INVESTIGADORES
ULLA Maria Alicia Del H.
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: 2007 vol. 8 p. 765 - 769
ISSN:
1566-7367
Resumen:
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.
