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

页码：765 / 769

页数：5

共 11 条

[1] Experimental study of the SO2 removal over a NOx trap catalyst [J].