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Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface

To compare the inherent methanol steam reforming properties of intermetallic compounds and a corresponding intermetallic compound–oxide interface, we selected the Cu–In system as a model to correlate the stability limits, self-activation and redox activation properties with the catalytic performance...

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Autores principales: Ploner, Kevin, Doran, Andrew, Kunz, Martin, Gili, Albert, Gurlo, Aleksander, Köwitsch, Nicolas, Armbrüster, Marc, Bernardi, Johannes, Watschinger, Maximilian, Penner, Simon
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/PMC8365629/
https://www.ncbi.nlm.nih.gov/pubmed/34457240
http://dx.doi.org/10.1039/d1cy00913c
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author Ploner, Kevin
Doran, Andrew
Kunz, Martin
Gili, Albert
Gurlo, Aleksander
Köwitsch, Nicolas
Armbrüster, Marc
Bernardi, Johannes
Watschinger, Maximilian
Penner, Simon
author_facet Ploner, Kevin
Doran, Andrew
Kunz, Martin
Gili, Albert
Gurlo, Aleksander
Köwitsch, Nicolas
Armbrüster, Marc
Bernardi, Johannes
Watschinger, Maximilian
Penner, Simon
author_sort Ploner, Kevin
collection PubMed
description To compare the inherent methanol steam reforming properties of intermetallic compounds and a corresponding intermetallic compound–oxide interface, we selected the Cu–In system as a model to correlate the stability limits, self-activation and redox activation properties with the catalytic performance. Three distinct intermetallic Cu–In compounds – Cu(7)In(3), Cu(2)In and Cu(11)In(9) – were studied both in an untreated and redox-activated state resulting from alternating oxidation–reduction cycles. The stability of all studied intermetallic compounds during methanol steam reforming (MSR) operation is essentially independent of the initial stoichiometry and all accordingly resist substantial structural changes. The inherent activity under batch MSR conditions is highest for Cu(2)In, corroborating the results of a Cu(2)In/In(2)O(3) sample accessed through reactive metal–support interaction. Under flow MSR operation, Cu(7)In(3) displays considerable deactivation, while Cu(2)In and Cu(11)In(9) feature stable performance at simultaneously high CO(2) selectivity. The missing significant self-activation is most evident in the operando thermogravimetric experiments, where no oxidation is detected for any of the intermetallic compounds. In situ X-ray diffraction allowed us to monitor the partial decomposition and redox activation of the Cu–In intermetallic compounds into Cu0.9In0.1/In(2)O(3) (from Cu(7)In(3)), Cu(7)In(3)/In(2)O(3) (from Cu(2)In) and Cu(7)In(3)/Cu0.9In0.1/In(2)O(3) (from Cu(11)In(9)) interfaces with superior MSR performance compared to the untreated samples. Although the catalytic profiles appear surprisingly similar, the latter interface with the highest indium content exhibits the least deactivation, which we explain by formation of stabilizing In(2)O(3) patches under MSR conditions.
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spelling pubmed-83656292021-08-25 Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface Ploner, Kevin Doran, Andrew Kunz, Martin Gili, Albert Gurlo, Aleksander Köwitsch, Nicolas Armbrüster, Marc Bernardi, Johannes Watschinger, Maximilian Penner, Simon Catal Sci Technol Chemistry To compare the inherent methanol steam reforming properties of intermetallic compounds and a corresponding intermetallic compound–oxide interface, we selected the Cu–In system as a model to correlate the stability limits, self-activation and redox activation properties with the catalytic performance. Three distinct intermetallic Cu–In compounds – Cu(7)In(3), Cu(2)In and Cu(11)In(9) – were studied both in an untreated and redox-activated state resulting from alternating oxidation–reduction cycles. The stability of all studied intermetallic compounds during methanol steam reforming (MSR) operation is essentially independent of the initial stoichiometry and all accordingly resist substantial structural changes. The inherent activity under batch MSR conditions is highest for Cu(2)In, corroborating the results of a Cu(2)In/In(2)O(3) sample accessed through reactive metal–support interaction. Under flow MSR operation, Cu(7)In(3) displays considerable deactivation, while Cu(2)In and Cu(11)In(9) feature stable performance at simultaneously high CO(2) selectivity. The missing significant self-activation is most evident in the operando thermogravimetric experiments, where no oxidation is detected for any of the intermetallic compounds. In situ X-ray diffraction allowed us to monitor the partial decomposition and redox activation of the Cu–In intermetallic compounds into Cu0.9In0.1/In(2)O(3) (from Cu(7)In(3)), Cu(7)In(3)/In(2)O(3) (from Cu(2)In) and Cu(7)In(3)/Cu0.9In0.1/In(2)O(3) (from Cu(11)In(9)) interfaces with superior MSR performance compared to the untreated samples. Although the catalytic profiles appear surprisingly similar, the latter interface with the highest indium content exhibits the least deactivation, which we explain by formation of stabilizing In(2)O(3) patches under MSR conditions. The Royal Society of Chemistry 2021-07-23 /pmc/articles/PMC8365629/ /pubmed/34457240 http://dx.doi.org/10.1039/d1cy00913c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Ploner, Kevin
Doran, Andrew
Kunz, Martin
Gili, Albert
Gurlo, Aleksander
Köwitsch, Nicolas
Armbrüster, Marc
Bernardi, Johannes
Watschinger, Maximilian
Penner, Simon
Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
title Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
title_full Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
title_fullStr Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
title_full_unstemmed Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
title_short Steering the methanol steam reforming reactivity of intermetallic Cu–In compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
title_sort steering the methanol steam reforming reactivity of intermetallic cu–in compounds by redox activation: stability vs. formation of an intermetallic compound–oxide interface
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8365629/
https://www.ncbi.nlm.nih.gov/pubmed/34457240
http://dx.doi.org/10.1039/d1cy00913c
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