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Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process

NiWO(4) with a volumetric storage density (VSD) of 496 g L(−1) was studied to evaluate its H(2) storage potential as an oxygen carrier under a chemical looping (CL) process scheme. The material was synthesized by precipitation and calcined at 950 °C for 5 hours in air. Characterization consisted in...

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Autores principales: González-Vargas, P. E., Salinas-Gutiérrez, J. M., Meléndez-Zaragoza, M. J., Pantoja-Espinoza, J. C., López-Ortiz, A., Collins-Martínez, V.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9040647/
https://www.ncbi.nlm.nih.gov/pubmed/35479527
http://dx.doi.org/10.1039/d1ra05077j
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author González-Vargas, P. E.
Salinas-Gutiérrez, J. M.
Meléndez-Zaragoza, M. J.
Pantoja-Espinoza, J. C.
López-Ortiz, A.
Collins-Martínez, V.
author_facet González-Vargas, P. E.
Salinas-Gutiérrez, J. M.
Meléndez-Zaragoza, M. J.
Pantoja-Espinoza, J. C.
López-Ortiz, A.
Collins-Martínez, V.
author_sort González-Vargas, P. E.
collection PubMed
description NiWO(4) with a volumetric storage density (VSD) of 496 g L(−1) was studied to evaluate its H(2) storage potential as an oxygen carrier under a chemical looping (CL) process scheme. The material was synthesized by precipitation and calcined at 950 °C for 5 hours in air. Characterization consisted in XRD, BET surface area, SEM and EDS analysis. NiWO(4) hydrogen storage reduction-oxidation evaluation was performed by TGA using 5% v H(2)/Ar and 2.2% v H(2)O/Ar at 800 °C. Global kinetics for the reduction step was studied from 730 to 870 °C using 2 to 5% v of H(2)/Ar. While oxidation kinetics was examined from 730 to 870 °C using 0.8 to 2.2% v H(2)O/Ar. A hydrogen storage multicycle stability test was performed by exposing NiWO(4) to 17 consecutive redox cycles. XRD results of the synthesized material indicate NiWO(4) as the only crystalline phase. Fully reduced material found only W and Ni species, while reoxidation led back to NiWO(4). BET surface area of synthesized material was 4.25 m(2) g(−1). SEM results showed fresh NiWO(4) composed of non-porous large particles (1–5 μm). After reduction, the material shown a porous coral-like morphology with particles between 50 to 100 nm. EDS analysis results confirmed the compositions of the reduced (Ni + W) and fully oxidized NiWO(4) species, respectively. Oxygen carrier reaction conversions for both reduction and regeneration steps were 100%. Global kinetic studies indicate a first order reaction for the two reduction steps and during oxidation, with activation energies of 22.1, 48.4 and 53.4 kJ mol(−1) for the two reduction and oxidation steps, respectively. NiWO(4) multicycle stability test shown no loss of VSD and fast reduction and oxidation kinetics under the studied conditions after seventeen consecutive redox cycles, which confirms the potential of this material with respect to current oxygen carriers reported in the literature for hydrogen storage applications.
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spelling pubmed-90406472022-04-26 Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process González-Vargas, P. E. Salinas-Gutiérrez, J. M. Meléndez-Zaragoza, M. J. Pantoja-Espinoza, J. C. López-Ortiz, A. Collins-Martínez, V. RSC Adv Chemistry NiWO(4) with a volumetric storage density (VSD) of 496 g L(−1) was studied to evaluate its H(2) storage potential as an oxygen carrier under a chemical looping (CL) process scheme. The material was synthesized by precipitation and calcined at 950 °C for 5 hours in air. Characterization consisted in XRD, BET surface area, SEM and EDS analysis. NiWO(4) hydrogen storage reduction-oxidation evaluation was performed by TGA using 5% v H(2)/Ar and 2.2% v H(2)O/Ar at 800 °C. Global kinetics for the reduction step was studied from 730 to 870 °C using 2 to 5% v of H(2)/Ar. While oxidation kinetics was examined from 730 to 870 °C using 0.8 to 2.2% v H(2)O/Ar. A hydrogen storage multicycle stability test was performed by exposing NiWO(4) to 17 consecutive redox cycles. XRD results of the synthesized material indicate NiWO(4) as the only crystalline phase. Fully reduced material found only W and Ni species, while reoxidation led back to NiWO(4). BET surface area of synthesized material was 4.25 m(2) g(−1). SEM results showed fresh NiWO(4) composed of non-porous large particles (1–5 μm). After reduction, the material shown a porous coral-like morphology with particles between 50 to 100 nm. EDS analysis results confirmed the compositions of the reduced (Ni + W) and fully oxidized NiWO(4) species, respectively. Oxygen carrier reaction conversions for both reduction and regeneration steps were 100%. Global kinetic studies indicate a first order reaction for the two reduction steps and during oxidation, with activation energies of 22.1, 48.4 and 53.4 kJ mol(−1) for the two reduction and oxidation steps, respectively. NiWO(4) multicycle stability test shown no loss of VSD and fast reduction and oxidation kinetics under the studied conditions after seventeen consecutive redox cycles, which confirms the potential of this material with respect to current oxygen carriers reported in the literature for hydrogen storage applications. The Royal Society of Chemistry 2021-09-02 /pmc/articles/PMC9040647/ /pubmed/35479527 http://dx.doi.org/10.1039/d1ra05077j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
González-Vargas, P. E.
Salinas-Gutiérrez, J. M.
Meléndez-Zaragoza, M. J.
Pantoja-Espinoza, J. C.
López-Ortiz, A.
Collins-Martínez, V.
Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process
title Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process
title_full Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process
title_fullStr Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process
title_full_unstemmed Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process
title_short Reduction and oxidation kinetics of NiWO(4) as an oxygen carrier for hydrogen storage by a chemical looping process
title_sort reduction and oxidation kinetics of niwo(4) as an oxygen carrier for hydrogen storage by a chemical looping process
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9040647/
https://www.ncbi.nlm.nih.gov/pubmed/35479527
http://dx.doi.org/10.1039/d1ra05077j
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