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

Abstract

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 oxidantmore » of RuO{sub 2} (Ru{sup 4+}) sites.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Univ. di Venezia (IT)
OSTI Identifier:
20076101
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 192; Journal Issue: 1; Other Information: PBD: 15 May 2000; Journal ID: ISSN 0021-9517
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; RUTHENIUM; ZIRCONIUM OXIDES; CATALYTIC EFFECTS; NITROUS OXIDE; CHEMISORPTION; DECOMPOSITION; CHEMICAL INDUSTRY; CATALYSTS

Citation Formats

Pinna, F., Scarpa, M., Strukul, G., Guglielminotti, E., Boccuzzi, F., and Manzoli, M. Ru/ZrO{sub 2} catalysts. 2. N{sub 2}O adsorption and decomposition. United States: N. p., 2000. Web. doi:10.1006/jcat.2000.2836.
Pinna, F., Scarpa, M., Strukul, G., Guglielminotti, E., Boccuzzi, F., & Manzoli, M. Ru/ZrO{sub 2} catalysts. 2. N{sub 2}O adsorption and decomposition. United States. doi:10.1006/jcat.2000.2836.
Pinna, F., Scarpa, M., Strukul, G., Guglielminotti, E., Boccuzzi, F., and Manzoli, M. Mon . "Ru/ZrO{sub 2} catalysts. 2. N{sub 2}O adsorption and decomposition". United States. doi:10.1006/jcat.2000.2836.
@article{osti_20076101,
title = {Ru/ZrO{sub 2} catalysts. 2. N{sub 2}O adsorption and decomposition},
author = {Pinna, F. and Scarpa, M. and Strukul, G. and Guglielminotti, E. and Boccuzzi, F. and Manzoli, M.},
abstractNote = {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.},
doi = {10.1006/jcat.2000.2836},
journal = {Journal of Catalysis},
issn = {0021-9517},
number = 1,
volume = 192,
place = {United States},
year = {2000},
month = {5}
}