Some surface chemical features of Pt catalysts supported on Al2O3 and CeO2/Al2O3

被引：0

作者：

Magnacca, G ^{[1
]}

Cerrato, G ^{[1
]}

Morterra, C ^{[1
]}

机构：

[1] Univ Turin, Dept Chem IFM, I-10125 Turin, Italy

来源：

CATALYSIS AND AUTOMOTIVE POLLUTION CONTROL IV | 1998年 / 116卷

关键词：

D O I：

暂无

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：

Pt catalysts supported on alumina and ceria-alumina have been investigated by the adsorption/coadsorption of CO, H2O, and H-2. Gas-volumetric and FTIR spectroscopic data indicate that, on pure alumina-supported systems, multiple-vacancy sites exist that tend to be eliminated in the presence of ceria; this is attributed to a strong Pt/CeO2 interaction. In the presence of large amounts of CeO2, the catalysts are active in oxidation processes also in reducing conditions. If the alumina component of the support of Pt-containing catalysts undergoes the thermal gamma --> delta,theta-Al2O3 phase transition, all the adsorptive capacity of Pt is lost.

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页码：601 / 610

页数：10

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