热处理时间对三氧化钼在MCM-41表面分散状态的影响  

Effect of Thermal Treatment Time on the Dispersion of MoO_3 onto the Surface of MCM-41

作　　者：李正平[1] 高濂[1] 郑珊[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050

出　　处：《无机材料学报》2002年第5期1073-1077,共5页Journal of Inorganic Materials

摘　　要：通过热处理实现了MoO3在介孔分子筛MCM-41表面的分散.用XRD和LRS研究了热处理时间对MoO3在MCM-41表面分散状态的影响,结果表明:随着热处理时间的延长,MoO3不断由聚集态转变成分散态,在m（MoO3）:m（MCM-41）=0.2:1、500℃热处理8h,就能基本实现MoO3在MCM-41表面的完全分散,而MCM-41的有序介孔结构仍然保持.BET比表面积、孔容和BJH孔径的测定结果显示在MoO3分散到MCM-41表面后MCM-41孔结构参数随热处理时间的延长变化不大.The dispersion of MoO3 onto the surface of MCM-41 was carried out by thermally treating the mixtures Of MoO3 and MCM-41. The effect of thermal treatment time on the spreading Of MoO3 onto the surface of MCM-41 support was studied by XRD and LRS. The results showed that bulk MoO3 transformed into dispersed surface polymolybdates species gradually as prolonging the treating time. The complete dispersion Of MoO3 was attained after heating for 8h at 500degreesC when M(MoO3)/m(MCM-41) was 0.2. The structure of MCM-41 was still maintained in the process of thermal treatment. BET surface areas, pore volumes and BJH pore sizes of the samples were not changed markedly as the increment of thermal treatment time, which indicated that MoO3 dispersed monolayeredly on the surface of MCM-41.

关 键 词：三氧化钼 表面分散状态 热处理时间 MOO3 MCM-41 介孔分子筛 催化剂 载体 

分 类 号：TQ426.65[化学工程]