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时间:2020-04-12
《《负载Ni催化剂上低温甘油蒸汽重整制氢》.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第43卷第6期燃料化学学报Vo1.43NO.62015年6月JournalofFuelChemistryandTechnologyJun.2015文章编号:0253-2409(2015)06-0684-08负载Ni催化剂上低温甘油蒸汽重整制氢吕衍安,赵星岭,索掌怀,廖卫平,金明善(烟台大学应用催化研究所,山东烟台264005)摘要:采用等体积浸渍法制备了A12O3、CeO、TiO及MgO负载Ni催化剂,考察了它们对甘油蒸汽重整制氢反应的催化性能。采用x射线衍射、N吸附、透射电镜及H:程序升温还原等方法
2、对催化剂进行了表征。结果表明,载体对Ni催化剂的活性有显著影响。在400℃下Ni/CeO:的催化活性明显好于其他催化剂,活性次序为Ni/CeO:>Ni/A1O,>Ni/TiO~Ni/MgO。Ni/CeO:也具有好的稳定性,反应20h未见活性下降,甘油转化率70%,氢气收率69.2%。这与CeO的本性及其与活性组分的相互作用有关。A1O具有较大的比表面积与孔体积,有利于CO吸附及甲烷化反应的进行,使得Ni/A1O催化剂在较高温度下具有很高的甘油转化率85.7%,但选择性较差。由于MgO载体与活性组分强的
3、相互作用而生成NiMgO固溶体,导致Ni/MgO低温活性差。关键词:甘油;蒸汽重整;制氢;负载Ni催化剂中图分类号:0643文献标识码:ALow·temperaturesteamreformingofglycerolforhydrogenproductionoversupportednickelcatalystsLOYan—an,ZHAOXing—ling,SUOZhang—huai,LIAOWei—ping,JINMing—shan(InstituteofAppliedCatalysis,Yanta
4、iUniversity,Yantai264005,China)Abstract:A1203,CeO2,TiO2andMgOsupportedNicatalystswerepreparedbyincipientimpregnation.Theactivitiesinglycerolsteamreformingtohydrogenproductionwereevaluatedat300~500oC.ThecatalystswerecharacterizedbyXRD,N,adsorption,TEM.an
5、dH,.TPRtechniques.AstrongeffectofsupportontheactivityOfNicatalystwasdetected.Ni/CeO.catalystgivesthehighestactivityamongallcatalystsat400oCandthefollowingactivityorderisshownNi/,CeO,>Ni/A1。O,>Ni//Ti0,一Ni/MgO.OnNi//CeO,,therewasalmostnodeactivationdetect
6、edafter20hreactionwim7O%conversionofglyceroland69。2%Hyield.GoodactivityandstabifityofthecatalystisattributedtotheintrinsicpropertyofCe0andstronginteractionbetweenCeO。andactivenickelspecies.Relativelyhighglyrcerolconversion(85.7%)withlowH,selectivityonNi
7、/,AOcatalystat50o℃isachievedduetoitshighsurfaceareaandlargeporevolume.TheformationofsolidsolutionNiMgphaseobservedinNi/MgOcatalystdoesnotshowthedesiredactivityatlowtemperaturesthoughitenhancedtheinteractionsbetweenactivephaseandthesupport.Baseoxidesuppo
8、rts(Ce0,,MgO)seemtobemoreeffectivethanacidoxidesupportsinpreventingtheformationofC0andCHdasby—products.Keywords:glycerol;steamreforming;hydrogenproduction;supportednickelcatalyst生物质的催化转化是目前催化研究的热点课题CO+H20—}H2+CO2,△/40=--41kJ/mol之
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