The steady-state activity of NO reduction by C3H6, in lean conditions, was studied on a Pt(1%)/Ce0.6Zr0.4O2 catalyst, in a plug-flow reactor, in the temperature range 100–500 ◦C. The influence of reductive pre-treatments on the catalytic performance at low temperature (250 ◦C) was investigated. Enhancement of the activity was found for the catalyst pre-treated in hydrogen at 350 ◦C as compared to the sample pre-treated in H2 at 800 and 1050 ◦C. Moreover, transient reactivity tests of NO reduction by hydrogen were also carried out. As previously observed, the sample reduced at 350 ◦C was the most active catalyst. In both types of reactions the temperature and the nature of pre-treatments had no effect on the selectivity to N2 at the temperature of maximum NO conversion. Analyses by temperature programmed reduction (TPR), small-angle X-ray scattering (SAXS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) supported the occurrence of a strong metal–support interaction (SMSI) effect between platinum and ceria and the important role of the platinum in promoting the ceria-zirconia structural reorganization. Such type of interaction determined a decrease of the platinum and ceria reduction temperature and a stabilization of the platinum oxide even in reducing atmosphere at high temperature. The catalytic behavior of the Pt/ceria-zirconia catalyst was discussed in terms of the structural and electronic modifications induced by the SMSI effect.

LIOTTA, L.F., LONGO, A., MACALUSO, A., MARTORANA, A., PANTALEO, G., VENEZIA, A.M., et al. (2004). Influence of SMSI effect on the catalytic activity of a Pt(1%)/ Ce0.6Zr0.4O2 catalyst: SAXS, XRD, XPS and TPR investigations. APPLIED CATALYSIS. B, ENVIRONMENTAL, 48(2), 133-149 [10.1016/j.apcatb.2003.10.001].

Influence of SMSI effect on the catalytic activity of a Pt(1%)/ Ce0.6Zr0.4O2 catalyst: SAXS, XRD, XPS and TPR investigations

MACALUSO, Angelo;MARTORANA, Antonino;PANTALEO, Giuseppe;DEGANELLO, Giulio
2004-01-01

Abstract

The steady-state activity of NO reduction by C3H6, in lean conditions, was studied on a Pt(1%)/Ce0.6Zr0.4O2 catalyst, in a plug-flow reactor, in the temperature range 100–500 ◦C. The influence of reductive pre-treatments on the catalytic performance at low temperature (250 ◦C) was investigated. Enhancement of the activity was found for the catalyst pre-treated in hydrogen at 350 ◦C as compared to the sample pre-treated in H2 at 800 and 1050 ◦C. Moreover, transient reactivity tests of NO reduction by hydrogen were also carried out. As previously observed, the sample reduced at 350 ◦C was the most active catalyst. In both types of reactions the temperature and the nature of pre-treatments had no effect on the selectivity to N2 at the temperature of maximum NO conversion. Analyses by temperature programmed reduction (TPR), small-angle X-ray scattering (SAXS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) supported the occurrence of a strong metal–support interaction (SMSI) effect between platinum and ceria and the important role of the platinum in promoting the ceria-zirconia structural reorganization. Such type of interaction determined a decrease of the platinum and ceria reduction temperature and a stabilization of the platinum oxide even in reducing atmosphere at high temperature. The catalytic behavior of the Pt/ceria-zirconia catalyst was discussed in terms of the structural and electronic modifications induced by the SMSI effect.
2004
LIOTTA, L.F., LONGO, A., MACALUSO, A., MARTORANA, A., PANTALEO, G., VENEZIA, A.M., et al. (2004). Influence of SMSI effect on the catalytic activity of a Pt(1%)/ Ce0.6Zr0.4O2 catalyst: SAXS, XRD, XPS and TPR investigations. APPLIED CATALYSIS. B, ENVIRONMENTAL, 48(2), 133-149 [10.1016/j.apcatb.2003.10.001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/23980
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