Modelling of Mass Transfer Resistances in Non-uniformly Washcoated Monolith Reactors
Journal article, 2021

There are various methodologies to account for mass transfer within non-uniformly distributed washcoats in monolith reactors in 1D models (axially). However, 1+1D models (axially/radially) fail to capture local variations in mass transfer from different coating thicknesses or cracks. In this paper, we present a novel way to account for local material properties in a washcoated monolith reactor. The suggested method uses an existing 1+1D modelling framework and sectionalizes the washcoat into multiple tangential segments which are solved independently. Intelligent gravimetric analysis and scanning electron microscopy are used in combination to calculate local effective diffusivity as an input for each simulation. The new model is compared to the original 1+1D model using NO light-off simulations. The new model predicted increased conversion at elevated temperatures, where mass transfer limitations are present, due to the higher porosity in the corners. The simulation time for each model was similar due to the parallelizable nature of the new model.

Pore diffusion

Catalytic washcoat

Non-uniformity

Sectionalizing

Parallel computing

Author

Magnus Walander

Chalmers, Mechanics and Maritime Sciences, Combustion and Propulsion Systems, Engines and Propulsion Systems

Jonas Sjöblom

Chalmers, Mechanics and Maritime Sciences, Combustion and Propulsion Systems, Engines and Propulsion Systems

Derek Creaser

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Process and Reaction Engineering

B. Agri

Volvo Cars

N. Löfgren

Volvo Cars

Stefanie Tamm

Johnson Matthey AB

J. Edvardsson

Johnson Matthey AB

Emission Control Science and Technology

21993629 (ISSN) 21993637 (eISSN)

Vol. 7 2 153-162

Subject Categories

Applied Mechanics

Other Physics Topics

Bioinformatics (Computational Biology)

DOI

10.1007/s40825-020-00178-8

More information

Latest update

8/17/2021