Studies to the functioning of automotive exhaust catalysts using in-situ positron emission tomography

K.A. Vonkeman, G. Jonkers, R.A. Santen, van

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

6 Citations (Scopus)
27 Downloads (Pure)

Abstract

To elucidate reaction kinetics in exhaust catalysis, the application of a technique stemming from nuclear medicine, i.e., Positron Emission Tomog., was developed. Short lived positron emitting nuclides 11C (t1/2 = 20 min), 13N (t1/2 = 10 min) and 15O (t1/2 = 2 min) were used to synthesize actual reactant mols. such as 11CO, 11CO2, 11CH4, 13N2, 15OO, C15O, and C15OO. The labeled reactants could be monitored in a catalyst bed right through the reactor wall using a Positron Emission Tomograph, with a resoln. of 1 cm in place of 1 s in time. Thus, a large amt. of information on the residence time of the reactants is obtained directly from the catalyst surface under actual reaction conditions. The mechanism and the rate limiting step in the CO oxidn. on Pt under cold start conditions of a car was studied. A strong interaction was found between gas phase CO2 and CeO2 at the catalyst surface, whereby the O atoms contained in lattice CeO2 exchange rapidly with the O atoms of the adsorbed CO2
Original languageEnglish
Title of host publicationCAPoC : international symposium on catalysis and automotive pollution control : proceedings, 2nd, Brussels, Belgium, September 10-13, 1990
EditorsA. Crucq
Place of PublicationAmsterdam
PublisherElsevier
Pages239-252
ISBN (Print)0-444-88787-3
DOIs
Publication statusPublished - 1991
Eventconference; CAPOC ; 2 (Brüssel/Belgien) : 1990.09.10-13; 1990-09-10; 1990-09-13 -
Duration: 10 Sep 199013 Sep 1990

Publication series

NameStudies in Surface Science and Catalysis
Volume71
ISSN (Print)0167-2991

Conference

Conferenceconference; CAPOC ; 2 (Brüssel/Belgien) : 1990.09.10-13; 1990-09-10; 1990-09-13
Period10/09/9013/09/90
OtherCAPOC ; 2 (Brüssel/Belgien) : 1990.09.10-13

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