摘要
以碳酸氢铵为沉淀剂,廉价的硫酸铝、硫酸钛为原料,采用液相共沉淀法制备了不同TiO2质量分数（0～15％）的TiO2/γ-Al2O3复合载体.运用X射线衍射（XRD）、N2吸附脱附（BET）、电子显微镜扫描（SEM）方法对所制得的复合载体进行了表征.结果显示,当TiO2/γ-Al2O3复合载体中TiO2的质量分数逐渐增大到15％时,其中的TiO2由无定型高度分散态转变为锐钛矿晶型开始在γ-Al2O3上富集,复合载体中γ-Al2O3的存在提高了TiO2的热稳定性;采用此方法制得的TiO2/γ-Al2O3复合载体比表面积较高,具有介孔（2～50 nm）-大孔（＞50 nm）双孔分布的多级孔结构,最可几孔径在7～11 nm之间;TiO2/γ-Al2O3复合载体二次粒子形貌为短粗纤维状.
With ammonium bicarbonate as precipitant,low cost alumina salt and titanium salt as raw material,TiO2/γ-Al2O3 composite supports with different mass fractions（0-15％） of TiO2 were prepared by liquid phase co-precipitation method,and were characterized by X-ray diffraction （XRD）,N2 adsorption-desorption （BET） and scanning electron microscope （SEM）.The results showed that TiO2 in TiO2/γ-Al2O3 composite support changed from amorphous dispersed state to anatase phase with the increase of TiO2mass fraction to 15％ and enriched on γ-Al2O3 surface.Due to the exist of γ-Al2O3 in the composite,the transformation temperature of TiO2 rose and its thermal stability was improved.The TiO2/γ-Al2O3 composite supports prepared by this method possessed a meso（2-50 nm）-macroporous（＞50 am） hierarchical porous structure with a high specific surface area and the average pore size between 7 nm to 11 nm.The secondary particles of TiO2/γ-Al2O3 composite support exhibited a short and coarse fibre-like morphology.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2013年第5期785-790,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
