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1、2011ChineseJournalofCatalysisVol.32No.2ArticleID:0253-9837(2011)02-0258-06DOI:10.1016/S1872-2067(10)60173-8Article:258–263DirectHydroxylationofBenzenetoPhenoloverFe3O4SupportedonNanoporousCarbon11,*12PezhmanARAB,AlirezaBADIEI,AmirKOOLIVAND,GhodsiMOHAMMADIZIARA
2、NI1SchoolofChemistry,CollegeofScience,UniversityofTehran,Tehran,Iran2DepartmentofChemistry,FacultyofScience,AlzahraUniversity,IranAbstract:Fe3O4/CMK-3waspreparedbyimpregnationandusedasacatalystforthedirecthydroxylationofbenzenetophenolwithhydro-genperoxide.The
3、ironspeciesinthepreparedcatalystwasFe3O4becauseofthepartialreductionofiron(III)toiron(II)onthesurfaceofCMK-3.ThehighcatalyticactivityofthecatalystarisesfromtheformationofFe3O4onthesurfaceofCMK-3andthehighselectivityforphenolisattributedtotheconsumptionofexcess
4、hydroxylradicalsbyCMK-3.Theeffectoftemperature,reactiontime,volumeofH2O2,andamountofcatalystonthecatalyticperformanceofthepreparedcatalystwereinvestigated.Underoptimizedconditions,thecatalystshowedexcellentcatalyticperformanceforthehydroxylationofbenzenetophen
5、oland18%benzeneconversionwasachievedwith92%selectivity−1forphenolandwithaTOFvalueof8.7h.Thestabilityofcatalystwasinvestigatedbydeterminingitsactivityafterthefourthrunanditwasfoundtohavedecreasedto80%ofthefreshcatalyst’sactivity.Keywords:nanoporouscarbon;ferrof
6、erricoxide;hydroxylationofbenzene;phenolCLCnumber:O643Documentcode:APhenolisoneofthemostvaluableintermediatesfor[18−21].Becauseoftherelativelylowcostofironsalts,manufacturersanditisstillbeingproducedbythecumenesuitableiron-containingcatalystsforthehydroxylatio
7、nofprocess.However,thereactionpathwayisamultistepproc-benzenetophenolhavebeensought[22−24].Thecatalyticessanditisenvironmentallyunfriendly.Inaddition,theperformanceofFe2O3-containingandFe3O4-containingproductionofphenolbythecumeneprocessdependsonthecatalystsin
8、thehydroxylationofbenzenetophenolhasbeenmarketpriceofacetone,whichisaby-productofthispro-investigated[22,25].TheuseofFe2O3-containingcatalystscedure.Thesedisadvantageslimittheeffic
