Selective hydrogenolysis of lignin in the presence of Ni3Fe1 alloy supported on zirconium phosphate

Gao, Ying; Ma, Hongwei; Rao, Yinan; Lv, Kaiqi; Shu, Fenghao; Long, Jinxing

doi:10.1016/j.ces.2023.118570

Cited by 8 publications

(1 citation statement)

References 62 publications

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“…Lignin, as one of the abundant natural renewable resources, has been extensively researched in the field of fabricating aromatic products, biodegradable materials, and liquid fuels due to the specificity of its composition and structure. − It has been found that lignin consists of coumarin (H), mustard alcohol (S), and pineal (G) groups, which are randomly connected by C–C/C–O bonds (4-O-5, α-O-4, β-O-4, β–β, β-1, etc.) to form natural aromatic polymer compounds with complex three-dimensional networks. − In recent years, on the strength of the structural characteristics of lignin, it has been extensively demonstrated that lignin catalytic depolymerization (LCD) for liquid fuels and cooperative production of phenolic monomers is one of the promising methods for highly efficient utilization of lignin. , …”

Section: Introductionmentioning

confidence: 99%

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

Chen,

Zhou,

Wang

et al. 2024

Energy Fuels

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Lignin catalytic depolymerization (LCD) in supercritical ethanol for the preparation of liquid fuels and phenolic monomers is one of the promising strategies for the valorization of lignocellulosic biomass. This paper reported sepiolite (SEP)-supported Co−Zr catalysts (Co−Zr/SEP) with different Co/Zr ratios for LCD in supercritical ethanol. The characterization results revealed that the cobalt oxides interacted with the SEP framework to create abundant pores, which increased the accessibility of the active sites with lignin fragments. Furthermore, the Zr additive promoted the conversion of Co(OH) 2 to Co 3 O 4 to increase Lewis acid sites (LAS) and oxygen vacancies (V O ), which could enhance the adsorption and stabilization of reactive intermediates. Among the samples, 3Co1Zr/SEP exhibited the superior surface area and the highest LAS and abundant V O . The experimental results showed that the Co/Zr ratio significantly affected the yields of liquid products and phenolic monomers, and 3Co1Zr/SEP achieved the outstanding liquid product yield (60.11%) and the optimal yields of guaiacols (445.2 mg/g lignin) and alkylphenols (109.8 mg/g lignin) under the optimal reaction conditions. Additionally, 3Co1Zr/SEP significantly reduced the apparent activation energy for breaking β-O-4 bonds to 71.46 from 89.94 kJ• mol −1 over SEP by model experiments; furthermore, the possible reaction pathways of LCD over 3Co1Zr/SEP were proposed.

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Section: Introductionmentioning

confidence: 99%

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

Chen,

Zhou,

Wang

et al. 2024

Energy Fuels

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Mechanistic Insights into Formation of Residual Solid in Lignin Depolymerization

Lv,

Chen,

Zhang

et al. 2023

ChemSusChem

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Current techniques of lignin conversion are challenged by the low carbon utilization efficiency resulting from the severer generation of residual solid (char). Therefore, a better understanding of pathway for char formation is significant and highly desired to lignin valorization. In this work, we propose a fundamental mechanistic insight into char formation in the lignin depolymerization, using hydrothermal decomposition as the model reaction. The results demonstrate that the char featuring a multi‐layer construction of coke and oligomer contains mainly G units, primarily generated from native G‐lignin and demethoxylation of S‐lignin. Instead, H‐lignin contributes to the formation of volatile monophenols. Furthermore, new methylene bridges form between the benzene ring in lignin, which consequently results in the formation of recalcitrant char. Based on these observations, a plausible mechanism for char formation is proposed and verified by the density functional theory calculation.

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Catechyl lignin extracted from candlenut by biphasic 2-methyltetrahydrofuran/water: Characterization and depolymerization

Yin,

Zou,

Xiao

et al. 2024

Chemical Engineering Science

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Selective hydrogenolysis of lignin in the presence of Ni3Fe1 alloy supported on zirconium phosphate

Cited by 8 publications

References 62 publications

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

Lignin Catalytic Depolymerization for Guaiacols and Alkylphenols over Co–Zr/Sepiolite under Supercritical Ethanol

Mechanistic Insights into Formation of Residual Solid in Lignin Depolymerization

Catechyl lignin extracted from candlenut by biphasic 2-methyltetrahydrofuran/water: Characterization and depolymerization

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