INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Soot oxidation on a catalytic NOx trap:Beneficial effect of the Ba–K interaction on the sulfated Ba,K/CeO2 catalyst
Autor/es:
V.G. MILT; M.A. PERALTA; M.A. ULLA; E.E. MIRÓ
Revista:
CATALYSIS COMMUNICATIONS
Editorial:
Elsevier
Referencias:
Año: 2006 vol. 8 p. 765 - 769
ISSN:
1566-7367
Resumen:
Abstract   The Ba,K/CeO2 catalyst is active both for NOx trapping and soot combustion. In this work we report a Ba–K interaction that prevents K sulfation when NOx 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) !2KNO3(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.