Catalysis and chemistry of lignin depolymerization in alcohol solvents - A review

The second-generation biofuel strategy aims to fully utilize lignocellulose, which is the major component of plant cell wall and most abundant form renewable organic resources. Among three components i.e. cellulose, hemicellulose lignin, lignin has been least utilized one up now. Nevertheless, depolymerization (LD) produce aromatic chemicals fuels intensely explored in recent decade. Alcohols have mostly employed solvents LD reaction, are also involved into reaction. This review provides an overview catalysis chemistry reaction alcohols, especially methanol, ethanol isopropanol. advances firstly summarized, then roles alcohol outlined. self-conversions discussed, discussed four subtopics: supplying hydrogen, depolymerizing hindering repolymerization affecting monomer structure. Alcohol alcohol-derived intermediates provide active hydrogen for reductive catalytic carried out without input, effectively break ether linkages but not C-C react with monomers, suppressing side reactions. In addition, inhibits hydrogenation benzene rings involves formation products, structure monomers. With these understandings, challenges opportunities proposed.