铈锆固溶体模板合成及储氧性能研究.pdf

摘舞{藩羹本文聚用均匀沉淀法,以不问类型的表面活性剂作为模板剂,运用模板分子缀装理论,含戒国不溺瘵尔跣的镑锆露溶体(Ce。Zr。02)。分桥研究了合成工艺参数(反应温度、时间、焙烧瀑发及时螂、反应娩的浓嶷、表蕊堰性刹婚醛类及用董、铈弓锫的藤尔眈,等),对所制蓊的铈锚阐溶体比表面积、晶体结构、锫氧性能(Redox)戆黪嚷。,8e℃瞧漫沉{皂反应72h,以尿素为沉淀剂),。较详尽地研究了镑、镣锆、镰键铥(锈)等不露豁讫学缱分、灞一纯学缳劳不嚣菇藩终构、同种结构下刁:闹比袭黼积对储氧量(OSC)的贡献,并分析探讨了储氧性能的影蕊鍪素及作嚣辊瑗。, 通过XRD、BET、BJH等手段测试分析了Ce。Zri。02晶体结构、比表恧积、孔缕构。实验表明当箝离子袭面活褴嗣(cTAB),钸锆固溶体比表蕊积最大(142m2/g);反应沉化时间为72小时,可获褥纳米掺状晶体结构的铈锆固溶体,在24h-72h内随着反应时间的延长,-棒状的变化过稷:在80。C恒瀑滠化反应72小时,合成载不竭摩尔魄镄链爨溶体中,Ce:Zr为1:9时,比表面积最大(172m2/R)。逶过BET、SEM、TEM、OSC等’攒《试方法,分毒厅了Ce02、Ce。ZrlIx02、 Ce-zr—La、Ce—Z卜Y等在350。C条件下的鼎体结构、比表黼积对Redox性能的影褥t结票嚣示,ee。zf】.x02储氧整能最强、Ce。矗。La(Y)好于Ce02;锦话固溶体Ce:Zr在5:5,6:4,7:3时,均取得较高的储氧星。最后得出结论铈锫网溶体静比表面积、体褶结构、焙烧温度是储裁量重要的影响豳素,并初步探讨了氧吸附的理论即氧迁穆性能。关键霭均匀沉淀;摸攫裁;镰镶晷溶镕;继氧爨 It泉互韭A学工学璇j:学位论文 Abstract A series ofCeria-Zirconium solidsolutions were synthesized by themethod of equality precipitation and different template self-assembly technology After studied oftheCeria—Zirconium solid solutions,it was found thattheparameters(reaction temperature andtime,calcination temperature and time,concentration ofreactant,the type and concentration oftemplate,molar ratioofCeria toZirconium,etc)in the process ofsynthesis affected thespecific surface area,crystal structure and oxygen storage capacity forms solidsolutions ofCe—Zr-La,Ce— Z卜Y were synthesized on the saIne condition(CTAB astemplate,reacted 72hours at 80。C,urea as depositional reagent).Particularly analyzed affection parameters ofthe oxygen storage capacity and studied on itsactiontheory paring the resultsof different forms ofCe、Ce—Zr、Ce-Zr-Y(La),different crystal structure ofthesame form mad differentspecific surface areaofthesamecrystalstyte. Tested thecrystal,specific surface area and pore structure ofCeria-Zirconium solidsolutions through the testmethod ofXRD,BET and resultsshowed thatthespecific surface area was thelargest(142m2/g)when theconcentration of CTAB was O2mol/l;thecrystal