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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Uittreksel

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
Volume97
Nummer van het tijdschrift3
DOI's
StatusGepubliceerd - 1993

Vingerafdruk

Positrons
Carbon Monoxide
Atoms
Oxidation
Carbonates
Adsorption
Catalysts
Precious metals
Reaction kinetics
Isotopes
Desorption
Ion exchange
Oxygen

Citeer dit

Vonkeman, K.A. ; Jonkers, G. ; Wal, van der, S.W.A. ; Santen, van, R.A. / In-situ positron emission of CO oxidation. In: Berichte der Bunsen-Gesellschaft : Physical Chemistry, Chemical Physics. 1993 ; Vol. 97, Nr. 3. blz. 333-339.
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title = "In-situ positron emission of CO oxidation",
abstract = "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",
author = "K.A. Vonkeman and G. Jonkers and {Wal, van der}, S.W.A. and {Santen, van}, R.A.",
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In-situ positron emission of CO oxidation. / Vonkeman, K.A.; Jonkers, G.; Wal, van der, S.W.A.; Santen, van, R.A.

In: Berichte der Bunsen-Gesellschaft : Physical Chemistry, Chemical Physics, Vol. 97, Nr. 3, 1993, blz. 333-339.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - In-situ positron emission of CO oxidation

AU - Vonkeman, K.A.

AU - Jonkers, G.

AU - Wal, van der, S.W.A.

AU - Santen, van, R.A.

PY - 1993

Y1 - 1993

N2 - 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

AB - 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

U2 - 10.1002/bbpc.19930970315

DO - 10.1002/bbpc.19930970315

M3 - Article

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EP - 339

JO - Berichte der Bunsen-Gesellschaft : Physical Chemistry, Chemical Physics

JF - Berichte der Bunsen-Gesellschaft : Physical Chemistry, Chemical Physics

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