%0 Journal Article
%T NitrousOxideDecompositionoverAlkali-PromotedMagnesiumCobaltiteCatalysts
%J ´ß»¯Ñ§±¨
%P 264-272
%D 2011
%R 10.1016/S1872-2067(10)60174-X
%X £¿ThedirectdecompositionofN2Owasinvestigatedoveraseriesofmagnesiumcobaltitecatalysts,MgxCo1-xCo2O4(0.0¡Üx¡Ü1.0),whichwerepreparedbythethermaldecompositionofstoichiometricamountsofmagnesiumhydroxideandcobaltacetate.Thethermalgenesisofthedifferentcatalystsfromtheirprecursorswasexploredusingthermogravimetricanalysis,differentialthermalanalysis,andX-raydiffraction.TextureanalysiswascarriedoutusingN2adsorptionat¨C196¡ãC.Wefoundthatallthecatalyststhatwerecalcinedat500¡ãChaveaspinelstructure.N2Odecompositionactivitywasfoundtoincreasewithanincreaseinthespinelstructure¡¯smagnesiumcontent.Theinfluenceofalkalicationpromoters(Li,Na,K,andCs)ontheactivityofthemostactivecatalystintheMgxCo1-xCo2O4series,i.e.MgCo2O4,wasalsoinvestigated.Thesequenceofthepromotionaleffectwasfoundtobe:un-promoted<Li<Na<Cs<K-promotedcatalyst.Thereasonfortheincreaseinactivityfortheaddedalkalicationswaselectronicinnature.Additionally,thedependenceoftheactivityontheK/Coratiowasalsodetermined.ThehighestactivitywasobtainedforthecatalystwithaK/Coratioof0.05.AcontinuousdecreaseinactivitywasobtainedforhigherK/Coratios.ThisdecreaseinactivitywasattributedtotheeliminationofmesoporosityinthecatalystswithK/Coratios>0.05,basedonN2adsorptionandscanningelectronmicroscopyresults.
%K nitrousoxide
%K cobaltoxide
%K magnesiumcobaltite
%K spinel
%K alkalipromotion
%U http://www.chxb.cn/CN/abstract/abstract20301.shtml