Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides
The aim of this paper is to gain further insight in the reduction and reoxidation processes taking place when Ce 0.9Zr 0.1O 2 mixed oxides are in reducing or oxidizing atmospheres, respectively. The reduction process of these mixed oxides synthesized by two stoichiometric nitrate-aminoacid gel-combu...
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todo:paper_03603199_v37_n19_p14881_Zimicz2023-10-03T15:26:26Z Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides Zimicz, M.G. Larrondo, S.A. Prado, R.J. Lamas, D.G. Ce 0.9Zr 0.1O 2 Reduction-reoxidation TPR XANES Absorption edges Gel-combustion In-situ Mixed oxide Oxidizing atmosphere Pore volume Re-oxidation Redox process Redox property Reduction process Reduction-reoxidation Temperature-programmed reduction Time-resolved TPR X-ray absorption near edge spectroscopy XANES Amino acids Crystal structure Zirconium The aim of this paper is to gain further insight in the reduction and reoxidation processes taking place when Ce 0.9Zr 0.1O 2 mixed oxides are in reducing or oxidizing atmospheres, respectively. The reduction process of these mixed oxides synthesized by two stoichiometric nitrate-aminoacid gel-combustion routes using glycine and lysine as fuels is studied by conventional H 2-Temperature Programmed Reduction experiments. The results are compared with those obtained by time-resolved in situ X-ray absorption near-edge spectroscopy (XANES) in the energy level corresponding to the Ce L III absorption edge. The reoxidation process by this last technique is also studied. Even though the identical composition and crystal structure of both samples, the redox processes resulted very different for each solid, suggesting the influence of specific surface area, pore volume and particle size on them. © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03603199_v37_n19_p14881_Zimicz |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Ce 0.9Zr 0.1O 2 Reduction-reoxidation TPR XANES Absorption edges Gel-combustion In-situ Mixed oxide Oxidizing atmosphere Pore volume Re-oxidation Redox process Redox property Reduction process Reduction-reoxidation Temperature-programmed reduction Time-resolved TPR X-ray absorption near edge spectroscopy XANES Amino acids Crystal structure Zirconium |
| spellingShingle |
Ce 0.9Zr 0.1O 2 Reduction-reoxidation TPR XANES Absorption edges Gel-combustion In-situ Mixed oxide Oxidizing atmosphere Pore volume Re-oxidation Redox process Redox property Reduction process Reduction-reoxidation Temperature-programmed reduction Time-resolved TPR X-ray absorption near edge spectroscopy XANES Amino acids Crystal structure Zirconium Zimicz, M.G. Larrondo, S.A. Prado, R.J. Lamas, D.G. Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides |
| topic_facet |
Ce 0.9Zr 0.1O 2 Reduction-reoxidation TPR XANES Absorption edges Gel-combustion In-situ Mixed oxide Oxidizing atmosphere Pore volume Re-oxidation Redox process Redox property Reduction process Reduction-reoxidation Temperature-programmed reduction Time-resolved TPR X-ray absorption near edge spectroscopy XANES Amino acids Crystal structure Zirconium |
| description |
The aim of this paper is to gain further insight in the reduction and reoxidation processes taking place when Ce 0.9Zr 0.1O 2 mixed oxides are in reducing or oxidizing atmospheres, respectively. The reduction process of these mixed oxides synthesized by two stoichiometric nitrate-aminoacid gel-combustion routes using glycine and lysine as fuels is studied by conventional H 2-Temperature Programmed Reduction experiments. The results are compared with those obtained by time-resolved in situ X-ray absorption near-edge spectroscopy (XANES) in the energy level corresponding to the Ce L III absorption edge. The reoxidation process by this last technique is also studied. Even though the identical composition and crystal structure of both samples, the redox processes resulted very different for each solid, suggesting the influence of specific surface area, pore volume and particle size on them. © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. |
| format |
JOUR |
| author |
Zimicz, M.G. Larrondo, S.A. Prado, R.J. Lamas, D.G. |
| author_facet |
Zimicz, M.G. Larrondo, S.A. Prado, R.J. Lamas, D.G. |
| author_sort |
Zimicz, M.G. |
| title |
Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides |
| title_short |
Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides |
| title_full |
Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides |
| title_fullStr |
Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides |
| title_full_unstemmed |
Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides |
| title_sort |
time-resolved in situ xanes study of the redox properties of ce 0.9zr 0.1o 2 mixed oxides |
| url |
http://hdl.handle.net/20.500.12110/paper_03603199_v37_n19_p14881_Zimicz |
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