Use of 3D-printed mixers in laboratory reactor design for modelling of heterogeneous catalytic converters
Journal article, 2021

A method for identifying radial concentration maldistribution in synthetic catalyst activity test (SCAT) benches, is presented, where spatially resolved concentration measurements are not available. The developed methodology was successfully tested for an injection-based SCAT. To resolve the radial concentration maldistribution a static mixer was designed, 3D-printed and inserted upstream the test sample. The methodology could also prove the effectiveness of the mixer, which did not only resolve the concentration maldistribution but also avoided causing reaction disturbances. The resulting increased axial dispersion from the turbulence created by the static mixer was evaluated using a 3D CFD model in Ansys Fluent 19. The axial dispersion of the injection-based SCAT bench was compared to a premixed SCAT bench through classical Aris-Taylor calculations. The results from the axial dispersion calculations show that the injection-based design with the use of a static mixer is far superior to the premixed design – both with regards to pulse broadening but also time delay. This is highly desirable for modelling studies towards zero emission exhaust aftertreatment.

Radial mixing

Reactor design

Step experiment

Static mixer


Axial dispersion


Magnus Walander

Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems

Andreas Nygren

Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems

Jonas Sjöblom

Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems

Emil Johansson

RISE Research Institutes of Sweden

Derek Creaser

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

J. Edvardsson

Johnson Matthey AB

Stefanie Tamm

Johnson Matthey AB

Björn Lundberg

Volvo Cars

Chemical Engineering and Processing: Process Intensification

0255-2701 (ISSN)

Vol. 164 108325

Emission control by validated catalytic reactor modelling

Swedish Energy Agency (2016-006185,P42814-1), 2017-01-01 -- 2020-12-31.

Subject Categories

Chemical Engineering



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