%0 Journal Article
%T ImmobilizedPdnanoparticlesonTris-modifiedSiO2£ºSynthesis,characterization,andcatalyticactivityinHeckcross-couplingreactions
%A Abdol R. Hajipour
%A Ghobad Azizi
%J ´ß»¯Ñ§±¨
%P 1547-1554
%D 2014
%R 10.1016/S1872-2067(14)60109-1
%X £¿ThepreparationofsupportedPdnanoparticlesonTris(tris(hydroxymethyl)aminomethane)-modifiedSiO2gelandtheircatalyticapplicationinHeckcouplingareinvestigated.ThecatalystwascharacterizedusingacombinationofX-raydiffraction,transmissionelectronmicroscopy,field-emissionscanningelectronmicroscopy,andscanningelectronmicroscopy/energy-dispersiveX-rayspectroscopy.ThesupportedPdnanoparticleswerefoundtobeahighlyactiveandreusablecatalystfortheHeckreactionatalowPdloading(0.02mol%)becauseofstabilizationbytheTrismoieties.Severalreactionparameters,includingthetypeandamountofsolvent,base,andtemperature,wereevaluated.Theheterogeneityofthecatalyticsystemwasinvestigatedusingdifferentapproaches,andshowedthatslightPdleachingintothereactionsolutionoccurredunderthereactionconditions.Despitethismetalleaching,thecatalystcanbereusedseventimeswithoutsignificantlossofitsactivity.
%K Supportedpalladiumnanoparticle
%K Heterogeneouscatalyst
%K Heckcoupling
%K Carbon-carboncouplingreaction
%U http://www.chxb.cn/CN/abstract/abstract21375.shtml