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

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

Journal of Environmental Chemical Engineering

Elsevier BV

Año: 2019

2213-3437

Stackedstainless steel wire mesh monoliths were developed as supports for Pt/Co,Cecatalysts for diesel exhaust treatment. After the calcination of the metalstructures at 900°C, a Co,Ce layer was deposited over the meshes by means of anequimolar suspension of Co3O4 and CeO2nanoparticles, followed by the incorporation of 1 wt.% Pt. Also, a double bedcatalyst configuration was studied: a Pt,CeO2 pre-filter dieselcatalyst oxidation (DOC) was developed to efficiently oxidize NO to NO2which helps in regenerating the accumulated soot within the Co,Ce catalyzed dieselparticulate filter (DPF). The catalytic monoliths, both as single and doublebed configurations, were evaluated for the simultaneous combustion of volatile organiccompounds (ethyl acetate, n-hexane ortoluene) and soot. Co,Ce and Pt/Co,Ce structures presented similar catalyticactivities, with a maximum soot combustion rate at 420°C,  whereas this value decreased to 400°C for thedouble bed catalyst. Catalytic experiments with or without gaseous O2or NO in the feed were carried out to ascertain the role of the catalyticcomponents. The structured and powder catalysts were characterized by X-raydiffraction (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 pressuredrop of the catalytic structures was measured.