论文部分内容阅读
将Ti(SO4)2溶于稀盐酸合成酸性钛溶胶,再将其与铝溶胶和六次甲基四胺溶液混合后采用油柱成型法制备了球形TiO2-Al2O3复合氧化物。通过XRD、低温氮吸附-脱附与NH3-TPD等手段对样品进行表征,结果表明600℃焙烧得到的球形TiO2-Al2O3中TiO2以无定型形式存在;随TiO2含量的增加,球形TiO2-Al2O3的比表面积、孔容和平均孔径呈增加趋势;TiO2的引入没有对球形TiO2-Al2O3的强酸和弱酸中心的强度产生影响,弱酸中心数量显著增加,强酸中心数量稍有增加;球形TiO2-Al2O3的堆密度和压碎强度随TiO2含量的增加而减小,颗粒直径基本保持不变。
Ti (SO4) 2 was dissolved in dilute hydrochloric acid to synthesize acidic titanium sol, and then mixed with aluminum sol and hexamethylenetetramine solution. The spherical TiO2-Al2O3 composite oxide was prepared by oil column molding. The samples were characterized by XRD, low temperature nitrogen adsorption-desorption and NH3-TPD. The results showed that the TiO2 in the spherical TiO2-Al2O3 calcined at 600 ℃ exists in an amorphous form. With the increase of TiO2 content, the spherical TiO2-Al2O3 The specific surface area, pore volume and average pore diameter increase. The introduction of TiO2 has no effect on the intensity of the strong acid and weak acid centers of the spherical TiO2-Al2O3, the number of weak acid centers increases significantly and the number of strong acid centers slightly increases. The density and crush strength decrease with the increase of TiO2 content, and the particle diameter remains basically unchanged.