Pt-Supported Nanocrystalline Ceria-Zirconia Doped with La, Pr or Gd: Factors Controlling Syngas Generation in Partial Oxidation/Autothermal Reforming of Methane or Oxygenates
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Conference |
E-MRS 2006 Fall Meeting, Symposium C - Doped Nanopowders: Synthesis, Characterisation, Applications
04-08 Sep 2006
,
Warsaw
|
| Source |
Doped Nanopowders
Compilation,
2007.
292 c. ISBN 9783908451389.
|
| Journal |
Solid State Phenomena (Предыдущее наименование: Diffusion and Defect Data Pt.B: Solid State Phenomena)
ISSN: 1662-9779
|
| Output data |
Year: 2007,
Volume: 128,
Pages: 239-248
Pages count
: 10
DOI:
10.4028/www.scientific.net/SSP.128.239
|
| Authors |
Sadykov V.A.
1
,
Mezentseva N.V.
1
,
Alikina G.M.
1
,
Lukashevich A.I.
1
,
Borchert Y.
2
,
Kuznetsova T.G.
1
,
Ivanov V.P.
1
,
Trukhan S.N.
1
,
Paukshtis E.A.
1
,
Muzykantov V.S.
1
,
Kuznetsov V.L.
1
,
Rogov V.A.
1
,
Ross J.R.H.
3
,
Kemnitz E.
4
,
Mirodatos C.
5
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis SB RAS
|
| 2 |
University of Bremen
|
| 3 |
University of Limerick
|
| 4 |
Humboldt University of Berlin
|
| 5 |
Institute of Researches on Catalysis and Environment in Lyon
|
|
Funding (4)
|
1
|
International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union
|
05-1000005-7663
|
|
2
|
Russian Foundation for Basic Research
|
05-03-34761
|
|
3
|
International Science and Technology Center
|
3234
|
|
4
|
French Embassy in Moscow
|
|
Nanocrystalline CeO2-ZrO2 (Ce:Zr 1:1) samples doped with La, Pr or Gd cations (containing up to 30 at.%) were prepared via the Pechini route. Pt (1.4 wt.%) was supported via impregnation with H2PtCl6 solution followed by drying and calcination. The samples’ surface features were studied by SIMS and FTIRS of adsorbed CO. The oxygen mobility was characterized by the dynamic oxygen isotope exchange and H2 TPR. Catalytic activity was studied in the flow
installation using diluted feeds (0.7% CH4 +0.5% O2 or 1% C3H6O + 0.5% O2 +0.5% H2O in He). In the selective oxidation of methane (POM), the catalytic activity correlates with Pt dispersion controlled by the oxidized sample’s ability to stabilize Pt2+ cations as precursors of small reactive Pt clusters formed under reaction conditions. This is favoured by a larger doping cation (La) and a developed network of nanodomain boundaries. At comparable Pt dispersion, the highest performance was demonstrated by a La-doped system, which correlates with the highest
surface/near-surface oxygen mobility controlled by the strength of Ce-O bonds in the surface layer. In the autothermal reforming of acetone, the activity trends differ from those in POM because of the more prominent role of the oxygen mobility required to prevent surface coking.