Lignin Depolymerization to Guaiacol and Vanillin Derivatives via Catalytic Transfer Hydrogenolysis using Pd-Lewis Metal Oxide Supported on Activated Carbon Catalysts

Kumar, Madambakam Midhun; Prabhudesai, Vallabh S.; Vinu, Ravikrishnan

doi:10.1016/j.mcat.2023.113474

Cited by 8 publications

(1 citation statement)

References 44 publications

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“…Lignin, which accounts for about 10 to 35% of lignocellulosic biomass, , is a promising biomass fraction to produce valuable chemicals and fuels owing to its high content of aromatic structures. − It has been reported that about 100 million tonnes of lignin are produced annually on a global scale, , which may have the ability to afford the worldwide BTX production. However, its cross-linked heterogeneous phenolic polymer structures have made it difficult to depolymerize lignin into the desired monomers such as phenols and BTX. ,, Therefore, such produced lignin is generally destined for incineration as a low-valued fuel. − Considering the continuous demands for BTX and phenolic compounds as chemical feedstock, it is crucial to develop lignin depolymerization technologies for the achievement of a sustainable supply of aromatic chemicals.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of Hydrogen Transfer Route from Hot-Compressed 2-Propanol to Diphenyl Ether over NiCo/C Catalyst

Dowaki,

Sawai,

Nunoura

2024

Ind. Eng. Chem. Res.

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Transfer hydrogenolysis of diphenyl ether (DPE), a lignin model compound, was studied from the viewpoint of the reaction kinetics. Nearly 90% of DPE degradation and formation of aromatic products were demonstrated at 235 °C with the combination of 2-propanol (IPA) as a hydrogen-donating solvent and NiCo/C as a non-noble metal catalyst. Kinetic modeling of reaction results indicated the dominance of direct hydrogen transfer from IPA to DPE over the other possible pathway (indirect transfer via H2 gas). However, H2 gas formation from IPA, which was assumed to be inactive for DPE hydrogenolysis in the model, was also confirmed as a side reaction in a non-negligible amount. DPE hydrogenolysis and H2 formation activation energies were estimated to be 1.2 × 102 and 73 kJ/mol, respectively.

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Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of Hydrogen Transfer Route from Hot-Compressed 2-Propanol to Diphenyl Ether over NiCo/C Catalyst

Dowaki,

Sawai,

Nunoura

2024

Ind. Eng. Chem. Res.

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Carboxyl‐Decorated UiO‐66 Supporting Pd Nanoparticles for Efficient Room‐Temperature Hydrodeoxygenation of Lignin Derivatives

Yangcheng,

Li,

et al. 2024

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Hydrodeoxygenation (HDO) of lignin derivatives at room‐temperature (RT) is still of challenge due to the lack of satisfactory activity reported in previous literature. Here, it is successfully designed a Pd/UiO‐66‐(COOH)2 catalyst by using UiO‐66‐(COOH)2 as the support with uncoordinated carboxyl groups. This catalyst, featuring a moderate Pd loading, exhibited exceptional activity in RT HDO of vanillin (VAN, a typical model lignin derivative) to 2‐methoxyl‐4‐methylpheonol (MMP), and >99% VAN conversion with >99% MMP yield is achieved, which is the first metal‐organic framework (MOF)‐based catalyst realizing the goal of RT HDO of lignin derivatives, surpassing previous reports in the literature. Detailed investigations reveal a linear relationship between the amount of uncoordinated carboxyl group and MMP yield. These uncoordinated carboxyl groups accelerate the conversion of intermediate such as vanillyl alcohol (VAL), ultimately leading to a higher yield of MMP over Pd/UiO‐66‐(COOH)2 catalyst. Furthermore, Pd/UiO‐66‐(COOH)2 catalyst also exhibits exceptional reusability and excellent substrate generality, highlighting its promising potential for further biomass utilization.

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Base-Catalyzed Depolymerization of Organosolv Lignin into Monoaromatic Phenolic Compounds

Kim,

2024

Waste Biomass Valor

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Lignin Depolymerization to Guaiacol and Vanillin Derivatives via Catalytic Transfer Hydrogenolysis using Pd-Lewis Metal Oxide Supported on Activated Carbon Catalysts

Cited by 8 publications

References 44 publications

Kinetic Analysis of Hydrogen Transfer Route from Hot-Compressed 2-Propanol to Diphenyl Ether over NiCo/C Catalyst

Kinetic Analysis of Hydrogen Transfer Route from Hot-Compressed 2-Propanol to Diphenyl Ether over NiCo/C Catalyst

Carboxyl‐Decorated UiO‐66 Supporting Pd Nanoparticles for Efficient Room‐Temperature Hydrodeoxygenation of Lignin Derivatives

Base-Catalyzed Depolymerization of Organosolv Lignin into Monoaromatic Phenolic Compounds

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