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介绍了粉末状纤维氧化铝的合成方法,考察了主要制备因素对合成的影响,着重讨论了焙烧温度与晶形、晶相、表面结构等的关系,并观察了将其应用于催化反应和色谱分析中的初步结果。实验表明,当温度控制在80—98℃时,能得到直径为0.1μ的粉末状氧化铝纤维,按制备用原料的不同,其比表面为125—345m~2/g,孔体积为0.16—0.37ml/g。实验发现,焙烧温度在300—900℃范围内都是η—Al_2O_3,在1100℃时才变成α-Al_2O_3。焙烧温度对表面性质也有明显影响。应用初探表明,将其用于氢气中脱O_2,当残氧量为0.1—0.3ppm,其空速可达10×10~4ml/g·h;将其用作毛细菅色谱柱固定相以分析分离C_1—C_5气态烃时,26个峰在30min之内即可出完,柱效可达5830plate/m。
The synthesis method of powdered fibrous alumina was introduced. The influence of the main preparation factors on the synthesis was investigated. The relationship between the calcination temperature and the crystal form, crystal phase and surface structure was discussed emphatically. The catalytic reaction and chromatographic analysis In the initial results. Experiments show that when the temperature is controlled at 80-98 ℃, the powdery alumina fiber with the diameter of 0.1μ can be obtained. The specific surface area is 125-345m 2 / g and the pore volume is 0.16- 0.37 ml / g. It is found that the calcination temperature is η-Al_2O_3 in the range of 300-900 ℃, and it becomes α-Al_2O_3 only at 1100 ℃. The calcination temperature also has a significant effect on the surface properties. The preliminary application shows that it can be used for desorption of hydrogen in hydrogen and its space velocity can reach 10 × 10 ~ 4ml / g · h when the amount of residual oxygen is 0.1-0.3ppm; it can be used as a capillary column stationary phase for analysis When separating C_1-C_5 gaseous hydrocarbons, 26 peaks can be discharged within 30min, and the efficiency reaches 5830plate / m.