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OALib Journal期刊
ISSN: 2333-9721
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effectsofoxidationpretreatmenttemperatureonkovarusedasco2reformingcatalyst
, PP. 573-581
Keywords: co2reformingcatalyst,kovar,oxidationpretreatment
Abstract:
？theeffectofoxidationpretreatmenttemperature(500~1000℃)onthecatalyticactivityofkovarappliedonhydrocarbonco2reformingwasexamined.catalyticperformanceevaluationusingtetradecaneat800℃with70μmol/sco2revealed700and1000℃asthebestpre-oxidationtemperatureinproducingcoandh2,respectively.xrdandsem-edxanalysesshowedthataseparatemetaloxidelayercomposedofironoxide(fe2o3andf3o4),nickel,cobalt,andpossiblytheirrespectiveoxidesstartedtoformwhenoxidationwasconductedat700℃orhigher.thepresenceofironenhancedthestabilityofnickelinthestructurewhilethecompactstructureoffe3o4resultedintotheformationofathickandrigidmetaloxidelayeronthesurfaceofthekovartube.thestrongphysicalbondbetweenthemetaloxidelayerandkovartubeprovidedthecatalystgoodmechanicalstrengthandconsequentlygoodcatalyticactivity.
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