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

页码：101 / 114

页数：14

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