由FC结构母体制备乙醇水蒸气重整制氢镍基催化剂的研究

《由FC结构母体制备乙醇水蒸气重整制氢镍基催化剂的研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Y1532153天津大学研究生毕业论文由FC结构母体制备乙醇水蒸气重整制氢镍基催化剂的研究StudyonHydrogenProductionfromSteamReformingofEthanolonNickel．BasedCatalystPreparedfromFCStructuredPrecursor(申请博士学位)学科专业：工业催化研究生：刘说指导教师：李永丹教授林跃生教授天津大学化工学院二零零八年一月用于乙醇水蒸气重整制氢反应。BET结果表明镧和铈掺杂的镍镁铝催化剂比表面积相对于未掺杂的镍镁铝催化剂有明显增加，但是镧和铈掺杂量存在最佳值。氧化

2、物的XRD结果表明一小部分的镧进入到镍镁固溶体中。而铈发生聚集并分布在外表面。TPR结果说明镧和铈的掺杂提高了催化剂的还原能力，其中镧的作用更加明显。XPS数据表明对比于铈掺杂的催化剂，镧掺杂的催化剂被还原成零价镍的量更多。反应后催化剂的XRD结果表明镧掺杂的催化剂中镍晶粒的直径最小，说明镧能更好的抑制镍晶粒的烧结。活性数据表明镧和铈掺杂的催化剂提高了催化活性和稳定性。关键词：乙醇，水蒸气重整，制氢，镍基催化剂，热力学，共沉淀，反相微乳液nABSTRACTMostofthepresentworldenergysupplyscomesfromfoss

3、ilfuels．Butreservesoffossilfuelsarelimited．Peoplerecognizethatreservesofpetroleum，naturalgasandcoalarefiniteforprovidingenergy．Unlikefossilfuels，hydrogencarlburncleanly，withoutemittinganyenvironmentalpollutants．FCsusehydrogenaSafuelwhichresultsintheformationofwatervaporonlyand

4、thustheyprovidecleanenergy．HEisconsideredtobetheenergycarrierofthefutureandcouldhaveanimportantroleinreducingenvironmentalemissions．Currently，mostoftheH2isproducedviathesteamreformingoffossilfuels．However，hydrogenproductionfromfossilfuelsisalwaysaSsociatedwiththeemissionofgree

5、nhousegasesandlocalpollutants．Innature，HEcanbeproducedfromdifferentresources．AmongtheliquidH2resources，ethanolisagoodcandidateforseveralreasons．Ethanolisrenewableandisbecomingavailableeasily．Itiseasytotransport，biodegradable，andlowintoxicity．Athermodynamicanalysisofethanoloxid

6、ativesteamreformingwascarriedoutwithaGibbsfreeenergyminimizationmethod．Theadditionofoxygenlowerstheenthalpyofthesystemandfavorstheheatrecycle．Thermal-neutralconditionsareobmined，atwhichtheheatreleasedfromexothermicreactionsmakesupexactlyfortherequirementoftheendothermicreactio

7、ns．Thermal-neutraltemperatureisafunctionofthefeedcomposition．For700Kthermal—neutralconditionscanbereachedinawiderangeofH20／EtOHandOffEtOHratios．However，thisconditionisnotpracticalbecausethatacatalystactiveintherangeisdifficulttofind．At900K，agivenconditionrangeexitsforthermal-n

8、eutraloperation．At100K，nothermal-neutralconditionexistsinthec