含钛复合载体的制备与表征

摘要

The impregnation, precipitation and co — precipitation methods were adopted to prepare the composite supports with titanium, and pore structure and surface acid properties of the synthesized samples were characterized by XRD, N2 adsorption— desorption, TEM, and Py — IR. The results show that the different prepared methods have an effect on the structure of composite supports with titanium, γ—AI2O3 in samples prepared by co—precipitation method showed the uniform spherical particles, but not the fiber structure. The BET surface area and porous volume and the amount of acidity of the composite supports prepared by co—precipitation are the lowest. Moreover, the surface of composite supports with titanium contained only L acid sites.%采用浸渍法、沉淀法和共沉淀法制备了含钛复合载体,并采用XRD、N2吸附-脱附、TEM和Py-IR对所制得样品的孔结构和表面酸性能进行了表征.结果表明,制备方法对含钛复合载体的存在形态有一定的影响；共沉淀法生成的含钛复合载体与γ-Al2O3的纤维状结构不同,呈均匀的球状微粒；共沉淀法制备的含钛复合载体的比表面积和孔容较小；含钛复合载体表面只有L酸位,且共沉淀法制备的含钛复合载体的酸性最弱.