Effect of periodic operation over Pt catalysts in simulated oxidizing exhaust gas

被引：93

作者：

Shinjoh, H ^{[1
]}

Takahashi, N ^{[1
]}

Yokota, K ^{[1
]}

Sugiura, M ^{[1
]}

机构：

[1] Toyota Cent Res & Dev Labs Inc, Aichi 48011, Japan

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 1998年 / 15卷 / 3-4期

关键词：

platinum/alumina; barium; exhaust catalyst; periodic operation effect; NOx reduction;

D O I：

10.1016/S0926-3373(97)00046-5

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 effect of periodic operation over Pt and Pt/Ba catalysts supported on gamma-alumina under oxidizing conditions was investigated using simulated automotive exhaust gas from lean-burn combustion. The conversion of hydrocarbons and NOx was measured in cycled feedstream and steady feedstream under oxidizing conditions. The activities of the catalysts were improved in the cycled feedstream between oxidizing and reducing atmospheres under average oxidizing conditions. In particular, the NOx reduction on the Pt/Bt catalyst was higher than that on the Pt catalyst in the cycling operation. From the mass spectral analysis in streams of NO-O-2-C3H6 and NO-O-2-H-2 (balance He) gas, it was found that NO was oxidized and stored on the Pt/Ba catalyst under oxidizing conditions, and that the stored NOx on the catalyst was subsequently reduced to N-2 under reducing conditions. (C) 1998 Elsevier Science B.V.

引用

页码：189 / 201

页数：13

共 25 条

[1] MECHANISM OF THE SELECTIVE REDUCTION OF NITROGEN MONOXIDE ON PLATINUM-BASED CATALYSTS IN THE PRESENCE OF EXCESS OXYGEN [J].