Nanocrystalline Catalysts Based on CeO2-ZrO2 Doped by Praseodymium or Gadolinium: Synthesis and Properties Full article
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2005 MRS Fall Meeting 28 Nov - 2 Dec 2005 , Boston |
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| Source | Nanoparticles and Nanostructures in Sensors and Catalysis : proceedings of a meeting held 28 November - 2 December 2005, Boston, Massachusetts, USA. Symposium O at the 2005 MRS Fall Meeting (Materials Research Society symposium proceedings, Vol.900) Compilation, Cambridge University Press ( CUP ) / Materials Research Society ( MRS ). 2006. 500 c. ISBN 9781558998551. |
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Materials Research Society Symposium Proceedings
ISSN: 0272-9172 |
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| Output data | Year: 2006, Volume: 900, Article number : 0900-O10-04, Pages count : 1 | ||||||
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Abstract:
The structural features of nanocryst. samples of Pr- or Gd-doped (5-30 at.%) ceria-zirconia (1:1)-based solid solns. prepd. by polymd. precursor (Pechini) route and calcined at 500° were studied by using XRD, EXAFS, and Raman spectrometry, while their surface features before and after Pt supporting were characterized by IR spectroscopy of adsorbed CO test mols. The effects of the nature and content of a dopant on the structural and surface features of studied systems as related to the oxygen mobility and catalytic activity in the reaction of methane selective oxidn. into syngas at short contact times were considered. Nanocryst. Pr- of Gd-doped ceria-zirconia fluorite-like solid solns. prepd. via the Pechini route can be described by a model of the cubic Fm3m structure with dopants occupying regular positions of Ce or Zr cations. Pr is present in both 3+ and 4+ states, so its doping effect was rather similar to that of Gd. Rearrangement of the local environment around doping cations at their high content decreases the lattice oxygen mobility, while disordering the surface layer and increasing the d. of domain boundaries. This helps to fix Pt2+ cations in the vicinity of some surface defects, and thus, to stabilize small Pt0 clusters in reaction media, while avoiding undesirable combustion of methane or syngas.
Cite:
Sadykov V.A.
, Frolova-Borchert Y.V.
, Mezentseva N.V.
, Alikina G.M.
, Lukashevich A.I.
, Paukshtis E.A.
, Muzykantov V.S.
, Batuev L.C.
, Kuznetsova T.G.
, Moroz E.M.
, Zyuzin D.A.
, Kol'ko V.P.
, Burgina E.B.
, Kriventsov V.V.
, Kochubei D.I.
, Kemnitz E.
, Schcurell K.
Nanocrystalline Catalysts Based on CeO2-ZrO2 Doped by Praseodymium or Gadolinium: Synthesis and Properties
In compilation Nanoparticles and Nanostructures in Sensors and Catalysis : proceedings of a meeting held 28 November - 2 December 2005, Boston, Massachusetts, USA. Symposium O at the 2005 MRS Fall Meeting (Materials Research Society symposium proceedings, Vol.900). – Cambridge University Press ( CUP ) / Materials Research Society ( MRS )., 2006. – ISBN 9781558998551. Scopus РИНЦ ANCAN
Nanocrystalline Catalysts Based on CeO2-ZrO2 Doped by Praseodymium or Gadolinium: Synthesis and Properties
In compilation Nanoparticles and Nanostructures in Sensors and Catalysis : proceedings of a meeting held 28 November - 2 December 2005, Boston, Massachusetts, USA. Symposium O at the 2005 MRS Fall Meeting (Materials Research Society symposium proceedings, Vol.900). – Cambridge University Press ( CUP ) / Materials Research Society ( MRS )., 2006. – ISBN 9781558998551. Scopus РИНЦ ANCAN
Identifiers:
| Scopus: | 2-s2.0-34249939835 |
| Elibrary: | 15041812 |
| Chemical Abstracts: | 2008:742099 |
| Chemical Abstracts (print): | 149:358903 |