Improvement of thermal stability of alumina by addition of zirconia

被引：30

作者：

Horiuchi, T ^{[1
]}

Teshima, Y ^{[1
]}

Osaki, T ^{[1
]}

Sugiyama, T ^{[1
]}

Suzuki, K ^{[1
]}

Mori, T ^{[1
]}

机构：

[1] Natl Ind Res Inst Nagoya, Kita Ku, Nagoya, Aichi 4628510, Japan

来源：

CATALYSIS LETTERS | 1999年 / 62卷 / 2-4期

关键词：

alumina; surface area; phase transformation; zirconia; thermal stability;

D O I：

10.1023/A:1019051123075

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：

To maintain a large surface area at elevated temperatures, zirconia was added to transition alumina. The addition of a small amount of zirconia resulted in a marked suppression of phase transformation from theta- to alpha-alumina. After heating at 1200(degrees)C, ZrO2-containing alumina exhibited a large surface area of 50 m(2)/g. UV-VIS and XRD measurements indicated that zirconia existed in a high dispersion state after calcining at 800(degrees)C. XPS measurement also showed that zirconia existed as monolayer. Zirconia monolayers are concluded to cover the alumina surface and the interaction between them may be the cause for the suppression of phase transformation and also for the maintenance of the large surface area at elevated temperatures. The interaction remains up to 1200(degrees)C, therefore, theta phase remained at 1200(degrees)C.

引用

页码：107 / 111

页数：5

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