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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