The reaction of ethylene on a model automotive emissions control catalyst

被引：12
|
作者：
Ferrizz, RM [1 ]
Egami, T
Vohs, JM
机构：
[1] Univ Penn, Dept Chem Engn, Philadelphia, PA 19104 USA
[2] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA
来源：
CATALYSIS LETTERS | 1999年 / 61卷 / 1-2期
关键词：
ceria; emissions control; Rh; ethylene;
D O I：
10.1023/A:1019012619924
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：
The reaction of ethylene on a model automotive emissions control catalyst consisting of Rh particles on an epitaxial ceria film grown on the (100) surface of an yttria-stabilized zirconia single crystal was studied using TPD. The TPD results showed that ethylene undergoes dehydrogenation on the model catalyst at temperatures below 500 K depositing carbon on the Rh particles. Surface carbon formed in this manner was oxidized to CO upon heating to above 550 K using oxygen supplied by the ceria lattice. Heating to 900 K was found to induce reduction of the ceria film resulting in a marked decrease in oxidation activity.
引用
收藏
页码：33 / 38
页数：6
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