Fast catalytic pyrolysis of lignin into monocyclic aromatic hydrocarbons over in-situ generated Fe-based catalyst
This study examined the catalytic pyrolysis of kraft lignin using an in-situ generated Fe-based catalyst from iron ore.The fresh and spent catalysts were characterized by a transmission electron microscope to investigate the morphological changes of the catalysts.To evaluate the catalysts'perform-ance,a segmented pyrolysis reactor coupled with time-of-flight mass spectrometry was employed.The results showed that the fresh catalysts had a particle-like morphology,while the spent catalysts ap-peared sintered.Compared to unreduced iron ore and commercial Fe2O3,reduced iron ore significantly promoted the production of monocyclic aromatic hydrocarbons.A yield of monocyclic aromatic hydrocar-bons reached 81％at the optimized reaction temperature of 550 ℃C,with benzene,toluene,xylene and trimethylbenzene accounting for 46％,34％,13％and 7％respectively.Moreover,the possible pathway for kraft lignin via catalytic pyrolysis was proposed based on dehydroxylation and demethoxyla-tion.This work suggests that a low-cost iron ore catalyst could potentially be applied to pyrolyze kraft lignin to produce valuable bio-based aromatic hydrocarbons.
Catalytic pyrolysisLigninTime-of-flight mass spectrometryIron ore catalystMonocy-clic aromatic hydrocarbons
万方数据
维普
