Study of the sorption of carbon monoxide, oxygen and carbon dioxide on platinum-rhodium alloy catalysts by a new gas chromatographic methodology

Citation
D. Gavril et G. Karaiskakis, Study of the sorption of carbon monoxide, oxygen and carbon dioxide on platinum-rhodium alloy catalysts by a new gas chromatographic methodology, J CHROMAT A, 845(1-2), 1999, pp. 67-83
Citations number
37
Categorie Soggetti
Chemistry & Analysis","Spectroscopy /Instrumentation/Analytical Sciences
Journal title
Volume
845
Issue
1-2
Year of publication
1999
Pages
67 - 83
Database
ISI
SICI code
Abstract
The mechanism of the CO oxidation reaction over Pt-Rh alloy catalysts was e xtracted from the adsorption of CO, O-2 and CO, on these catalysts. Reverse d-flow gas chromatography was applied to the study of these important sorpt ion processes. Using suitable mathematical analysis, equations were derived by means of which rate constants for the adsorption and desorption of CO, O-2 and CO2 on and from the Pt-Rh bimetallic catalysts were determined. Tem perature dependence of the rate constants for the sorption processes were a lso determined and the Arrhenius parameters for the adsorption and desorpti on were calculated. The dependence of activation energies for adsorption, d esorption and disproportionation reaction on the catalyst Pt content indica tes that for the CO oxidation reaction the most active is the Pt-rich catal yst, while for the CO disproportionation reaction the most active is the Rh -rich catalyst. (C) 1999 Elsevier Science B.V. All rights reserved.