Ru/ZrO{sub 2} catalysts. 2. N{sub 2}O adsorption and decomposition

Journal Article · Mon May 15 04:00:00 EDT 2000 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.2000.2836· OSTI ID:20076101

Pinna, F; Scarpa, M; Strukul, G; Guglielminotti, E; Boccuzzi, F; Manzoli, M

Nitrous oxide decomposition studies on an Ru/ZrO{sub 2} catalyst (activated by oxidation or reduction at 623 and 773 K) have been performed in a flow reactor at 1 atm total pressure. The reaction onset temperature is 573 K, while a complete conversion of reactant is achieved at 773 K. At a given temperature, the oxidized sample exhibits higher conversions with respect to the reduced one, while on the latter a significant induction period for a stable conversion with time on stream was observed. In situ FTIR experiments have indicated that RuO{sub 3} clusters can be found in a dynamic equilibrium with an RuO{sub 2} surface layer at the reaction conditions. Ru surface atoms with a valence state greater than 4 and tetrahedrically coordinated were found to be able to interact with N{sub 2}O at room temperature. At 773 K, upon introduction of N{sub 2}O a drastic decrease in the N{sub 2}O vibrational modes is observed with a simultaneous rapid decrease of N{sub 2}O and increase of O{sub 2} and N{sub 2} in the gas phase. It was concluded that during the reaction N{sub 2}O acts as a reductant of the oxidized ruthenium surface (Ru{sup 6+}) sites and as an oxidant of RuO{sub 2} (Ru{sup 4+}) sites.

• Research Organization: Univ. di Venezia (IT)
• OSTI ID: 20076101
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 192; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL INDUSTRY
CHEMISORPTION
DECOMPOSITION
NITROUS OXIDE
RUTHENIUM
ZIRCONIUM OXIDES