Efficient Experimental Approach to Evaluate Mass Transfer Limitations for Monolithic DOCs
Journal article, 2018

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.

Diesel oxidation catalyst

NO oxidation

Time constant

Catalytic Washcoat

Internal mass transfer limitation

Author

Magnus Walander

Chalmers, Mechanics and Maritime Sciences, Combustion

Jonas Sjöblom

Chalmers, Mechanics and Maritime Sciences, Combustion

Derek Creaser

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Chemical Engineering Design

Competence Centre for Catalysis (KCK)

Stefanie Tamm

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

Björn Lundberg

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

Topics in Catalysis

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

Vol. 62 1-4 391-396

The Competence Centre for Catalysis, KCK

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

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

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

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

Volvo Car Corporation, 2018-01-01 -- 2021-12-31.

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

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

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

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

Emission control by validated catalytic reactor modelling

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

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

7/21/2019