Improved light-off performance by using transient gas compositions in the catalytic treatment of car exhausts
Artikel i vetenskaplig tidskrift, 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

Författare

Magnus Skoglundh

Institutionen för teknisk ytkemi

Kompetenscentrum katalys (KCK)

Peter Thormählen

Institutionen för kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Erik Fridell

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Fageh Hajbolouri

Edward Jobson

Kompetenscentrum katalys (KCK)

Institutionen för kemisk reaktionsteknik

Chemical Engineering Sciences

0009-2509 (ISSN)

Vol. 54 20 4559-4566

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiteknik

DOI

10.1016/S0009-2509(99)00139-6