Induced low temperature catalytic ignition by transient changes in the gas composition
Artikel i vetenskaplig tidskrift, 2002

The effect of gas composition changes on the low temperature activity for supported platinum model catalysts has been studied. By introducing well-controlled periodic O2 pulses to a simple diluted gas mixture of CO and O2, a substantial improvement of the low temperature oxidation activity was observed. The reason for low activity on noble metals at low temperatures is often attributed to self-poisoning by CO. The improved catalytic performance observed is proposed to origin from the transients causing a surface reactant composition that is favourable for the reaction rate, i.e. lower degree of self-poisoning. This was also confirmed by in situ Fourier transform infrared spectroscopy in combination with mass spectrometry measurements, which gave evidence for the existence of a strong interplay between the gas phase concentration and the adsorbate composition for these catalysts.

cold start emissions

catalytic oxidation

platinum

DRIFT

carbon monoxide

self-poisoning

in situ FT-IR

low temperature activity

transient changes

periodic pulsing

Författare

Per-Anders Carlsson

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för kemiteknik och miljövetenskap

Magnus Skoglundh

Institutionen för teknisk ytkemi

Kompetenscentrum katalys (KCK)

Erik Fridell

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Edward Jobson

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för kemiteknik och miljövetenskap, Kemisk reaktionsteknik

Bengt Andersson

Kompetenscentrum katalys (KCK)

Chalmers, Institutionen för kemiteknik och miljövetenskap, Kemisk reaktionsteknik

Catalysis Today

0920-5861 (ISSN)

Vol. 73 3-4 307-313

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiteknik

Miljövetenskap

DOI

10.1016/S0920-5861(02)00014-7

Mer information

Skapat

2017-10-07