The state of metals in the supported bimetallic Pt-Pd/SO4/ZrO2 system

被引：13
|
作者：
Ivanov, AV [1 ]
Stakheev, AY [1 ]
Kustov, LM [1 ]
机构：
[1] Russian Acad Sci, ND Zelinskii Organ Chem Inst, Moscow 117913, Russia
来源：
RUSSIAN CHEMICAL BULLETIN | 1999年 / 48卷 / 07期
关键词：
platinum; palladium; bimetallic systems; superacids; SO4/ZrO2; metal-support interaction; alloy formation; diffuse-reflectance FTIR spectroscopy;
D O I：
10.1007/BF02495285
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The behavior of the metals in the Pt-Pd/ZrO2 and Pt-Pd/SO4/ZrO2 systems was studied by DRIFT spectroscopy. After reduction of Pt-Pd/ZrO2 at 100 degrees C, the states of the metals are mainly Pt-0 and Pd-0 with a minor admixture of positively charged forms of Pt+ or Pd2+. An increase in the temperature of reduction leads to the formation of a bimetallic alloy. In the Pt-Pd/SO4/ZrO2 system, the effects of alloy formation and the interaction of the surface SO4 groups superimpose. At low reduction temperatures, the surface SO4 groups interact mainly with palladium. The influence of the surface sites on both supported metals increases with increasing reduction temperature.
引用
收藏
页码：1255 / 1260
页数：6
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