Comparison of catalytic activity and selectivity of Pd/(OSC+Al2O3) and (Pd+OSC)/Al2O3 catalysts

被引：22

作者：

Kolli, T

Rahkamaa-Tolonen, K

Lassi, U

Savimäki, A

Keiski, RL

机构：

[1] Oulu Univ, Dept Proc & Environm Engn, FIN-90014 Oulu, Finland

[2] ECOCAT Oy, Catalyst Res, FIN-90650 Oulu, Finland

[3] Cent Ostrobothnia Polytech, Dept Technol, FIN-67100 Kokkola, Finland

来源：

CATALYSIS TODAY | 2005年 / 100卷 / 3-4期

关键词：

Al2O3; ceria-zirconia mixed oxides; DeNO(x); nitrogen oxides; palladium; three-way catalysts;

D O I：

10.1016/j.cattod.2004.09.064

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The effect of the I'd addition method into the fresh Pd/(OSC + Al2O3) and (Pd + OSC)/Al2O3 catalysts (OSC material = CexZr1-xO2 mixed oxides) was investigated in this study. The CO + NO and CO + NO + O-2 model reactions were studied over fresh and aged catalysts. The differences in the fresh catalysts were insignificant compared to the aged catalysts. During the CO + NO reaction, only small differences were observed in the behaviour of the fresh catalysts. The light-off temperature of CO was about 20 degrees C lower for the fresh Pd/(OSC + Al2O3) catalyst than for the fresh (Pd + OSC)/Al2O3 catalyst during the CO + NO + O-2 reaction. For the aged catalysts lower NO reduction and CO oxidation activities were observed, as expected. Pd on OSC-containing alumina was more active than I'd on OSC material after the agings. The activity decline is due to a decrease in the number of active sites on the surface, which was observed as a larger I'd particle size for aged catalysts than for fresh catalysts. In addition, the oxygen storage capacity of the aged Pd/(OSC + Al2O3) catalyst was higher than that of the (Pd + OSC)/Al2O3 catalyst. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：297 / 302

页数：6

共 17 条

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