Induced low temperature catalytic ignition by transient changes in the gas composition
Journal article, 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

Author

Per-Anders Carlsson

Competence Centre for Catalysis (KCK)

Chalmers, Department of Chemical Engineering and Environmental Sciences

Magnus Skoglundh

Department of Applied Surface Chemistry

Competence Centre for Catalysis (KCK)

Erik Fridell

Chalmers, Applied Physics, Chemical Physics

Competence Centre for Catalysis (KCK)

Edward Jobson

Competence Centre for Catalysis (KCK)

Chalmers, Department of Chemical Engineering and Environmental Sciences, Chemical Reaction Engineering

Bengt Andersson

Competence Centre for Catalysis (KCK)

Chalmers, Department of Chemical Engineering and Environmental Sciences, Chemical Reaction Engineering

Catalysis Today

0920-5861 (ISSN)

Vol. 73 3-4 307-313

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Materials Science

Subject Categories

Chemical Engineering

Environmental Sciences

DOI

10.1016/S0920-5861(02)00014-7

More information

Created

10/7/2017