多元复合铁基非贵金属催化剂的制备与结构表征  

Preparation and characterization of iron-based non-noble perovskite type compound catalyst

作　　者：李丽[1] 袁福龙[1] 付宏刚[1] 张国[1] 光焕竹[1] 姜安玺[2] 

机构地区：[1]黑龙江大学化学化工与材料学院,黑龙江哈尔滨150080 [2]哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工业大学学报》2006年第3期452-455,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(20271019);黑龙江省自然科学基金资助项目(B200504);黑龙江省博士后基金资助项目;黑龙江大学青年科学基金资助项目(QL200425)

摘　　要：用溶胶-凝胶法制各了Fe基非贵金属钙钛矿系列化合物．TG-DTA分析了晶相转化过程，XRD研究了其晶体结构．结果表明：非贵金属掺入后并没有改变钙钛矿化合物的基本结构，在取值范围内均可形成具有ABO，结构的复合氧化物，钙钛矿晶相生成温度在650-750℃．Sr掺入后，La1-x SrxFeO3体系随着x值的增大主峰（110）晶面的衍射布拉格角向着高角度方向微小位移，形成多相复合，不仅生成La0.8 Sr0.2FeO3而且Sr可以完全取代La形成SrFeO3-λ．La1-x-y，SrxCeyFeO3晶相中出现少量的分散较好的CeO2晶相，Ldn0.8Sr0.1Ce0.1FeO3主要物相为LaFeO3，SrFeO3-λ、La0.8Sr0.2FeO3和CeO2．红外分析表明：B位元素调变时，主峰晶面的衍射布拉格角向高角度方向改变，晶胞参数减小，平均离子半径减小，Fe-O键先增强后有微弱减弱，总的趋势是增强．Iron-based non-noble perovskite type compounds are prepared by sol-gel method to develop threeway catalyst. The phase transition is determined by DTA-TG and the formation of perovskite structure has been characterized by X-ray diffraction （XRD） for all samples. XRD and IR analyses reveal that the samples are basically perovskite phase, and the temperature of the phase is in 650-750 ℃. The main peak （110） lattice of La1-xSrxFeO3 series exists a little change toward high 20 with the increase of x and forms mutil-phase composed of not only La0.8Sr0.2FeO3 but also SrFeO3-λ with Sr introduced, in phase ofLal1-x-ySrx CeyFeO3 there exists a little well-dispersing CeO2. The main phases of La0.8 Sr0.1 Ce0.1 FeO3 are LaFeO3, SrFeO3-λ, La0.8 Sr0.2 FeO3 and CeO2. IR analysis shows that the main adsorption peaks are stretching to high frequency with B element exchanged, yet the lattice parameter and the average iron-radius are decreasing. The Fe-O bond force firstly becomes stronger and then a little weaker but totally more stronger at last.

关 键 词：多元复合 非贵金属 铁基钙钛矿复合氧化物 汽车催化剂 

分 类 号：O643.36[理学—物理化学]