Positron Emission Imaging in catalysis

B.G. Anderson, R.A. Santen, van, L.J. IJzendoorn, van

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A review with 52 refs.; in situ imaging technol. developed for nuclear medicine is now being applied to study the kinetics of heterogeneous catalytic reactions under actual process conditions. Minute quantities of mols. (ca. 10-15 mol), radio-labeled with positron-emitting isotopes such as 11C;13N; or 15O, are injected as pulses into the feed streams of chem. reactors. Subsequent coincident detection of pairs of gamma photons produced via positron-electron annihilation allows the concn. of reactants, intermediates and products to be mapped as a function of both time and position within the reactor bed. As well as providing qual. information regarding the mechanism of the reaction under investigation the data obtained can be compared with math. models based on the reaction kinetics in order to refine parameters such as activation energies and pre-exponential factors for elementary reaction steps. Since the technique is capable of imaging transient phenomena, information is provided that is not accessible to steady-state techniques
Original languageEnglish
Pages (from-to)125-138
JournalApplied Catalysis. A, General
Issue number1
Publication statusPublished - 1997


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