论文部分内容阅读
采用激光粒度仪测定氧化铜粉体试样的粒度分布,利用透射电镜(TEM)观察表征其形貌。在含氢25%的氢氮混合气流中,在不同的升温速率(2.5、5、10、12.5、17.5、25K/min)下,利用微机差热天平进行非等温的热重分析实验,测定样品的TG-DTA曲线。研究结果表明,氧化铜粉体样品结构不规则,粒径分布较宽,粒径约为9.4μm;TG曲线的起始反应温度和DTA曲线的峰值温度均随着升温速率的增大而增大;氢气还原氧化铜粉体为单质铜的表观活化能为59.42kJ/mol,指前因子为6.75×105min-1,反应级数为1.08。
The particle size distribution of copper oxide powder was measured by laser particle size analyzer. The morphology was characterized by transmission electron microscopy (TEM). In a hydrogen-nitrogen mixed gas stream containing 25% hydrogen, non-isothermal thermogravimetric analysis was carried out at different heating rates (2.5, 5, 10, 12.5, 17.5 and 25 K / min) TG-DTA curve. The results show that the samples of copper oxide powder have an irregular structure and a wide particle size distribution with a particle size of about 9.4 μm. The initial temperature of TG curve and the peak temperature of DTA curve increase with increasing heating rate ; The apparent activation energy of copper oxide powder for hydrogen reduction is 59.42kJ / mol, the pre-exponential factor is 6.75 × 105min-1 and the reaction order is 1.08.