A kinetic study of oxygen adsorption/desorption and NO oxidation over Pt/Al2O3 catalysts

被引：165

作者：

Olsson, L ^{[1
]}

Westerberg, B

Persson, H

Fridell, E

Skoglundh, M

Andersson, B

机构：

[1] Chalmers Univ Technol, Dept Chem Reaction Engn, SE-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Competence Ctr Catalysis, SE-41296 Gothenburg, Sweden

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 47期

关键词：

D O I：

10.1021/jp9918757

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：

Laboratory tests and kinetic modeling were carried out in order to provide kinetic input data to a systematic investigation of the mechanism of nitrogen oxides (NO,) storage in catalysts used for lean-burn engines. In particular, we present a kinetic model of the NO oxidation to NO2 over a Pt/Al2O3 model catalyst for the temperature range 250-450 degrees C. Since the oxygen behavior at atmospheric pressure is critical for such a model, we have also studied the adsorption/desorption of oxygen by temperature-programmed desorption (TPD) experiments. The experiments show that oxygen starts to desorb at about 300 degrees C. Furthermore, the NO oxidation was studied in a temperature ramp with NO and oxygen in the gas feed. The data from this experiment and the above-determined values for the oxygen adsorption/desorption were used to construct a kinetic model for the NO oxidation. Finally, the model was validated with some transient experiments with either NO or NO2 and different oxygen concentrations in the gas feed. We found a good agreement between these experiments and the model.

引用

页码：10433 / 10439

页数：7

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