INCAPE   05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Catalytic coating synthesized onto cordierite monolith walls. Its application to diesel soot combustion
Autor/es:
EZEQUIEL BANÚS; VIVIANA G. MILT; EDUARDO E. MIRÓ; MARIA A. ULLA
Revista:
APPLIED CATALYSIS B-ENVIRONMENTAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 132 p. 479 - 486
ISSN:
0926-3373
Resumen:
Co,Ba,K/ZrO2 coating onto a cordierite monolith was produced using a sequential process. The first step
involved the formation of a ZrO2 layer using a colloidal suspension and the second, the incorporation of
active metals. The coating morphology and its physicochemical properties were studied using different
characterization techniques. The ZrO2 colloidal suspension and the active ingredients, Co, Ba and K, penetrated
through the macropores of the cordierite and their interconnections, both being retained inside
the walls and on the external surface. After calcination, the active species were BaCO3, KNO3 and Co3O4.
The catalytic performance for diesel soot combustion was analyzed through the loose deposition of
soot onto the structured catalyst and the TPO experiments showed a maximum in combustion rate at
about 400 ◦C when NO (0.1%) was added.
Cordierite monoliths are well known as wall-flow type soot filters and the morphology of their walls
provides an optimum substrate for the anchoring of a thin catalytic coating, thus achieving an excellent
mechanical stability. Moreover, the catalytic layer also covers internal pores of the channel walls, where
some of the soot particles are trapped, enhancing the catalytic activity and preserving most of the original
cordierite monolith macroporosity. Therefore, coating cordierite walls with a Co,Ba,K/ZrO2 catalyst constitutes
a potential catalytic filter for soot combustion. As the textural properties indicated, no changes in
the pore volume were observed after the incorporation of the catalytic coating, which favors the potential
application of this type of monoliths.