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Τίτλος: Mechanistic aspects of the H2-SCR of NO on a novel Pt/MgO−CeO2 catalyst
Συγγραφείς: Efstathiou, Angelos M. 
Costa, Costas 
Major Field of Science: Engineering and Technology
Λέξεις-κλειδιά: Metals;Nitrogen oxides
Ημερομηνία Έκδοσης: 26-Ιαν-2007
Πηγή: The Journal of Physical Chemistry C, 2007, vol. 111, no. 7, pp 3010-3020.
Volume: 111
Issue: 7
Start page: 3010
End page: 3020
Περιοδικό: The Journal of Physical Chemistry C 
Περίληψη: Steady State Isotopic Transient Kinetic Analysis (SSITKA) coupled with Temperature-Programmed Surface Reaction (TPSR) experiments, using on line Mass Spectroscopy (MS) and in situ DRIFTS have been performed to study essential mechanistic aspects of the selective catalytic reduction of NO by H2 under strongly oxidizing conditions (H2-SCR) at 140 Β°C over a novel 0.1 wt % Pt/MgOβ ’CeO2 catalyst for which patents have been recently obtained. The nitrogen paths of reaction from NO to N2 and N2O gas products were probed by following the 14NO/H2/O2 β†’ 15NO/H2/O2 switch (SSITKA-MS and SSITKA-DRIFTS) at 1 bar total pressure. It was found that the N-pathways of reaction involve two different in structure active chemisorbed NOx species, one present on the MgO and the other one on the CeO2 support surface. The amount of these active NOx intermediate species formed was found to be 14.4 ΞΌmol/g, corresponding to a surface coverage of ΞΈ = 3.1 (based on Pt metal surface) in agreement with the SSITKA-DRIFTS results. A large fraction of it (87.5%) was found to participate in the reaction path for N2 formation, in harmony with the high N2 selectivity (82%) exhibited by this catalyst. Inactive adsorbed NOx species were also found to accumulate on both Pt and support (MgO and CeO2). The mechanism of reaction must involve a H-spillover from the Pt metal to the support surface (location of active NOx species). It was proven via the NO/H2/16O2 β†’ NO/H2/18O2 (SSITKA-MS) experiment that gaseous O2 does not participate in the reaction path of N2O formation.
URI: https://hdl.handle.net/20.500.14279/1729
ISSN: 19327455
DOI: 10.1021/jp064952o
Rights: © American Chemical Society
Type: Article
Affiliation: University of Cyprus 
Affiliation: University of Cyprus 
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