Catalytic hydrogenolysis of alkali lignin in supercritical ethanol over copper monometallic catalyst supported on a chromium-based metal–organic framework for the efficient production of aromatic monomers

Tran, My Ha; Phan, Dieu Phuong; Kim, Han Bom; Park, Eun Duck; Lee, Eun Yeol

doi:10.1016/j.biortech.2021.125941

Cited by 21 publications

(8 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous studies on lignin depolymerization, most of lignin was converted into phenolic products under the presence of catalysts. 55,73,74 However, in this study, 60−70% of phenolic products could be obtained from lignin without any catalyst at 12 h (Figure S15). However, depolymerizing lignin into cyclohexanol-based chemicals is challenging.…”

Section: Catalyst Reusabilitymentioning

confidence: 64%

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO₂-Doped Carbon-Supported Nickel-Based Catalyst

Xie,

Zhao,

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

In this study, a CeO 2 -doped carbon-supported nickel-based catalyst (Ni/XCeO 2 −C−Y) was synthesized and applied to the catalytic depolymerization of lignin and its derivatives. The variations in CeO 2 content and calcination temperature are observed to cause a notable impact on the existence of oxygen vacancies. The results demonstrated that an optimal Ni/20%CeO 2 − C-500 exhibited excellent effectiveness in the cleavage of the β-O-4 bond to ethylbenzene and cyclohexanol at 180 °C and 1 MPa N 2 . In this system, isopropanol is used as a hydrogen-donating solvent as it can produce H 2 (detected by GC) during the reaction. The successful doping of CeO 2 onto carbon contributes to the formation of an interaction between the carrier and nickel, causing a more uniform dispersion of metallic Ni. In addition, the selectivity of phenols in the real lignin depolymerization decreased from noncatalytic 71.5 to 25.4%, and most of the phenols were well converted into cyclohexanols and ketones. The reusability experiments revealed that Ni/20%CeO 2 −C-500 possessed excellent recycling and regeneration properties.

show abstract

Section: Catalyst Reusabilitymentioning

confidence: 64%

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO₂-Doped Carbon-Supported Nickel-Based Catalyst

Xie,

Zhao,

et al. 2024

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Also, to maximize the efficiency of monomeric yield, normal solvents were replaced with super critical solvents. For instance, alkali lignin in super critical ethanol was catalytically added with hydrogen in the presence of copper monometallic catalyst supported on a chromium-based metal organic framework ( Tran et al, 2021 ). The depolymerized products mainly composed of G-type monomers which act as the favourable feedstock for microbial bioconversion.…”

Section: Methods Of Lignin Depolymerizationmentioning

confidence: 99%

Endophytes in Lignin Valorization: A Novel Approach

Mattoo

Nonzom

2022

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

Lignin, one of the essential components of lignocellulosic biomass, comprises an abundant renewable aromatic resource on the planet earth. Although 15%––40% of lignocellulose pertains to lignin, its annual valorization rate is less than 2% which raises the concern to harness and/or develop effective technologies for its valorization. The basic hindrance lies in the structural heterogeneity, complexity, and stability of lignin that collectively makes it difficult to depolymerize and yield common products. Recently, microbial delignification, an eco-friendly and cheaper technique, has attracted the attention due to the diverse metabolisms of microbes that can channelize multiple lignin-based products into specific target compounds. Also, endophytes, a fascinating group of microbes residing asymptomatically within the plant tissues, exhibit marvellous lignin deconstruction potential. Apart from novel sources for potent and stable ligninases, endophytes share immense ability of depolymerizing lignin into desired valuable products. Despite their efficacy, ligninolytic studies on endophytes are meagre with incomplete understanding of the pathways involved at the molecular level. In the recent years, improvement of thermochemical methods has received much attention, however, we lagged in exploring the novel microbial groups for their delignification efficiency and optimization of this ability. This review summarizes the currently available knowledge about endophytic delignification potential with special emphasis on underlying mechanism of biological funnelling for the production of valuable products. It also highlights the recent advancements in developing the most intriguing methods to depolymerize lignin. Comparative account of thermochemical and biological techniques is accentuated with special emphasis on biological/microbial degradation. Exploring potent biological agents for delignification and focussing on the basic challenges in enhancing lignin valorization and overcoming them could make this renewable resource a promising tool to accomplish Sustainable Development Goals (SDG’s) which are supposed to be achieved by 2030.

show abstract

“…Although the above processes have shown that the hydrogenation activity of lignin will be reduced after chemical reaction or treatment, the main source of lignin at present is the black liquor produced by pulp and paper factories. In order to investigate the hydrogenation activity of alkali lignin, Tran et al (2021) used commercial alkali lignin for hydrogenation degradation experiment. They designed and prepared catalyst Cu@MIL-101(Cr), and optimized the reaction temperature, catalyst load and substrate concentration in the reaction.…”

Section: Hydrogenated Degradation Using Hydrogen Molecules To Supply ...mentioning

confidence: 99%

Catalytic hydrogenolysis lignin to obtain phenols: A review of selective cleavage of ether bonds

2023

BioRes

View full text Add to dashboard Cite

Lignin depolymerized phenolic compounds and biofuel precursors are ideal value-added products for lignin residues generated in biorefineries and modern paper pulp facilities. Hydrogenolysis of lignin is an efficient depolymerization method for the production of carbon-neutral sustainable fuels and platform chemicals. Lignin is underutilized due to its complex structure, mainly because of its complex interunit linkage crosslinks such as α-O-4, β-O-4, 4-O-5, and β-5. This paper centers on the hydrolysis reaction of three major ether bonds (α-O-4, β-O-4, 4-O-5) in lignin and lignin model compounds based on different catalysts for hydrogenative degradation and catalytic systems. The methods and strategies to inhibit the condensation reactions are summarized. In particular, density functional theory calculation of the reaction pathways are combined with isotopically labeled reaction pathways to deeply analyze the hydrogenation degradation mechanism of biomass and further improve the yield of monophenols during the hydrogenation degradation of lignin. Finally, a brief summary of the challenges and prospects of lignin hydrogenation degradation is proposed.

show abstract

Catalytic hydrogenolysis of alkali lignin in supercritical ethanol over copper monometallic catalyst supported on a chromium-based metal–organic framework for the efficient production of aromatic monomers

Cited by 21 publications

References 46 publications

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO₂-Doped Carbon-Supported Nickel-Based Catalyst

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO₂-Doped Carbon-Supported Nickel-Based Catalyst

Endophytes in Lignin Valorization: A Novel Approach

Catalytic hydrogenolysis lignin to obtain phenols: A review of selective cleavage of ether bonds

Contact Info

Product

Resources

About

Catalytic hydrogenolysis of alkali lignin in supercritical ethanol over copper monometallic catalyst supported on a chromium-based metal–organic framework for the efficient production of aromatic monomers

Cited by 21 publications

References 46 publications

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO2-Doped Carbon-Supported Nickel-Based Catalyst

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO2-Doped Carbon-Supported Nickel-Based Catalyst

Endophytes in Lignin Valorization: A Novel Approach

Catalytic hydrogenolysis lignin to obtain phenols: A review of selective cleavage of ether bonds

Contact Info

Product

Resources

About

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO₂-Doped Carbon-Supported Nickel-Based Catalyst

Catalytic Conversion of Lignin and Lignin-Derived β-O-4 Ether to Cyclohexanols over a CeO₂-Doped Carbon-Supported Nickel-Based Catalyst