Multiscale numerical modeling of solid particle penetration and hydrocarbons removal in a catalytic stripper

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The catalytic stripper has emerged as a technology for removal of semi-volatile material from aerosol streams for automotive and aerospace emissions measurements, including portable solid particle emissions measurements governed by the Real Driving Emissions (RDE) regulations. This study employs coupled energy and mass transfer models to predict solid particle penetration and hydrocarbons removal for various configurations of a catalytic stripper. The continuum-scale macro model applies mass, momentum and energy conservation for the inlet heating region of a catalytic stripper whereby the catalyst monolith is represented by a porous medium. The particles and species dynamics inside the catalytic monolith were computed by coupled microsimulations of the monolith channel using boundary conditions from the macro model. The results from the numerical simulations were validated with corresponding experimental data and employed for a parametric study in terms of flow rate and catalyst length with a view to optimising the operating condition. Results of the simulation and experiment show that solid particle penetration through the catalytic stripper can exceed ~60% for particles at 10 nm mobility diameter and hydrocarbons removal of >95% for an optimized catalytic stripper device.

Matti Maricq
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Aerosol Science and Technology
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Informa UK Limited
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European Commission Horizon 2020 (H2020) Societal Challenges (724145)
Engineering and Physical Sciences Research Council (EP/R035199/1)
This work was supported by Portable Nano-Particle Emission Measurement System (PEMs4Nano) project from European Union’s Horizon 2020 research and innovation programme (Grant Agreement no. 724145) and Innovate UK (project ref: 103304). Additional support was provided by the Engineering and Physical Sciences Research Council Centre for Sustainable Road Freight (EP/R035199/1). Catalytic Instruments GmbH & Co.KG provided the catalytic strippers used and technical guidance associated with changing lengths.