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
Peter Thormählen
Institutionen för kemisk reaktionsteknik
Kompetenscentrum katalys
Erik Fridell
Chalmers, Teknisk fysik, Kemisk fysik
Kompetenscentrum katalys
Fageh Hajbolouri
Edward Jobson
Kompetenscentrum katalys
Institutionen för kemisk reaktionsteknik
Chemical Engineering Science
0009-2509 (ISSN)
Vol. 54 20 4559-4566Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
Ämneskategorier
Kemiteknik
DOI
10.1016/S0009-2509(99)00139-6