Efficient Experimental Approach to Evaluate Mass Transfer Limitations for Monolithic DOCs
Journal article, 2019

The diesel oxidation catalyst (DOC, Pt/γ-Al2O3) was used in a synthetic-gas catalyst test bench to study internal mass transfer limitations during NO oxidation. A simple and fast experimental methodology, by varying the washcoat thickness in monolithic DOCs was developed and the results were evaluated using various experimental time scales. The ratio between the reaction time constant and the washcoat diffusion time constant was useful in identifying temperatures where the DOCs tested transitioned between a kinetically controlled region and an internal mass transfer controlled region. The NO conversion was shown to be significantly limited by internal mass transfer already at 175 °C for an average washcoat thickness of 110 µm.

NO oxidation

Internal mass transfer limitation

Diesel oxidation catalyst

Time constant

Catalytic Washcoat

Author

Magnus Walander

Chalmers, Mechanics and Maritime Sciences, Combustion and Propulsion Systems

Jonas Sjöblom

Chalmers, Mechanics and Maritime Sciences, Combustion and Propulsion Systems

Derek Creaser

Competence Centre for Catalysis (KCK)

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Stefanie Tamm

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

Björn Lundberg

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

Topics in Catalysis

1022-5528 (ISSN) 1572-9028 (eISSN)

Vol. 62 1-4 391-396

Emission control by validated catalytic reactor modelling

Swedish Energy Agency, 2017-01-01 -- 2020-12-31.

The Competence Centre for Catalysis, KCK

Johnson Matthey AB, 2018-01-01 -- 2021-12-31.

Volvo Group, 2018-01-01 -- 2021-12-31.

Chalmers, 2018-01-01 -- 2021-12-31.

Volvo Cars, 2018-01-01 -- 2021-12-31.

Swedish Energy Agency, 2018-01-01 -- 2021-12-31.

Scania CV AB, 2018-01-01 -- 2021-12-31.

Umicore AG & Co KG, 2018-01-01 -- 2021-12-31.

ECAPS AB, 2018-01-01 -- 2021-12-31.

Preem, 2018-01-01 -- 2021-12-31.

Subject Categories

Mineral and Mine Engineering

Chemical Process Engineering

Other Chemical Engineering

Driving Forces

Sustainable development

Areas of Advance

Transport

Roots

Basic sciences

DOI

10.1007/s11244-018-1111-2

More information

Latest update

2/8/2021 6