热处理时间对三氧化钼在MCM-41表面分散状态的影响

无机材料学报

热处理时间对三氧化钼在MCM-41表面分散状态的影响

李正平; 高濂; 郑珊

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

收稿日期:2001-08-23 修回日期:2001-09-14 出版日期:2002-09-20 网络出版日期:2002-09-20

Effect of Thermal Treatment Time on the Dispersion of MoO₃ onto the Surface of MCM-41

LI Zheng-Ping; GAO Lian; ZHENG Shan

State Key Lab of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China

Received:2001-08-23 Revised:2001-09-14 Published:2002-09-20 Online:2002-09-20

摘要/Abstract

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.

关键词: 热处理时间, MoO₃, MCM-41, 分散

Abstract: 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 MoO_₃ 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 500℃
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.

Key words: thermal treatment time, MoO₃, MCM-41, dispersion

中图分类号:

TB383

李正平,高濂,郑珊. 热处理时间对三氧化钼在MCM-41表面分散状态的影响[J]. 无机材料学报.

LI Zheng-Ping,GAO Lian,ZHENG Shan. Effect of Thermal Treatment Time on the Dispersion of MoO₃ onto the Surface of MCM-41[J]. Journal of Inorganic Materials.

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