摘要
通过对MoO3氢还原过程的热力学分析 ,找到了制备均匀细颗粒Mo粉的热力学途径—彻底快速除去还原系统中的水分。设计了封闭还原系统 ,用此系统进行氢气热还原 ,不仅使氢气得到充分利用 ,而且容易判断反应终点 ,缩短了Mo粉在恒温区的时间 ,阻止了颗粒的长大。以 (NH4 ) 6 Mo7O2 4 ·2H2 O为原料制备MoO3。通过系统内的特殊装置除水 ,降低了还原温度和湿度 ,用封闭循环氢还原法还原MoO3,在 65 0℃下得到了Mo粉 ,其粒径在 40～ 80nm之间 ,纯度为 99.62 %。
The reduction process by hydrogen for MoO 3 was analyzed in thermodynamics. On this basis the preparation of uniform and fine Mo nano powders was got and speedy removing water vapor from reduction system was observed. Through designing seal reduction system, the hydrogen utilization ratio is high and the destination of the reaction is easily judged. The precursor of MoO 3 was prepared with (NH 4) 6Mo 7O 24 ·2H 2O using the decomposition reaction. The lower temperature can be reached by the special water removing device. The uniform nano Mo powders are prepared by seal circulation hydrogen reducing MoO 3 powders at 650 ℃. The Mo particle size is 40～80 nm. Purity is 99.62%.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2004年第4期627-630,共4页
Chinese Journal of Rare Metals
基金
辽宁省自然科学基金资助项目 ( 0 0 2 0 5 4)
关键词
钼
纳米粉
封闭循环氢还原
热力学
Mo
nano powders
seal circulation hydrogen restores
thermodynamics
