球形氧化铝载体结构优化

Optimization of Spherical Alumina Support Structure

将拟薄水铝石与适量硝酸混合,形成溶胶溶液,滴入油-盐柱中固化后形成球形氧化铝凝胶,通过调节老化温度、时间以及增加水蒸气处理过程,成功制备出大可几孔径、高机械强度、酸性适宜的球形氧化铝载体。利用N_(2)吸附-脱附、颗粒机械强度测试、NH3-TPD、XRD等表征方法研究了老化前后以及水蒸气处理过程中,球形氧化铝孔结构、机械强度、表面酸性、晶相结构的变化规律,并确定最佳老化时间在4 h左右,最佳二段水蒸气处理时间在6 h左右。

The pseudo-boehmite was mixed with an appropriate amount of nitric acid to form a sol solution,which was dropped into the oil-salt column and solidified to form a spherical alumina gel.The spherical alumina support with large pore size,high mechanical strength and suitable acidity was successfully prepared by adjusting the aging temperature and time and adding the steam treatment process.The changes of pore structure,mechanical strength,surface acidity and phase structure of spherical alumina before and after aging and during steam treatment were studied by N_(2)adsorption-desorption,particle mechanical strength test,NH3-TPD and XRD.The optimal aging time was about 4 h,and the optimal second-stage steam treatment time was about 6 h.