溶胶-凝胶法制备V_2O_5微晶及其合成活化能研究

Preparation and Synthesized Activation Energy of V_2O_5 Microcrystallites Synthesized by Sol-gel Method

以NH4VO3和CO(NH2)2等为起始原料,采用溶胶-凝胶法制备了V2O5微晶。研究了煅烧温度对产物物相和显微结构的影响,以及反应的合成活化能。采用X射线衍射、扫描电镜等手段对产物进行了表征。结果表明,后处理温度为500℃可得到V2O5微晶,当反应温度超过600℃时,V2O5微晶表现出(001)晶面的取向生长特征。通过差热分析,计算得到其合成活化能为95.81 kJ/mol。

V2O5 microcrystalline was prepared by sol-gel method using NH4VO3 and CO（NH2）2 as raw materials.The influence of the calcining temperatures on the phases and microstructures of V2O5 and the synthesized activation energy were particularly investigated.V2O5 microcrystallites were characterized by X-ray diffraction（XRD） and scanning electron microscopy（SEM）.The results showed that V2O5 microcrystallites could be obtained at 500 ℃ heat treatment.The as-prepared V2O5 has（001） orientation when the calcining temperature is over 600 ℃.By DTA analysis,the synthesized activation energy is 95.81 kJ/mol.