Single and double bed stacked wire mesh cartridges for the catalytic treatment of diesel exhausts

GODOY, MARÍA LAURA; MIRÓ, EDUARDO ERNESTO; MILT, VIVIANA GUADALUPE; BANÚS, EZEQUIEL DAVID; MIRÓ, EDUARDO ERNESTO; BANÚS, EZEQUIEL DAVID; GODOY, MARÍA LAURA; MILT, VIVIANA GUADALUPE

Journal of Environmental Chemical Engineering

Elsevier Ltd

Lugar: Amsterdam; Año: 2019 vol. 7 p. 103290 - 103299

2213-3437

Stacked stainless steel wire mesh monoliths were developed as supports for Pt/Co,Ce catalysts for diesel exhaust treatment. After the calcination of the metal structures at 900 °C, a Co,Ce layer was deposited over the meshes by means of an equimolar suspension of Co3O4 and CeO2 nanoparticles, followed by the incorporation of 1 wt.% Pt. Also, a double bed catalyst configuration was studied: a Pt,CeO2 pre-filter diesel catalyst oxidation (DOC) was developed to efficiently oxidize NO to NO2 which helps in regenerating the accumulated soot within the Co,Ce catalyzed diesel particulate filter (DPF). The catalytic monoliths, both as single and double bed configurations, were evaluated for the simultaneous combustion of volatile organic compounds (ethyl acetate, n-hexane or toluene) and soot. Co,Ce and Pt/Co,Ce structures presented similar catalytic activities, with a maximum soot combustion rate at 420 °C, whereas this value decreased to 400 °C for the double bed catalyst. Catalytic experiments with or without gaseous O2 or NO in the feed were carried out to ascertain the role of the catalytic components. The structured and powder catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET), energy dispersive X-ray spectroscopy (EDX) and Laser Raman spectroscopy. The catalyst coating adherence was confirmed by ultrasound tests and the pressure drop of the catalytic structures was measured.