摘要
用共沉淀法制备了CZO和CZYO复合氧化物,对在750,900,1050℃老化的样品进行XRD,BET和OSC的测试和分析。在高温条件下纯CeO2样品的比表面积和OSC迅速下降,晶粒尺寸快速增大;所制备的CZO复合氧化物由立方相和四方相两种结构的固溶体组成,在高温老化后氧化物晶粒的尺寸增大较快;CZYO复合氧化物中的Y含量增至0.15mol时形成均相的固溶体,且氧化物的晶粒尺寸增长较慢,Y起到了高温条件下稳定氧化物性能的作用;CZYO复合氧化物具有BET表面积大、OSC高等优良的耐高温性能,是适用于开发新一代TWC的储氧材料。
CZO and CZYO series composite oxides were prepared by coprecipitation. XRD, BET and Oxygen storage capacity (OSC) investigations were performed on samples aged at 750, 900 and 1050 ℃ respectively. It is found that BET surface area and OSC decrease seriously on CeO_2 aged at high temperature, and the crystal size increases obviously. The prepared CZO samples consist of cubic- and tetra- crystal phase, and the crystal size increases rapidly while aged at high temperature. The CZYO samples consist of single crystal phase when Y content exceeds 0.15 mol, and the crystal size increases slowly during high temperature aging. It is concluded that additive Y can stabilize the performance of CZYO compounds. The CZYO series composite oxide, with its large BET surface area, high OSC and good high-temperature resistance performance, is promising oxygen storage compound for the new TWC technology.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2004年第1期81-84,共4页
Journal of the Chinese Society of Rare Earths
基金
国家"九五"科技攻关项目(96 910 03 02)
