不同结构硫化钼催化剂上酚类模型化合物的加氢脱氧

摘要

Several MoS2 catalys of different structure,prepared by in situ decomposition of ammonium heptamolyb-date(AHM)and molybdenum naphthenate(MoNaph),and by MoS2 exfoliation(TDM),were characterized by BET,X-ray diffraction(XRD),Energy Dispersive X-ray(EDX)and transmission electron mlcroscopy(TEM).The analy-sis showed that MoS2 structure was dependant upon the preparation procedure.The activity of the catalyst was de-termined by measuring the hydrodeoxygenation(HDO)of phenol,4-methylphenol and 4-methoxyphenol using a batch autoclave reactof opcrated at 2.8 MPa of hydrogen and temperatures ranging from 320 370℃.By comparing the conversion.the reactivity order of the catalysts was:AHM>TDM-D>MoNaph>thermal>MoS2 powder>TDM-W.Also.the effect of reaction temperature Oil the HDO conversion was explained in terms of equilibrium of reversible reaction kinetics.The main products of the HDO for phenolic compounds were identified by gas chro-matography/mass spectrometry(GC/MS).The results showed that the product distribution and the HDO selectivity were correlated with the reaction temperature.Two parallel reaction routes,direct hydrogenolysis and combined hy-drogenation-hydrogenolysis,were confirmed by the analysis of the product distribution.High temperature favored hydrogenolysis over hydrogenation for HD0 of phenol and 4-methoxyphenol,whereas for 4-methylphenol the re-verse was true.