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催化学报 2011
DeactivationandRegenerationofNickel-BasedCatalystsforSteam-MethaneReformingDOI: 10.1016/S1872-2067(10)60175-1, PP. 273-279 Keywords: nickelcatalyst,steamreforming,deactivation,sintering,sulfurpoisoning,regeneration Abstract: ？ThedeactivationofnickelcatalystsusedinArakandRazipetrochemicalcomplexesfollowedbycatalystregenerationwasevaluated.ThecharacterizationofthedifferentstructureswasmadebypowderX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),energydispersiveX-rayspectroscopy(EDS),transmissionelectronmicroscopy(TEM),andcarbon&sulfuranalyzer.TheNiparticlesizewasestimatedfromXRDpatternsandTEMgraphs.TheagglomerationofnickelparticleandthepoisonbysulfurcomponentswererecognizedasthemainreasonsindeactivationofArakandRazicatalysts,respectively.TheactivityoftheusedcatalystsbeforeandafterregenerationwasmeasuredonmethanesteamreformingataCH-4:H2Oratioof1:3at850oC.TheregenerationprocessesforArakandRazisampleswereperformedwithCO2asanoxidativeatmosphereandsteamasaregeneratingagent,respectively.Theresultsshowthat,(1)noresidualsulfurcomponentswereontheregeneratedRazicatalystsurfacewithoutchangingthestructureofthecatalystandtheregeneratedcatalysthasgained80%ofitscatalyticactivity,andthat(2)thenickelparticlesizeofregeneratedArakspecimendecreasedremarkablyasmeasuredbyDebye-ScherrerequationfromXRDpatterns.TEMimageswereinagreementwiththeXRDresultsandindicatedadecreaseinnickelparticlesizeofregeneratedcatalyst.Additionally,inbothregeneratedcatalystsallthecokeonthesurfaceofthesupportwaseliminatedafterregeneration.
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