Ultrasound-Assisted Deposition of Co–CeO 2 onto Ceramic Microfibers to Conform Catalytic Papers: Their Application in Engine Exhaust Treatment

BANÚS, EZEQUIEL D.; MIRÓ, EDUARDO E.; SACCO, NICOLÁS A.; MILT, VIVIANA G.; BORTOLOZZI, JUAN P.

ACS Omega

American Chemical Society

Lugar: Washington; Año: 2018 vol. 3 p. 18334 - 18342

2470-1343

The combination of the selective catalyticreduction technology with catalytic filters constitutes one ofthe most efficient ways for diesel engine exhaust treatment. Inthis paper, the development of catalytic ceramic papers asstructured systems for the abatement of diesel soot particles isaddressed. Ceramic papers were prepared by the dualpolyelectrolytepapermaking method, which is based on theconventional papermaking technique used for cellulosicpapers, in which a portion of cellulosic fibers is replaced byceramic ones. The deposition of Co and Ce as catalyticmaterials by the wet spray method on ceramic papers wasstudied for the development of structured catalysts using anultrasonic nebulizer and different solvents. The use ofalcohol−water solutions for the impregnation of cobalt generated smaller particles and a high dispersion of them on theceramic fibers, greater than that obtained when pure water was employed. Temperature programmed oxidation (TPO) assaysshowed that the best catalytic performance was acquired with the catalysts generated with alcohol solvents, showing a maximumrate for soot combustion at a temperature close to 400 °C. The adequate soot combustion performance and the high thermaland catalytic stability make catalytic ceramic papers impregnated by the wet spray method, promising systems for theirapplication as diesel particulate filters.