还原热处理对铈锆铝复合氧化物性能的影响.docxVIP

物理化学学报(WuliHuaxueXuebao)

JanuaryActaPhys.-Chim.Sin.2012,28(1),245-250245

[Article]doi:10.3866/PKU.WHXB201228245

还原热处理对铈锆铝复合氧化物性能的影响

肖益鸿杨黄根蔡国辉郑勇郑瑛魏可镁

(福州大学化肥催化剂国家工程研究中心，福州350002)

摘要：采用共沉淀法制备铈锆铝复合氧化物(CeO?-ZrO?-Al?O?,CZA)和铈锆复合氧化物(CeO?-ZrO?,CZ),将样品分别在空气和10%H?IAr气氛下进行热处理，利用X射线粉末衍射(XRD)、O?脉冲吸附、H?程序升温还原(H?-TPR)等手段研究了复合氧化物的结构及性能.结果表明：CZA样品经950℃还原热处理后出现CeAIO?晶相，热处理温度越高，越有利于CeAIO?物相生成.CZA储氧量(OSC)随着还原热处理温度升高逐渐增大，至900℃达到1270.3μmol·g-1;温度继续升高，OSC减小，1100℃还原热处理后CZA的OSC仅为23.2μmol·g-1.研究发现还原热处理中形成CeAIO?,其显著影响CZA样品的储氧性能和还原性能.

关键词：铈锆铝复合氧化物；还原热处理；CeAIO?;储氧性能；还原性能中图分类号：O643

InfluenceofReductiveTreatmentonthePerformanceofCeO?-ZrO?-Al?O?CompositeOxide

XIAOYi-Hong*YANGHuang-GenCAIGuo-HuiZHENGYong

ZHENGYingWEIKe-Mei

(NationalEngineeringResearchCenterofChemicalFertilizerCatalyst,FuzhouUniversity,Fuzhou350002,P.R.China)

Abstract:ACeOz-ZrO?-Al?O?compositeoxide(CZA)andaCeO?-ZrO?compositeoxide(CZ)werepreparedbytheco-precipitationmethod.Thesampleswerethermallyagedinaflowingairatmosphereandin10%H?IArflow.ThestructureandperformanceofthecompositeoxideswerestudiedbyX-raydiffraction(XRD),oxygenstoragecapacity(OSC)measurements,andH?temperature-programmedreduction(H?TPR).TheresultsshowthataCeAIO?phasewasformedafterCZAwasreductivelyagedat950℃andanincreaseintemperaturebenefitedtheformationofCeAIO?.TheOSCofCZAincreasedwithanincreaseinthereductivetreatmenttemperatureanditwas1270.3μmol·g-1whenthetemperaturereached900°℃.However,theOSCdecreasedwithanincreaseinthetemperature.AfterCZAwasreducedat1100℃theosCwasonly23.2μmol·g-1.WefoundthattheOSCandthereducibilityofthematerialwereremarkablyinfluenced