Improved light-off performance by using transient gas compositions in the catalytic treatment of car exhausts
Journal article, 1999
The influence of transient changes in the exhaust gas composition on the low-temperature activity of a Pt/CoOx/Al2O3, catalyst and a commercial three-way catalyst has been studied. Periodic O2 and CO pulses caused well-controlled perturbations in the composition of a synthetic car exhaust which was found to affect the overall performance of both catalysts. The presence of transients shifted the conversion starts of CO and propene as well as their light-off temperatures towards lower temperatures. The improved performance is suggested to origin from the combined effect of rich (CO) and lean (O2) pulses that cause perturbations in the adsorbate composition on the active sites at temperatures below light-off.
catalytic oxidation
exhaust gas catalysis
platinum
periodic pulsing
transient conditions
cobalt oxide
low-temperature activity
Author
Magnus Skoglundh
Department of Applied Surface Chemistry
Competence Centre for Catalysis (KCK)
Peter Thormählen
Department of Chemical Reaction Engineering
Competence Centre for Catalysis (KCK)
Erik Fridell
Chalmers, Applied Physics, Chemical Physics
Competence Centre for Catalysis (KCK)
Fageh Hajbolouri
Edward Jobson
Competence Centre for Catalysis (KCK)
Department of Chemical Reaction Engineering
Chemical Engineering Science
0009-2509 (ISSN)
Vol. 54 20 4559-4566Driving Forces
Sustainable development
Areas of Advance
Nanoscience and Nanotechnology
Transport
Energy
Materials Science
Subject Categories
Chemical Engineering
DOI
10.1016/S0009-2509(99)00139-6