摘要
采用氨水-碳酸铵混合沉淀剂制备了低铈型铈锆钇三组分储氧材料.采用X射线衍射、BET、氧脉冲吸附和H2程序升温还原(H2-TPR)等技术对材料的晶体结构、比表面积、孔结构、储氧性能和还原性能进行了研究.结果表明,该材料经873 K焙烧4 h后比表面积达到116.8 m2/g,孔容达到0.30 cm3/g,经1 273 K老化10 h后,比表面积和孔容仍然保持在68.1 m2/g和0.22 cm3/g.由XRD结果可知,材料的物相组成为四方相的Zr0.84Ce0.16O2,在热处理过程中物相结构稳定.氧脉冲吸附和程序升温还原的结果表明,材料储氧性能保持较好.
Low cerium content Ce-Zr-Y tenary compound was prepared with ammonia aqueous solution-carbonate ammonia mixed solution as the precipitator. Its crystal structure, specific surface area, pore size distribution, oxygen storage capacity（OSC） and redox behavior were investigated by X-ray diffraction, BET, oxygen pulse adsorption and H2-temperature programmed reduction （H2-TPR）. The results show a high specific surface area of 116.8 m^2/g and total pore volume of 0. 30 cm^3/g after calcining at 873 K for 4 h, and after aging at 1 273 K for 10 h, the specific surface area and total pore volume of 68. 1 m^2/g and 0. 22 cm^3/g were maintained. According to the results of XRD, there was only one tetragonal Zr0.84Ce0.16O2 in the mixed oxide, and its crystal structure was stable in the process of thermal treatment. The results of OSC and H2-TPR show that the oxygen storage capacities were maintained even after being treated at 1 073 K and 1 273 K indicating the durability of the materials.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第5期944-947,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学重点基金(批准号:20333030)
国家自然科学基金(批准号:20273043)资助
关键词
储氧材料
织构性能
高比表面积
高热稳定性
储氧性能
Oxygen storage material
Textural property
High specific surface area
High thermal stability
Oxygen storage capacity
