Facile preparation of N-doped graphitic carbon encapsulated nickel catalysts for transfer hydrogenolysis of lignin β-O-4 model compounds to aromatics

Abstract

Herein, N-doped carbon embedded Ni catalysts were prepared by co-impregnation method followed by pyrolysis in N2 atmosphere for transfer hydrogenolysis of lignin β-O-4 model compounds using isopropanol as the hydrogen...

A review on recent trends in selective hydrodeoxygenation of lignin derived molecules

“…Thus, a nitrogen-doped carbon support with nickel catalyst was utilized by Tan et al for the hydrogenolysis of several b-O-4 model compounds. 60 Ni embedded in or encapsulated by N-doped carbon has shown remarkable stability and catalytic activity in hydrogenation reactions and thus, was chosen for the hydrogenolysis of model lignin b-O-4 compounds. The Ni@NC-800 catalysts were encapsulated by graphitic NC shells.…”

Structure elucidation of prot, alkali and dealkaline lignin(s) by NMR, FT-IR and Py-GC/MS: effect of solid acid and base catalysts

“…It helps in the conduction of water from roots to leaves and contributes to about 20-30% of the whole biomass composition. 2 The lignin content varies with the biomass types, e.g., agriculture, forestry and herbaceous. Primarily, it consists of three basic units, i.e., p-coumaryl alcohol, coniferyl alcohol and sinapyl alcohol, whose monomeric sub-aromatic units are phydroxyphenyl (H-type), guaiacyl (G-type) and syringyl (S-type).…”

“…It helps in the conduction of water from roots to leaves and contributes to about 20–30% of the whole biomass composition. 2 The lignin content varies with the biomass types, e.g. , agriculture, forestry and herbaceous.…”

Novel Mechanoenzymatic Strategy for Lignin Depolymerization

“…The oxidative cracking of the β-O-4 bond in lignin has been a focus of research for many years and can be achieved through metal oxidative degradation or nonmetal oxidative degradation methods. Metal oxidative degradation offers high selectivity and mild reaction conditions, but it often requires expensive catalysts or ligands, leading to the presence of heavy metal residues. , On the other hand, nonmetallic oxidation degradation provides a low-cost, nonpolluting alternative, but it typically requires more demanding reaction conditions and is generally less effective with natural lignin. − In recent years, mechanochemical reactions, particularly ball-milling reactions, have gained significant interest in the scientific community. These reactions have shown a superior yield, selectivity, shorter reaction time, and simpler postprocessing steps compared to traditional solvent-based reactions. , Mechanochemistry has proven particularly useful in breaking down biomacromolecules such as lignin and cellulose .…”