晶粒大小对钛硅分子筛TS-1催化氧化活性的影响  

Influences of Grain Size of Titanium Silicalite-1 on its Catalytic Oxidation Activity

作　　者：易国斌[1] 郭建维[1] 王乐夫[2] 刘卅[3] 余林[1] 

机构地区：[1]广东工业大学轻工化工学院,广东广州510090 [2]华南理工大学化工系,广东广州510640 [3]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《材料科学与工程学报》2005年第3期373-376,共4页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目 (2 0 0 2 60 0 5) ;广东省基金团队项目 (42 0 530 1 )

摘　　要：采用改进后的水热晶化法合成了TS- 1分子筛 ,研究了凝胶pH值、硅源类型对TS -1分子筛晶粒度、晶化动力学及其催化氧化性能的影响。结果表明 ,选择有机硅源并采用较高的凝胶pH值有利于合成晶粒较小的TS -1分子筛。有机硅源TEOS与无机硅源的晶体生长活化能的显著差异决定了合成TS- 1分子筛晶粒度大小的不同。TS -1催化的氧化反应受分子筛孔内扩散的限制 ,晶粒越小 ,表面利用率越高 ,因而其催化氧化活性越高。Titanium silicalites-1 (TS-1) were synthesized by the modified hydrothermal crystallization. Influences of pH of synthetic pre-gel and types of silicate sources on grain size, crystallization kinetics behavior, as well as catalytic oxidation performance of TS-1 were investigated in detail. The results showed that the smaller grain size could be obtained using organic silicate source (such as TEOS) under the condition of the higher pre-gel pH value. It was the diversity of activation energies of crystal growth of organic and inorganic silicate sources that resulted in the different grain size of TS-1. Oxidation reaction catalysized by TS-1 was restricted by inner diffusion of the micro-pores of TS-1. The smaller the grain size of titanium silicalite-1, the higher the surface efficiency and the catalytic oxidation activity.

关 键 词：钛硅分子筛 晶粒度 催化氧化 

分 类 号：O643.36[理学—物理化学] TQ426[理学—化学]