简介:Anoveladditiveincorporatedintothecatalystforremovingtraceolefinsfromaromaticswasproposed,andunderthelaboratoryconditionsthelifetimeofthecatalystwasincreasedfrom5hto8huponspecifyingtheconversionoftheolefinsequatingtomorethan55%asacriterion.Catalystproduction,whichwasnamedROC,hasbeensuccessfullyscaledupfromlaboratoryformulationstocommercialscalemanufactureandover100tonsofcatalysthadbeenproduced.ThesuperiorityincatalyticactivitywasidentifiedbytheevaluationtestsoftheROCcatalystbasedonwhateverkindoffeedstocks(withtheirbromineindexrangingfrom400mgBr/100gto1200mgBr/100g)beingusedasthefeedstock.TheX-raydiffractionpatternshadverifiedthattheadditivewashighlydispersedonthesurfaceofcatalyst;theGC-FIDanalysisresultsshowedthattheROCcatalystcouldincreasethexylenecontent;thepyridine-FTIRspectroscopicanalysessuggestedthattheadditivecouldincreasetheamountoftheweakLacids,whichwasthemaincauseleadingtoenhancementofthecatalystactivity.
简介:HighresolutionmassspectrometryincombinationwithdistillationandSARAfractionationprovidesusanopportunityforin-depthunderstandingaboutthehydrotreatingprocessatthemolecularlevel.Inthisstudy,theatmosphericresiduederivedfromArabianheavycrudeanditshydrotreatedproductswereinitiallysubjectedtodistillationandSARAfractionation.ThesaturateswerecharacterizedbyGCFI/FDTOFMS.ThearomaticsandresinswerecharacterizedbyAPPIFT-ICRMS.Compositionalchangesofdifferentcompounds(paraffins,naphthenes,aromatichydrocarbons,andheteroatomiccompounds)containedindifferentdistillates(vacuumgasoil,vacuumresidue)wereobtained.Moredetailedknowledgeaboutthehydrotreatingprocesswasachieved.