MoO_3的水热法制备与表征的研究

以四钼酸铵为前驱体材料,采用水热合成法制备三氧化钼(MoO_3),研究了不同pH值、水热反应时间、填充度、焙烧温度对MoO_3粉体的影响,并应用SEM、XRD微观分析手段对MoO_3粉体进行表征。结果表明:在p H值为1,水热反应时间为16 h,填充度为90%,焙烧温度为550℃时,可以得到大小均匀、表面光洁平整、分散性好的MoO_3粉体;焙烧过程中MoO_3晶体发生了晶型转变,焙烧温度达到350℃时,MoO_3晶体全部由hMoO_3转变为α-MoO_3。

Preparation and characterization of MoO3 by hydrothermal process

Molybdenum trioxide was synthesized by using hydrothermal method and (NH4)2Mo4O13 · H2O as raw material. The effects of different pH value,hydrothermal reaction time,filling degree and calcination temperature on the MoO3 powder were studied. The structure and morphology of the samples were characterized by XRD and SEM. Results show that,when the pH value is 1,the hydrothermal reaction time is 16 h,the filling degree is 90%and the calcination temperature is 550℃,MoO3 powder has uniform size,smooth surface and good dispersion;The crystal type of MoO3 is changed during the calcination process,and all the MoO3 crystals change from h-MoO3 toα-MoO3 when the calcination temperature reaches 350℃.