Journal
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
Volume 74, Issue 2, Pages 255-265Publisher
CHEMICAL SOC JAPAN
DOI: 10.1246/bcsj.74.255
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The adsorption kinetics on Au/Ti(OH)(4)* (a newly developed Au catalyst, active for low-temperature CO oxidation) for CO, O-2, and CO2 in the temperature range 298-473 K was determined by temporal analysis of products (TAP) technique. The response signals from the single-pulse TAP experiments were analyzed using a statistical approach, and they were fitted to analytical models in order to establish the adsorption/desorption parameters. The pulse response of a non-adsorbing gas (argon) was used as a reference. The experiments revealed that: CO molecules reversibly adsorbed on the catalyst surface; O-2 molecularly adsorbed, irreversibly for high pulse intensities and reversibly for low pulse ones; CO2 molecules irreversibly adsorbed on the surface, probably as carbonates. This catalyst exhibited an apparent negative activation energy for irreversible adsorption of O-2.
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