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THE THERMOSTABILIZING EFFECT OF LANTHANUM ON GAMMA-AL2O3 STUDIED BY LOW-ENERGY ION-SCATTERING

被引：13
作者：
VANLEERDAM, GC
BRONGERSMA, HH
TIJBURG, IIM
GEUS, JW
机构：
[1] EINDHOVEN UNIV TECHNOL,SCHUIT INST CATALYSIS,5600 MB EINDHOVEN,NETHERLANDS
[2] UNIV UTRECHT,DEPT INORGAN CHEM,3584 CA UTRECHT,NETHERLANDS
来源：
APPLIED SURFACE SCIENCE | 1992年 / 55卷 / 01期
关键词：
D O I：
10.1016/0169-4332(92)90376-9
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：
Low-energy ion scattering has been used to study the surface of lanthanum thermostabilized gamma-Al2O3 during several stages of the sintering process. Deposition of lanthanum onto the support by specific adsorption of a [La(EDTA)]- complex turns out to be homogeneous. After calcination at 550-degrees-C La2O3 particles have been formed on the surface, while LEIS results after sintering at 1050-degrees-C indicate the formation of a lanthanum-aluminate surface layer. The presence of lanthanum prevents transformation of gamma-Al2O3 to alpha Al2O3 at 1050-degrees-C.
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页码：11 / 18
页数：8
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