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Highly Dispersed Partially Stabilized Zirconias: Synthesis, Bulk and Surface Properties, Performance in the Selective Reduction of Nitrogen Oxides by Propane in the Excess of Oxygen

Published online by Cambridge University Press:  10 February 2011

Vladislav A. Sadykov ,
A. S. Ivanova ,
G. M. Alikina ,
V. P. Ivanov ,
N. N. Bulgakov ,
A. N. Kharlanov ,
E. V. Lunina ,
V. V. Lunin ,
N. A. Zubareva  and
V. A. Matyshak
...Show all authors
Vladislav A. Sadykov
Affiliation:
Boreskov Institute of Catalysis SD RAS, 5 Lavrentieva Av., Novosibirsk, Russia, 630090.
A. S. Ivanova
Affiliation:
Boreskov Institute of Catalysis SD RAS, 5 Lavrentieva Av., Novosibirsk, Russia, 630090.
G. M. Alikina
Affiliation:
Boreskov Institute of Catalysis SD RAS, 5 Lavrentieva Av., Novosibirsk, Russia, 630090.
V. P. Ivanov
Affiliation:
Boreskov Institute of Catalysis SD RAS, 5 Lavrentieva Av., Novosibirsk, Russia, 630090.
N. N. Bulgakov
Affiliation:
Boreskov Institute of Catalysis SD RAS, 5 Lavrentieva Av., Novosibirsk, Russia, 630090.
A. N. Kharlanov
Affiliation:
Chemical Department, Lomonosov State University, Vorobyevy Gory, Moscow, Russia, 119899.
E. V. Lunina
Affiliation:
Chemical Department, Lomonosov State University, Vorobyevy Gory, Moscow, Russia, 119899.
V. V. Lunin
Affiliation:
Chemical Department, Lomonosov State University, Vorobyevy Gory, Moscow, Russia, 119899.
N. A. Zubareva
Affiliation:
Chemical Department, Lomonosov State University, Vorobyevy Gory, Moscow, Russia, 119899.
V. A. Matyshak
Affiliation:
Semenov Institute of Chemical Physics, 4 Kosygina St., Moscow, Russia, 117977.
A. Ya. Rozovskii
Affiliation:
Topchiev Institute of Petrochemical Synthesis, 29 Leninskii Av., Moscow, Russia, 117912
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Abstract

Bulk and surface properties of dispersed partially stabilized zirconias (PSZ) prepared via coprecipitation of zirconium and alkaline-earth metal hydroxides have been studied by XPD, SIMS, IR spectroscopy of surface hydroxyls and adsorbed C.O. For Sr- and Ca-PSZ, the number of the Lewis acid centers, surface concentration of the guest cation and Zr-O bonding strength at the surface have been found to deviate substantially from the values predicted by a bulk truncation model, while for Ba-PSZ it seems to be valid. A local reconstruction of the near-surface layer into the perovskite-like structure was proposed for the first two systems, which explained satisfactorily their surface properties including catalytic performance in the selective reduction of nitrogen oxides by propane in the excess of oxygen. Such reconstruction is probably facilitated by segregation of the guest cations in the subsurface layer. The driving force for this process depends upon site preference of the alkaline-earth cations to cubooctahedrons and steric factors.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 454: Symposium S – Advanced Catalytic Materials–1996 , 1996 , 199
Copyright
Copyright © Materials Research Society 1997

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References

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