Periodic control for improved low-temperature catalytic activity
Artikel i vetenskaplig tidskrift, 2001

The influence of transient changes in the gas composition on the low-temperature activity of a commercial three-way catalyst and a Pt/Al2O3 model catalyst has been studied. By introducing well-controlled periodic O2 pulses to simple gas mixtures of CO or C3H6 (in N2), a substantial improvement of the low temperature oxidation activity was observed for both catalysts. The reason for low activity at low temperatures is normally attributed to self-poisoning by CO or hydrocarbons. The improved catalytic performance observed here is suggested to origin from the transients causing a surface reactant composition that is favourable for the reaction rate.

self-poisoning

cold start emissions

low temperature activity

periodic pulsing

catalytic oxidation

platinum

carbon monoxide

transient changes

Författare

Per-Anders Carlsson

Kompetenscentrum katalys (KCK)

Institutionen för kemisk reaktionsteknik

Peter Thormählen

Kompetenscentrum katalys (KCK)

Institutionen för kemisk reaktionsteknik

Magnus Skoglundh

Institutionen för teknisk ytkemi

Kompetenscentrum katalys (KCK)

Hans Persson

Kompetenscentrum katalys (KCK)

Institutionen för fysik

Erik Fridell

Kompetenscentrum katalys (KCK)

Chalmers, Teknisk fysik

Edward Jobson

Institutionen för kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Bengt Andersson

Institutionen för kemisk reaktionsteknik

Kompetenscentrum katalys (KCK)

Topics in Catalysis

1022-5528 (ISSN) 1572-9028 (eISSN)

Vol. 16-17 343-347

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