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分别以钛酸四丁酯及SBA-15为钛源和载体,采用直接嫁接法制备不同负载量的Ti-SBA-15复合材料,并采用XRD、FT-IR、BES、HRTEM、N2吸脱附及XPS分析其微结构。结果表明:制备的Ti-SBA-15具有高的比表面积(452～617m2/g)均匀的孔径分布(7.3～7.8nm)及大的孔容(0.79～1.05cm3/g),且嫁接的TiO2颗粒呈椭圆形,长粒径约为6～8nm,而短粒径仅为4nm,且具有高分散性。同时,探讨了Ti-SBA-15的形成机理,其制备过程包括:(a)钛前驱体的高度分散,(b)钛前驱体在硅羟基上的嫁接,(c)焙烧形成Si-O-Ti键,从而实现SBA-15上Ti的嫁接。
The Ti-SBA-15 composites with different loadings were prepared by direct grafting using tetrabutyl titanate and SBA-15 as the titanium source and carrier respectively. XRD, FT-IR, BES, HRTEM and N2 adsorption and desorption And XPS analysis of its microstructure. The results show that the prepared Ti-SBA-15 has a uniform pore size distribution (7.3-7.8nm) and a large pore volume (0.79-1.05cm3 / g) with a high specific surface area (452-617m2 / g) Particles are oval, long diameter of about 6 ~ 8nm, and short diameter of only 4nm, and has high dispersion. Meanwhile, the formation mechanism of Ti-SBA-15 was discussed. The preparation process includes: (a) high dispersion of titanium precursor, (b) grafting of titanium precursor on silanol groups, (c) calcination to form Si- Ti bond in order to achieve the grafting of Ti on SBA-15.