摘要
The heavy consumption of non-renewable fossil feedstocks has induced several vital problems such as global warming and energy crises.Biomass,particularly lignin,is a promising renewable resource to substitute fossil fuels for producing value-added chemicals and fuels[1–3].Lignin has a highly irregular and recalcitrant structure that constituted by coumaryl,coniferyl and sinapyl alcohol monomers via intermolecular C–O and C–C bonds in a random order.For a long time,lignin has been regarded as a waste source and burnt for heat.Recently,the high values of lignin as a feedstock to bridge future gaps to supply aromatics have been extensively recognized and various catalytic strategies to transform lignin into arenes,cycloalkanes,etc.have been reported.
