Synergy between hydrogen and ceria in Pt-catalyzed CO oxidation: An investigation on Pt-CeO2 catalysts synthesized by solution combustion

F. Morfin 1 T. S. Nguyen J. L. Rousset 1 L. Piccolo 2
1 ING - IRCELYON-Ingéniérie, du matériau au réacteur
IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon
2 ECI2D - IRCELYON-Energies, carburants, intermédiaires pour le développement durable
IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon
Abstract : Pt-CeO2 catalysts were prepared by solution combustion synthesis (SCS), a simple and fast one-pot method, using glycine or oxalyl dihydrazide (ODH) as the fuel and Pt chloride,or nitrate as the metal precursor. The samples were characterized by ICP-OES, N-2 volumetry, XRD, XPS, aberration-corrected (S)TEM, CO-DRIFTS and microRaman spectroscopy. The SCS catalysts were evaluated in CO oxidation and preferential oxidation (PROX) of CO in H-2 excess, and compared to PtiCeO(2) and Pt/Al2O3 catalysts prepared by incipient wetness impregnation. The glycine fuel yields better results than ODH in terms of Pt dispersion and catalytic performance. The fresh Cl-containing catalysts consist of PtO nanopartides poorly active in CO oxidation, while the catalysts synthesized from Pt nitrate contain highly active Pt delta+ (0 < delta < 2) species in interaction with ceria. Consistently, the most efficient catalyst for H-2-free CO oxidation is the one synthesized from glycine and Pt nitrate. For PROX, the selectivity to CO2 is 100% at low temperature and decreases in a similar way for all the Pt-CeO2 catalysts above ca. 100 degrees C. With respect to H-2-free conditions, the CO PROX activity of the Pt-CeO2 catalysts is considerably enhanced (activity multiplied by up to 60 at 110 degrees C), while the activity gairvis comparatively minor for Pt/Al2O3. We conclude that hydrogen, by increasing the mobility of oxygen species at the surface of ceria, promotes the support-assisted pathway of CO oxidation. (C) 2016 Elsevier B.V. All rights reserved.
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Submitted on : Monday, October 17, 2016 - 2:18:34 PM
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F. Morfin, T. S. Nguyen, J. L. Rousset, L. Piccolo. Synergy between hydrogen and ceria in Pt-catalyzed CO oxidation: An investigation on Pt-CeO2 catalysts synthesized by solution combustion. Applied Catalysis B: Environmental, Elsevier, 2016, 197, pp.2-13. ⟨10.1016/j.apcatb.2016.01.056⟩. ⟨hal-01382687⟩

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