TY - JOUR
T1 - Influence of SMSI effect on the catalytic activity of a Pt(1%)/ Ce0.6Zr0.4O2 catalyst: SAXS, XRD, XPS and TPR investigations
AU - Martorana, Antonino
AU - Deganello, Giulio
AU - Deganello, null
AU - Venezia, Anna Maria
AU - Martorana, Antonino
AU - Longo, Alessandro
AU - Liotta, Leonarda F.
AU - Macaluso, Angelo
AU - Pantaleo, Giuseppe
PY - 2004
Y1 - 2004
N2 - 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-flowreactor, 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 thesample pre-treated in H2 at 800 and 1050 ◦C. Moreover, transient reactivity tests of NO reduction by hydrogen were also carried out. Aspreviously observed, the sample reduced at 350 ◦C was the most active catalyst. In both types of reactions the temperature and the nature ofpre-treatments had no effect on the selectivity to N2 at the temperature of maximum NO conversion. Analyses by temperature programmedreduction (TPR), small-angle X-ray scattering (SAXS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) supported theoccurrence of a strong metal–support interaction (SMSI) effect between platinum and ceria and the important role of the platinum in promotingthe ceria-zirconia structural reorganization. Such type of interaction determined a decrease of the platinum and ceria reduction temperatureand a stabilization of the platinum oxide even in reducing atmosphere at high temperature. The catalytic behavior of the Pt/ceria-zirconiacatalyst was discussed in terms of the structural and electronic modifications induced by the SMSI effect.
AB - 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-flowreactor, 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 thesample pre-treated in H2 at 800 and 1050 ◦C. Moreover, transient reactivity tests of NO reduction by hydrogen were also carried out. Aspreviously observed, the sample reduced at 350 ◦C was the most active catalyst. In both types of reactions the temperature and the nature ofpre-treatments had no effect on the selectivity to N2 at the temperature of maximum NO conversion. Analyses by temperature programmedreduction (TPR), small-angle X-ray scattering (SAXS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) supported theoccurrence of a strong metal–support interaction (SMSI) effect between platinum and ceria and the important role of the platinum in promotingthe ceria-zirconia structural reorganization. Such type of interaction determined a decrease of the platinum and ceria reduction temperatureand a stabilization of the platinum oxide even in reducing atmosphere at high temperature. The catalytic behavior of the Pt/ceria-zirconiacatalyst was discussed in terms of the structural and electronic modifications induced by the SMSI effect.
UR - http://hdl.handle.net/10447/23980
UR - https://www.sciencedirect.com/science/article/pii/S0926337303004831
M3 - Article
VL - 48
SP - 133
EP - 149
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
SN - 0926-3373
ER -