透射电镜原位研究Ni/C催化剂的表面形态  

The Surface Morphology Investigatin of Ni/C Catalysts by in situ Transmission Electron Microscopy

作　　者：艾子萍[1] 张景艳[2] 盛太成[2] 

机构地区：[1]山东大学实验中心 [2]山东大学化学系

出　　处：《电子显微学报》1992年第1期43-48,共6页Journal of Chinese Electron Microscopy Society

摘　　要：催化剂在使用过程中,表面形态的变化直接关系到催化剂的使用寿命,因此研究烧结、晶粒长大等问题一直是催化剂表面化学的主要课题。采用透射电镜(TEM)原位加热技术,在加热过程中,直接观察催化剂表面形态的变化,对研究烧结机理,可提供有价值的信息。本文在真空气氛下,采用这一技术,观察了在673～973K范围Ni/C催化剂表面形态的变化,发现在较低温度下(673～773K),烧结过程包含颗粒迁移和原子迁移;在高温(973K)主要发生原子迁移。The surface morphlogy changes of Ni/C catalysts at various temperature in vacuum have been observed by in situ transmission electron microscopy which have been proved tO be a useful technique for the study of sintering mechanism in the field of catalysis. The results presented here show that at lower temperature(673-773K) sinter-ing processes involved both atomic migration and particle migration mechanisms, while at higher temperature (973K) the atomic migration mechanism was predominated.

关 键 词：催化剂 Ni/C 透射电镜 原位 

分 类 号：O643.36[理学—物理化学]