摘要
利用液相沉淀法在有机溶剂中制备了ＺｒＯ２超细粒子，运用透射电镜（ＴＥＭ）、Ｘ射线衍射（ＸＲＤ）和差热热重（ＤＴＡＴＧ）等分析手段对粉体进行了表征．结果表明，粒子颗粒均匀、分散性良好，平均粒径为２５ｎｍ．实验还发现，制备过程在有机溶剂中进行并采用低温热处理方法可以有效地排除溶胶中水的影响，从而大量消除合成粉体中硬团聚体生成的现象．在自制的ＺｒＯ２超细粒子和大颗粒的商品ＺｒＯ２上进行了ＣＯ加氢反应，发现粒子的粒度对反应的选择性有明显的影响．
Ultrafine ZrO 2 particles have been prepared by the hydrolysis of ZrOCl 2·8H 2O in organic solvents. The samples identified by DTA TG, XRD and TEM showed good dispersity and average particle size of 25nm. By this method, water in the Zr(OH) 4 sol was replaced by organic solvents, so that no hard agglomerates were formed. The reaction of CO hydrogenation was carried out over ultrafine and bulk catalysts and the results showed that the dispersity has great effect on the selectivity for CO hydrogenation.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1998年第6期530-532,共3页
关键词
液相沉淀法
二氧化锆
超细粒子
一氧化碳
加氢
Liquid precipitation method, Zirconia, Ultrafine particle, Carbon monoxide, Hydrogenation
