【摘要】 用共沉淀法制备了CeZr,CeYZr,LaCeZr,LaCePrZr,LaCePrYZr和LaCePr固溶体,并对样品进行了XRD,BET,OSC以及催化性能测试和分析,表明所制备的固溶体全部为立方相结构,少量掺杂Y可以提高固溶体的比表面积和热稳定性;少量掺杂La也可以提高固溶体的热稳定性,但掺杂量过大时固溶体的比表面积和热稳定性均下降;用包头稀土矿提Nd后的LaCePr富集物制备的LaCePrZr和LaCePrYZr固溶体也具有较大比表面积和较好热稳定性。同时也采用浸渍法用Al2O3和SiO2对CeZr固溶体进行了包覆,CeZr固溶体包覆Al2O3和SiO2后比表面积和老化后的比表面积都有很大的提高。更多还原

【Abstract】 CeZr,CeYZr,LaCeZr,LaCePrZr,LaCePrYZr and LaCePr solid solutions were prepared via coprecipitation,and characterized using X-Ray Diffraction(XRD) and Brunauer-Emmett-Teller(BET) techniques.The oxygen storage capability(OSC) of the solid solutions was evaluated by the pulse technique and the catalytic activity was assessed using a 4-channel catalysis device.It was showed that the solid solutions presented cubic structure.The specific surface area and thermal stability could be enhanced by doping Y into the solid solutions.Doping a small amount of La played a positive effect on thermal durability while doping a large amount of La decreased the specific surface area and thermal stability.The LaCePrZr and LaCePrYZr solid solutions as synthesized using Baotou rare earth mineral residue enriched with LaCePr after Nd extraction presented a certain higher value in specific surface area and thermal stability,thereby enabling to be used as economic catalysts for automobile exhaust purification.Coating Al2O3 or SiO2 layer on the surface of ceria-zirconia solid solutions increased the specific surface area and thermal resistance.更多还原