MoO_3纳米纤维的制备及其氢还原特性研究  

Preparation and Hydrogen Reduction Property of MoO_3 Nanofibers

作　　者：赵鹏[1] 王跃峰[1] 李晶[2] 周新文[2] 

机构地区：[1]长安大学,陕西西安710054 [2]金堆城钼业股份有限公司,陕西西安710075

出　　处：《稀有金属材料与工程》2009年第10期1818-1821,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50472028)

摘　　要：以仲钼酸铵和硝酸为原料通过水热法在170℃下恒温40h获得直径为50～100nm、长度大于20μm的MoO3纳米纤维。在450～650℃的不同温度下对所合成的MoO3纳米纤维进行氢气还原,利用XRD和FSEM对还原样品进行表征。结果发现,MoO3纳米纤维在450℃的还原温度下有MoO2形成,在600℃的温度下被完全还原成粒度为0.1～2μm的Mo粉。在还原过程中,大部分MoO3纳米纤维形状不具有继承性,而处于自由空间的小部分单根MoO3纳米纤维可以转化成针状Mo颗粒。MoO3 nanofibers with 50-100 nm diameter and larger than 20 μm length were prepared at 170 ℃constant temperature for 40 h using （NH4）6Mo7O24-4H2O and nitric acid as starting materials through hydrothermal process. Then the hydrogen reduction tests of the prepared MoO3 nanofiber were carried out at different temperatures within 450-650 ℃. The samples prepared by hydrogen reduction tests were characterized by XRD and FSEM. The results indicated that MoO3 nanofibers began to change into MoO2 at 450 ℃, and could be completely reduced to Mo powder with 0.1-2 μm particle size at 600℃. During the reduction process, the original fiber-like morphology of most MoO3 nanofibers was not well-retained; but in some cases, the fiber-like morphology of a small part of single MoO3 nanofibers in free space could be retained, and changed into needle-like Mo particles.

关 键 词：MOO3 纳米纤维 水热合成 氢气还原 

分 类 号：TB383.1[一般工业技术—材料科学与工程]