%0 Journal Article
%T Cu,Fe,orNidopedmolybdenumoxidesupportedonAl2O3fortheoxidativedehydrogenationofethylbenzene
%A Tiago Pinheiro Braga
%A Ant£¿
%A nio Narc¨ª
%A sio Pinheiro
%A Edson R. Leite
%A Regina Cl¨¢
%A udia R. dos Santos
%A Antoninho Valentini
%J ´ß»¯Ñ§±¨
%P 712-720
%D 2015
%R 10.1016/S1872-2067(14)60313-2
%X £¿Molybdenum-basedcatalystssupportedonAl2O3dopedwithNi,Cu,orFeoxideweresynthesizedandusedinethylbenzenedehydrogenationtoproducestyrene.Themolybdenumoxidewassupportedusinganunconventionalroutethatcombinedthepolymericprecursormethod(Pechini)andwetimpregnationoncommercialalumina.ThesampleswerecharacterizedbyX-raydiffraction(XRD),N2adsorption-desorptionisotherms,temperature-programmedreductionofH2(H2-TPR),andthermogravimetric(TG)analysis.XRDresultsshowedthattheaddedmetalswerewelldispersedonthealuminasupport.Theadditionofthemetaloxide(Ni,Cu,orFe)of2wt%bywetimpregnationdidnotaffectthetextureofthesupport.TPRresultsindicatedasynergisticeffectbetweenthedopantandmolybdenumoxide.Thecatalytictestsshowedethylbenzeneconversionof28%-53%andstyreneselectivityof94%-97%,indicatingthattheadditionofthedopantimprovedthecatalyticperformance,whichwasrelatedtotheredoxmechanism.Molybdenumoxidesplayafundamentalroleintheoxidativedehydrogenationofethylbenzenetostyrenebyitsredoxandacid-baseproperties.ThesamplecontainingCushowedanatypicalresultwithincreasingconversionduringthereaction,whichwasduetometalreduction.TheNi-containingsolidexhibitedthehighestamountofcarbondeposited,shownbyTGanalysisafterthecatalytictest,whichexplaineditslowercatalyticstabilityandselectivity.
%K Ethylbenzene
%K Styrene
%K Molybdenum
%K Alumina
%K Dopant
%U http://www.chxb.cn/CN/abstract/abstract21577.shtml