Contribution of cerium/zirconium mixed oxides to the activity of a new generation of TWC

被引：109
|
作者：
González-Velasco, JR
Gutiérrez-Ortiz, MA
Marc, JL
Botas, JA
González-Marcos, MP
Blanchard, G
机构：
[1] Univ Basque Country, Fac Ciencias, EHU, Dept Engn Quim, E-48080 Bilbao, Spain
[2] Rhone Poulenc Rech, F-93308 Aubervilliers, France
来源：
APPLIED CATALYSIS B-ENVIRONMENTAL | 1999年 / 22卷 / 03期
关键词：
ceria; zirconia; mixed oxides; three way catalysts (TWC);
D O I：
10.1016/S0926-3373(99)00054-5
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 catalytic activity of several cerium/zirconium mixed oxides for TWC applications has been investigated with the aim of optimising the Ce/Zr composition. Their catalytic activity was surprisingly high, considering that no noble metal was present in the composition, particularly for oxidation reactions (CO and C3H6), while their reduction activity was very small (NO). The specific activity of the mixed oxides for CO and C3H6 was found to be the contribution of the individual specific activity of the single oxides. The best activity in practice (lowest T-0 and T-50 and highest X-773) was found for the mixed oxide with a Ce/Zr ratio of 80/20, as a combination of its high specific activity and the highest specific surface area. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：167 / 178
页数：12
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