Sulfur deactivation of Pt/SiO2, Pt/BaO/Al2O3, and BaO/Al2O3 NOx storage catalysts:: Influence of SO2 exposure conditions

被引：46

作者：

Dawody, J ^{[1
]}

Skoglundh, M

Olsson, L

Fridell, E

机构：

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

[2] Chalmers Univ Technol, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[3] Chalmers Univ Technol, Dept Chem & Biol Engn, SE-41296 Gothenburg, Sweden

来源：

JOURNAL OF CATALYSIS | 2005年 / 234卷 / 01期

关键词：

NOx storage catalysts; sulfur deactivation; Pt; BaO; Al2O3; SiO2; SO2;

D O I：

10.1016/j.jcat.2005.05.017

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：

Flow reactor experiments were performed to study the effect Of SO2 + O-2 and SO2 + H-2 exposures on the NOx storage performance of Pt/BaO/Al2O3 and BaO/Al2O3 catalysts. In addition, Pt/SiO2 samples were used to study the interaction between Pt and SO2 under the two exposure conditions. For BaO/Al2O3 the two SO2 exposure conditions caused similar deactivation of the NO, storage capacity, whereas for Pt/BaO/Al2O3 the decline in the NOx storage capacity was faster during the SO2 + H-2 exposure than for SO2 + O-2 exposure. The presence of Pt enhances the adsorption Of SO2 for both SO2 exposure conditions. Quantitative analysis of sulfur showed that exposure to SO2 + O-2 caused higher accumulation of sulfur in Pt/BaO/Al2O3 samples in comparison with SO2 + H-2 exposure. Thus there is no correlation between the total amount of adsorbed sulfur in the samples and the reduction of the NOx storage capacity, probably because of the adsorption of sulfur on sites not necessarily important for the NOx storage process. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：206 / 218

页数：13

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