In-situ positron emission of CO oxidation

K.A. Vonkeman, G. Jonkers, S.W.A. Wal, van der, R.A. Santen, van

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Using a Neuro ECAT positron tomog., the Positron Emission computed Tomog. (PET) was utilized to image the catalytic oxidn. of CO by using CO and CO2, labeled with short lived positron emitting nuclides. Studies were performed over highly dispersed CeO2/g-Al2O3 supported Pt and Rh catalysts. With a math. model of the reaction kinetics, based on the elementary steps of the catalytic reaction and partially on literature surface science data, the effect of CeO2 promotion and the presence of NO were quantified in terms of the no. of adsorption sites and adsorption equil. consts. O atoms of CO2 remain much longer in the catalyst bed than the C atoms, which is due to carbonate formation at the CeO2 surface and exchange of the oxygen atoms of these carbonate groups with the CeO2 lattice O atoms. The heat of desorption of CO from the noble metal surface at low temps. increased due to the presence of NO mols. at the surface. At higher temps. NO dissocs., the adsorbed N and O atoms have a repulsive interaction with adsorbed CO mols
Originele taal-2Engels
Pagina's (van-tot)333-339
TijdschriftBerichte der Bunsen-Gesellschaft : Physical Chemistry, Chemical Physics
Nummer van het tijdschrift3
StatusGepubliceerd - 1993

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