NO reduction by CO over Pt/Al{sub 2}O{sub 3} and Pt/CeO{sub x}/Al{sub 2}O{sub 3}: Oscillations and deactivation

Journal Article · Sat Jun 01 04:00:00 EDT 1996 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1996.0187· OSTI ID:471626

Mergler, Y J; Nieuwenhuys, B E ^[1]

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1. Leiden Univ. (Netherlands)

CO/NO reactions have been studied over two catalysts, Pt/CeO{sub x}/Al{sub 2}O{sub 3} and Pt/Al{sub 2}O{sub 3}, under net reducing conditions. The Pt/Al{sub 2}O{sub 3} catalyst deactivated with time at 400{degrees}C whereas the Pt/CeO{sub x}/Al{sub 2}O{sub 3} catalyst showed oscillations in the reaction rate at this temperature. The oscillations had periods of 18 min. By using Fourier transform infrared spectroscopy, an attempt was made to reveal the species that inhibits the reaction over Pt. It is suggested that Ce{sub x} provides dissociation centers for NO under conditions where NO dissociation is hindered by the inhibiting species on the Pt sites. 47 refs., 9 figs., 1 tab.

• OSTI ID: 471626
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 161; ISSN JCTLA5; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
33 ADVANCED PROPULSION SYSTEMS
40 CHEMISTRY
ABSORPTION SPECTROSCOPY
ALUMINIUM OXIDES
CARBON MONOXIDE
CATALYTIC EFFECTS
CERIUM OXIDES
NITRIC OXIDE
OXIDATION
PLATINUM
REDUCTION