简介:Thispapermainlycoversamethodforpreparingahighlyalkalinemagnesiumlinoleatesolutionwithatotalbasenumber(TBN)valueof328mgKOH/gusinglinoleicacidasthebiodegradablerawmaterial,whichcansubstitutefortraditionallubricantdetergentsasanenvironmentallyfriendlydetergent.Reactionconditions,includingthemolarratioofmagnesiumoxidetolinoleicacid,themolarratioofmethanoltomagnesiumoxide,thecarbonationtemperature,themolarratioofwatertomagnesiumoxide,theflowrateofCO2gasandthedurationforinjectionofCO2tomagnesiumoxidesystem,wereoptimized.
简介:Effectsofhydrochlorideaciddealuminationofmordenite(MOR)catalystsforthesynthesisof1-phenyl-1-xylylethane(PXE)wereinvestigated.ThestructureandacidityofcatalystswerecharacterizedbyXRD,BET,XRF,FT-IR,27AlNMRandNH3-TPDtechniques.Thecatalyticperformanceoftheacid-treatedMORzeoliteswasstudiedthroughusingthealkylationofo-xylenewithstyrene.ThetestresultsshowedthatthestrengthofremainingBr?nstedacidsitesincreaseddespitethereductionoftotalnumberofacidsitesafterdealumination,andthemicroporesofHMORwereslightlyenlargedcoupledwiththeformationofsecondarymesopores.Additionally,themodifiedHMORzeolitesshowedlongercatalystlifewiththestyreneconversionrateretained.Amongthecatalystsemployedinthisstudy,themodifiedmordenitethatwasdealuminatedbyHCl(2mol/L)couldbeusedrepeatedlywithoutsignificantlossofactivityandselectivityduringsixcatalyticruns,whichhavebeenascribedtoitsspecificacidityandstructuralproperties.