高比表面积MgO-CeO_2复合氧化物的制备和表征  

Preparation and characterization of high-surface area MgO-CeO_2 compound oxides

作　　者：罗孟飞[1] 贾爱平[1] 马静萌[1] 方萍[1] 普志英[1] 

机构地区：[1]浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2006年第4期361-365,共5页Journal of Zhejiang Normal University:Natural Sciences

摘　　要：用共沉淀法制备了高比表面积的MgO-CeO2复合氧化物,考察了表面活性剂和沉淀剂等对MgO-CeO2复合氧化物的影响.结果表明,在表面活性剂十六烷基三甲基溴化铵(CTAB)存在的条件下,采用NaOH为沉淀剂,可以制得比表面积为200 m2/g、粒径为5 nm左右的纳米MgO-CeO2复合氧化物,并且形成了Mg0.1Ce0.9O2-δ固溶体.焙烧温度超过400℃以后,MgO-CeO2晶粒容易长大,使得比表面积下降.The MgO-CeO2 compound oxides were prepared by co-precipitation method. The effect of surfactant and precipitating agent on the BET of MgO-CeO2 compound oxides were investigated. The results showed that in the presence of surfactant CTAB and using sodium hydroxide as the precipitating agent, nanosized MgO-CeO2 compound oxides with a surface area of 200 m2·g^-1 could be produced. In tile meantime a solid solution of Mg0.1Ce0.9O2-δ could be formed. The surface area decreased drastically when the calcination temperature was over 400℃, due to the sintering of the MgO-CeO2 grains.

关 键 词：MgO-CeO2复合氧化物 共沉淀法 X射线衍射 N2物理吸脱附 

分 类 号：O641.2[理学—物理化学]