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Time resolved X-ray Powder Diffraction on a THree Way Catalyst at the GILDA beamline (Articolo in rivista)

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Time resolved X-ray Powder Diffraction on a THree Way Catalyst at the GILDA beamline (Articolo in rivista) (literal)

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Martorana A., Deganello G., Longo A., Deganello F., Liotta L. F., Macaluso A., Pantaleo G.,Balerna A., Meneghini C., (2003)
Time resolved X-ray Powder Diffraction on a THree Way Catalyst at the GILDA beamline
in Journal of synchrotron radiation
(literal)

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Martorana A., Deganello G., Longo A., Deganello F., Liotta L. F., Macaluso A., Pantaleo G.,Balerna A., Meneghini C., (literal)

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Time resolved X-ray diffraction experiments carried out at the beamline BM08-GILDA of ESRF allowed to study the structural modifications taking place in a Pt/ceria-zirconia catalyst while the CO oxidation reaction was going on. (literal)

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Dipartimento di Chimica Inorganica, Università di Palermo, Viale delle Scienze, 90128 Palermo, Italy ISMN-CNR, Sezione di Palermo, Via Ugo La Malta 153, 90146 Palermo, Italy INFN-LNF, Via Enrico Fermi 44, 00044 Frascati, Italy Dipartimento di Fisica 'E. Amaldi', Università di Roma Tre, Via della Vasca Navale 84, 00146 Roma, Italy Ist. Naz. per la Fis. della Materia, GILDA, BP 220, 38043 Grenoble Cedex, France (literal)

Titolo

Time resolved X-ray Powder Diffraction on a THree Way Catalyst at the GILDA beamline (literal)

Abstract

Time resolved X-ray diffraction experiments carried out at the beamline BM08-GILDA of ESRF allowed to study the structural modifications taking place in a Pt/ceria-zirconia catalyst while the CO oxidation reaction was going on. The capillary tube in which the sample is stored acts effectively as a chemical microreactor that ensures homogeneity of the sample treatments and minimization of diffusion effects. During the flowing of the reactant CO/He mixture, the investigated catalyst undergoes a fast Ce(IV)-Ce(III) partial reduction, involving the release of one oxygen every two reduced Ce cations. Due to the larger ionic radius of Ce(III), the structural modification produces an increase of the lattice constant of the ceria-zirconia mixed oxide that is monitored by the translating imaging plate device implemented at GILDA. The CO2 resulting from the oxidation of the fluxed CO is monitored by a quadrupole mass spectrometer during the recording of the time resolved XRD pattern. The combined chemical and structural information allowed to show that the CO2 yield is nearly constant until the catalytic system can provide oxygen for the reaction, while the structural rearrangement of the catalyst is delayed with respect to the switching on of the CO/He flux. Only after this induction time, during which CO2 is produced with no structural modification of the catalyst, a fast increase of the lattice constant takes place. (literal)

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