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


periodic pulsing

transient conditions

cobalt oxide

low-temperature activity


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 Sciences

0009-2509 (ISSN)

Vol. 54 20 4559-4566

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)



Materials Science

Subject Categories

Chemical Engineering



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