铈锆铝氧化物微纳米复合材料及其性能研究

Research of Micro@nano Structure of the Cerium Zirconium Aluminum Oxide and Its Surface Properties

研究了纳米铈锆氧化物在催化材料铈锆铝氧化物的性能。通过合成纳米颗粒铈锆氧化物CeZrO,与微米颗粒氧化铝Al_(2)O_(3)组装成微纳米复合结构的催化材料CeZrO@Al_(2)O_(3),对其表面形貌、元素组成及还原性能进行了表征。结果表明,铈锆氧化物纳米颗粒分散负载于氧化铝微米颗粒的外层表面,形成核壳结构型的颗粒状复合材料,材料表面铈锆元素含量大幅高于体相组成,有效提高了铈锆氧化物的利用率;微纳米复合材料CeZrO@Al_(2)O_(3)的还原温度比常规微米混合材料低约50℃,微纳米结构材料较易于还原,还原速率加快增强了储氧/释氧作用,更有利于改善各类催化性能,可解决常规混合微米材料在储氧/释氧性能不足的重要问题。

In this work,it is reported that the utilization rate and surface and reducing properties of nano cerium zirconium oxide in catalytic materials.The CeZrO nanoparticles were synthesized and then self-assembled with micron-sized Al_(2)O_(3)particles to form a micro/nano composite catalytic material CeZrO@Al_(2)O_(3).The composite materials were characterized for their surface properties,elemental composition,and reducing properties.It is showed that the cerium zirconium oxide nanoparticles are dispersed on the surface of the alumina micron particles to form a core-shell structure composite material.Moreover,the surface composition of cerium zirconium elements was found to be much higher than the bulk phase composition,which effectively improves the utilization rate of cerium zirconium oxide.The reduction temperature of the micro/nano composite material CeZrO@Al_(2)O_(3)is 50℃lower than conventional mixed micro material,the results show that the micro/nano composite material are easy to reduce,and improve the reduction rate of the oxygen storage/release,which is beneficial to improve various catalytic properties,and the key problem that theoxygen storage/release of the conventional mixed micron materials are lack in the useis solved effectively.