木质素衍生物制备高密度特种燃料研究进展OA

High-density specialty fuels,possessing high energy density and low freezing point,are strategic energy sources in aviation and national defense.They can effectively enhance the flight range,payload capacity and maneuverability of aircrafts.Currently,these fuels mainly rely on petroleum resources.Under the background of"carbon peaking and carbon neutrality",the development of renewable alternative routes is particularly urgent.Lignin,a major component of lignocellulose,is rich in aromatic structures and represents an ideal precursor for constructing high-density specialty fuels.This paper systematically reviews research progress in converting lignin-derived platform compounds(e.g.,phenols,benzaldehydes,benzoquinones and cyclohexanone)into high-density specialty fuels.It highlights methods for constructing polycyclic fuel precursors,including alkylation,aldol condensation,Diels-Alder reaction and Michael addition.Furthermore,current challenges in the synthetic process are discussed.Future efforts should be directed towards understanding structure-property relationships to simultaneously achieve high density,high heating value and low freezing point.It is also essential to conduct life-cycle analysis and techno-economic assessment to support the sustainability and industrial decision-making of the technology.This review aims to provide a reference for research on lignin-based high-density fuels and offer insights for their sustainable development.