MECHANISM OF SURFACE SPREADING IN VANADIA-TITANIA SYSTEM

被引：55
|
作者：
HABER, J [1 ]
MACHEJ, T [1 ]
SERWICKA, EM [1 ]
WACHS, IE [1 ]
机构：
[1] LEHIGH UNIV,ZETTLEMOYER CTR SURFACE STUDIES,BETHLEHEM,PA 18015
来源：
CATALYSIS LETTERS | 1995年 / 32卷 / 1-2期
关键词：
VANADIA-TITANIA; SURFACE SPREADING; SOLID SOLID WETTING; V2O5/TIO2;
D O I：
10.1007/BF00806105
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Spreading of vanadia over TiO2 (anatase) supports of different specific surfaces has been investigated by XRD, XPS and ESR. It has been found that vanadia migration is favoured over well-developed anatase crystal planes. At 723 K spontaneous spreading takes place, controlled by diffusion of vanadium species through the vanadia monolayer. In reducing atmosphere an induction period is observed, possibly initiated by formation of a structurally modified titania surface layer. Amorphous vanadia is postulated as a transient form between crystalline V2O5 and the vanadia monolayer.
引用
收藏
页码：101 / 114
页数：14
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