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AppliedCatalysisA:General360(2009)177–182ContentslistsavailableatScienceDirectAppliedCatalysisA:Generaljournalhomepage:www.elsevier.com/locate/apcataPreparationofrecoverableRucatalystsforliquid-phaseoxidationandhydrogenationreactionsMarcosJ.Jacintoa,OsvaldoH.C.F.Santosa,RenatoF.Jardimb,RichardLandersc,LianeM.Rossia,*aInstitutodeQuı´mica,UniversidadedeSa˜oPaulo,05508-000,Sa˜oPaulo,SP,BrazilbInstitutodeFı´sica,UniversidadedeSa˜oPaulo,CP66318,05315-970,Sa˜oPaulo,SP,BrazilcInstitutodeFı´sica,UNICAMP,13083-970,Campinas,SP,BrazilARTICLEINFOABSTRACTArticlehistory:Weherereportthesynthesis,characterizationandcatalyticperformanceofnewsupportedRu(III)andReceived23January2009Ru(0)catalysts.Incontrasttomostsupportedcatalysts,thesenewdevelopedcatalystsforoxidationandReceivedinrevisedform10March2009hydrogenationreactionswerepreparedusingnearlythesamesyntheticstrategy,andareeasilyAccepted14March2009recoveredbymagneticseparationfromliquidphasereactions.ThecatalystswerefoundtobeactiveinAvailableonline25March2009bothforms,Ru(III)andRu(0),forselectiveoxidationofalcoholsandhydrogenationofolefins,respectively.ThecatalystsoperateundermildconditionstoactivatemolecularoxygenormolecularKeywords:hydrogentoperformcleanconversionofselectedsubstrates.ArylandalkylalcoholswereconvertedtoMagnetitenanoparticlesaldehydesundermildconditions,withnegligiblemetalleaching.Ifthemetalisproperlyreduced,Ru(0)MagneticrecoveryRutheniumnanoparticlesimmobilizedonthemagneticsupportsurfaceareobtained,andthecatalystbecomesHydrogenationactiveforhydrogenationreactions.Oxidationß2009ElsevierB.V.Allrightsreserved.1.Introductionusuallyaccomplishedbymeansofcomplexwork-upprocedures.AttemptstoimprovecatalystrecoveryandrecyclingincludetheThesearchfor‘clean’or‘green’technologiesmergeswiththeuseofbiphasicsystems[5–10]ortheimmobilizationofcatalystssearchforcatalyticsystemsthatactivatecleanoxidizingagentsonsolids[11–15].Anchoringmetalcomplexesoftenrequires(e.g.O2)orreducingagents(e.g.H2)fo
