awais ◽  
Muhammad Ijaz Khan ◽  
Sana Shafqat ◽  
...  
Keyword(s):  
Photocatalytic Oxidation ◽  
Advanced Oxidation Processes ◽  
Synergistic Effects ◽  
Oxidation Products ◽  
Methane Yield ◽  
Zno Nanoparticle ◽  
Coumaric Acid ◽  
Stirred Tank Reactors ◽  
Lignin Oxidation ◽  
Constant Operation

The photocatalytic pretreatment of lignocellulosic biomass to oxidize lignin and increase biomass stability has gained attention during the last few years. Conventional pretreatment methods are limited by the fact that they are expensive, non-renewable and contaminate the anaerobic digestate later on. The present study was focused to develop a metal-derived photocatalyst that can work with visible electromagnetic spectra light and oxidize commercial lignin liquor. During this project the advanced photocatalytic oxidation of lignin was achieved by using a quartz cube tungsten T3 Halogen 100 W lamp with a laboratory manufactured TiO2-ZnO nanoparticle (nanocomposite) in a self-designed apparatus. The products of lignin oxidation were confirmed to be vanillic acid (9.71 ± 0.23 mg/L), ferrulic acid (7.34 ± 0.16 mg/L), benzoic acid (6.12 ± 0.17 mg/L) and p-coumaric acid (3.80 ± 0.13 mg/L). These all products corresponded to 85% of the lignin oxidation products that were detectable, which is significantly more than any previously reported lignin pretreatment with even more intensity. Furthermore, all the pretreatment samples were supplemented in the form of feedstock diluent in uniformly operating continuously stirred tank reactors (CSTRs). The results of pretreatment revealed 85% lignin oxidation and later on these products did not hinder the CSTR performance at any stage. Moreover, the synergistic effects of pretreated lignin diluent were seen that resulted in 39% significant increase in the methane yield of the CSTR with constant operation. Finally, the visible light and nanoparticles alone could not pretreat lignin and when used as diluent, halted and reduced the methane yield by 37% during 4th HRT.

scholarly journals Added-Value Chemicals from Lignin Oxidation

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4602
Author(s):  
Carina A. Esteves Costa ◽  
Carlos A. Vega-Aguilar ◽  
Alírio E. Rodrigues
Keyword(s):  
Dicarboxylic Acids ◽  
Added Value ◽  
Comprehensive Overview ◽  
Lignin Valorization ◽  
Cooking Process ◽  
Lignin Oxidation ◽  
H2o2 Oxidation ◽  
Pulp And Paper Industries ◽  
Energy Strategies ◽  
Different Sources

Lignin is the second most abundant component, next to cellulose, in lignocellulosic biomass. Large amounts of this polymer are produced annually in the pulp and paper industries as a coproduct from the cooking process—most of it burned as fuel for energy. Strategies regarding lignin valorization have attracted significant attention over the recent decades due to lignin’s aromatic structure. Oxidative depolymerization allows converting lignin into added-value compounds, as phenolic monomers and/or dicarboxylic acids, which could be an excellent alternative to aromatic petrochemicals. However, the major challenge is to enhance the reactivity and selectivity of the lignin structure towards depolymerization and prevent condensation reactions. This review includes a comprehensive overview of the main contributions of lignin valorization through oxidative depolymerization to produce added-value compounds (vanillin and syringaldehyde) that have been developed over the recent decades in the LSRE group. An evaluation of the valuable products obtained from oxidation in an alkaline medium with oxygen of lignins and liquors from different sources and delignification processes is also provided. A review of C4 dicarboxylic acids obtained from lignin oxidation is also included, emphasizing catalytic conversion by O2 or H2O2 oxidation.

Lignin oxidation by MnO2 under the irradiation of blue light

2019 ◽  
Vol 21 (8) ◽  
pp. 2005-2014 ◽  
Author(s):  
Jinhuo Dai ◽  
Antonio F. Patti ◽  
Gavin N. Styles ◽  
Sepa Nanayakkara ◽  
Leone Spiccia ◽  
...  
Keyword(s):  
Blue Light ◽  
Heterogeneous System ◽  
Lignin Oxidation

We investigated a photocatalytic heterogeneous system using recyclable MnO2 under the irradiation of blue light for lignin oxidation.

Kinetics of Vanillin Production from Kraft Lignin Oxidation

1996 ◽  
Vol 35 (1) ◽  
pp. 28-36 ◽  
Author(s):  
Claire Fargues ◽  
Álvaro Mathias ◽  
Alírio Rodrigues
Keyword(s):  
Kraft Lignin ◽  
Lignin Oxidation ◽  
Kinetics Of

scholarly journals Functional genomic analysis of bacterial lignin degraders: diversity in mechanisms of lignin oxidation and metabolism

2020 ◽  
Vol 104 (8) ◽  
pp. 3305-3320 ◽  
Author(s):  
Rommel Santiago Granja-Travez ◽  
Gabriela Felix Persinoti ◽  
Fabio M. Squina ◽  
Timothy D. H. Bugg
Keyword(s):  
Genomic Analysis ◽  
Functional Genomic ◽  
Functional Genomic Analysis ◽  
Lignin Oxidation

scholarly journals Lignin oxidation and depolymerisation in ionic liquids

2016 ◽  
Vol 18 (3) ◽  
pp. 834-841 ◽  
Author(s):  
R. Prado ◽  
A. Brandt ◽  
X. Erdocia ◽  
J. Hallet ◽  
T. Welton ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Black Liquor ◽  
Lignin Oxidation ◽  
Hydrogen Sulphate

The depolymerisation of lignin directly in the black liquor was studied, comparing two ionic liquids as extracting solvents (butylimidazolium hydrogen sulphate and triethylammonium hydrogen sulphate), under oxidising conditions.

Vanillin production from lignin oxidation in a batch reactor

2010 ◽  
Vol 88 (8) ◽  
pp. 1024-1032 ◽  
Author(s):  
José D.P. Araújo ◽  
Carlos A. Grande ◽  
Alírio E. Rodrigues
Keyword(s):  
Batch Reactor ◽  
Lignin Oxidation
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