Soot oxidation on a catalytic NOx trap:: Beneficial effect of the Ba-K interaction on the sulfated Ba,K/CeO2 catalyst

被引：27
作者：
Milt, V. G. [1 ]
Peralta, M. A. [1 ]
Ulla, M. A. [1 ]
Miro, E. E. [1 ]
机构：
[1] UNL, CONICET, Inst Invest Catalisis & Petroquim, RA-3000 Santiago Del Estero, Santa Fe, Argentina
来源：
CATALYSIS COMMUNICATIONS | 2007年 / 8卷 / 05期
关键词：
Ba; K/CeO2; catalysts; Ba-K interaction; NOx traps; diesel soot combustion; sulfur poisoning;
D O I：
10.1016/j.catcom.2006.09.011
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 Ba,K/CeO:, catalyst is active both for NOx trapping and soot combustion. In this work we report a Ba- K interaction that prevents K sulfation when NO, is present, thus preserving the activity of K towards soot combustion during the working period of the trap. This effect is originated in the K2SO4(s) + Ba(NO3)(2)(s) -> 2KNO(3)(s) + BaSO4(s) reaction, which is thermodynamically favored. In the absence of NOx the soot combustion reaction is strongly depressed by SO2 whereas when NOx is present both the sulfated and the non-sulfated catalysts present similar TPO patterns. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：765 / 769
页数：5
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