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 (M2), Combustion and Propulsion Systems
Jonas Sjöblom
Chalmers, Mechanics and Maritime Sciences (M2), Combustion and Propulsion Systems
Derek Creaser
Competence Centre for Catalysis (KCK)
Chalmers, Chemistry and Chemical Engineering, Chemical Technology
Stefanie Tamm
Chalmers, Chemistry and Chemical Engineering, Chemical Technology
Björn Lundberg
Chalmers, Chemistry and Chemical Engineering, Chemical Technology
Topics in Catalysis
1022-5528 (ISSN) 1572-9028 (eISSN)
Vol. 62 1-4 391-396Emission control by validated catalytic reactor modelling
Swedish Energy Agency (2016-006185,P42814-1), 2017-01-01 -- 2020-12-31.
The Competence Centre for Catalysis, KCK
Chalmers (22490-4), 2018-01-01 -- 2021-12-31.
Volvo Group (22490-4), 2018-01-01 -- 2021-12-31.
Swedish Energy Agency, 2018-01-01 -- 2021-12-31.
ECAPS AB, 2018-01-01 -- 2021-12-31.
Johnson Matthey AB (22490-4), 2018-01-01 -- 2021-12-31.
Umicore (22490-4), 2018-01-01 -- 2021-12-31.
Scania CV AB (22490-4), 2018-01-01 -- 2021-12-31.
Volvo Cars (22490-4), 2018-01-01 -- 2021-12-31.
Preem (22490-4), 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