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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Detalles Bibliográficos
Publicado: 2012
Materias:
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
Temperature-programmed reduction
Time-resolved
X-ray absorption near edge spectroscopy
Amino acids
Crystal structure
Zirconium
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03603199_v37_n19_p14881_Zimicz
http://hdl.handle.net/20.500.12110/paper_03603199_v37_n19_p14881_Zimicz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_03603199_v37_n19_p14881_Zimicz
record_format dspace
spelling paper:paper_03603199_v37_n19_p14881_Zimicz2023-06-08T15:34:40Z Time-resolved in situ XANES study of the redox properties of Ce 0.9Zr 0.1O 2 mixed oxides 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. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03603199_v37_n19_p14881_Zimicz http://hdl.handle.net/20.500.12110/paper_03603199_v37_n19_p14881_Zimicz
institution Universidad de Buenos Aires
institution_str I-28
repository_str 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
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.
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
publishDate 2012
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03603199_v37_n19_p14881_Zimicz
http://hdl.handle.net/20.500.12110/paper_03603199_v37_n19_p14881_Zimicz
_version_ 1768544778536878080

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