热处理对氧化铝载体微观结构及物化性质的影响研究

Study on the Effect of Heat Treatment on Microstructure and Physicochemical Properties of Alumina Carrier

本文考察了焙烧温度、恒温时间、升温速率等热处理条件对其所得γ-Al_(2)O_(3)载体物化性质的影响。通过正交试验分析,热处理条件中焙烧温度对氧化铝粉体粒度影响最大,因此重点研究了焙烧温度对氧化铝载体微观结构与物化性质的影响。制备γ-Al_(2)O_(3)的最优条件:焙烧温度为800℃,恒温时间为5 h,升温速率为50℃/h。其微观结构形状为规则的片层结构,表面形貌为球形颗粒聚集的片层形状,微晶粒子尺寸为6 nm,平均孔径为12 nm,孔径分布主要集中在7 nm,(110)晶面暴露比例较多,B酸酸量较高,为0.13 mmol/g。

The effects of calcination temperature,constant temperature time and heating rate on the physico-chemical properties ofγ-Al_(2)O_(3)support were investigated.The orthogonal test results show that the calcination temperature has the greatest effect on the particle size of alumina,so the effect of calcination temperature on the microstructure and physicochemical properties of alumina carrier is studied.The optimal conditions for preparingγ-Al_(2)O_(3)were calcination temperature of 800°C,constant temperature of 5 H and heating rate of 50°C/H.Its microstructure is regular lamellar structure,the surface morphology is lamellar shape of spherical particles,the size of microcrystal particles is 6nm.The average pore size is 12 nm,the pore size distribution is mainly concentrated at 7nm,the(110)crystal surface is exposed more,the content of B acid is higher,is 0.13 mmol/g.