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利用溶胶凝胶法在SBA-15介孔氧化硅表面嫁接上氧化锆,再经硫酸化处理后制备得到具有高比表面积,均一介孔孔道的硫酸化氧化锆复合催化材料。利用小角XRD、XRD、氮气吸脱附、透视电镜等对材料进行表征。SAXRD结果表叫:该材料具有介孔结构:XRD结果表明氧化锆在介孔氧化硅上均匀分散,高温焙烧后没有单斜相生成;氮气吸脱附结果表明SBA-15氧化硅材料的具有820 m~2·g~(-1)的比表面积,经过嫁接和硫酸化等步骤后,比表面积有所下降,但其具有良好的高温稳定性,800℃焙烧后比表面积保持在556 m~2.g~(-1);TEM结果表面复合材料上介孔的有序分布。将该复合催化材料应用于甲苯和甲醛缩合制备二甲苯甲烷结果表面500℃C焙烧后的催化剂具有最好的反应性能。
Zirconia was grafted on the surface of SBA-15 mesoporous silica by sol-gel method and then sulfated zirconia composite catalyst material with high specific surface area and uniform mesopore was prepared by sulfating. The materials were characterized by XRD, XRD, nitrogen adsorption and desorption, and TEM. SAXRD results table: This material has a mesoporous structure: XRD results show that zirconia uniformly dispersed on the mesoporous silica, no monoclinic phase after high temperature calcination; nitrogen adsorption and desorption results show that the SBA-15 silicon oxide material with 820 The specific surface area of m ~ 2 · g ~ (-1) decreased with the decrease of specific surface area after grafting and sulfation. However, its specific surface area kept at 556 m ~ 2 after calcination at 800 ℃ .g ~ (-1); TEM results ordered distribution of mesopores on the surface composites. The composite catalytic material was applied to the condensation reaction of toluene and formaldehyde to prepare xylene methane. The surface of the catalyst after calcination at 500 ℃ had the best reaction performance.