New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition

Promising and highly novel catalysts based on ruthenium (Ru) supported on reduced graphene oxide were synthesized, characterized and tested for COx-free hydrogen generation by catalytic ammonia decomposition. Metal loading and amount of a pre-reducing agent clearly affect the catalytic properties of...

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Autores: Pinzón García, Marina, Aviles-Garcia, Osmin, Osa Puebla, Ana Raquel de la, Consuegra, Antonio de Lucas, Sánchez Paredes, Paula, Romero Izquierdo, Amaya
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universidad de Castilla-La Mancha
Repositorio:RUIdeRA. Repositorio Institucional de la UCLM
OAI Identifier:oai:ruidera.uclm.es:10578/29868
Acceso en línea:https://hdl.handle.net/10578/29868
Access Level:acceso abierto
Palabra clave:Ammonia decomposition
Ruthenium
Reduced graphene oxide
Hydrogen production
Descomposición de amoníaco
Rutenio
Óxido de grafeno reducido
Producción de hidrógeno
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spelling New catalysts based on reduced graphene oxide for hydrogen production from ammonia decompositionPinzón García, MarinaAviles-Garcia, OsminOsa Puebla, Ana Raquel de laConsuegra, Antonio de LucasSánchez Paredes, PaulaRomero Izquierdo, AmayaAmmonia decompositionRutheniumReduced graphene oxideHydrogen productionDescomposición de amoníacoRutenioÓxido de grafeno reducidoProducción de hidrógenoPromising and highly novel catalysts based on ruthenium (Ru) supported on reduced graphene oxide were synthesized, characterized and tested for COx-free hydrogen generation by catalytic ammonia decomposition. Metal loading and amount of a pre-reducing agent clearly affect the catalytic properties of the final catalysts. A Ru loading higher than 2.5 wt% resulted in Ru particles of size higher than 5 nm, which were agglomerated, thus decreasing the amount of the most active sites (B5 type-sites) and therefore the ammonia conversion. Additionally, a graphene oxide (GO) hydrothermal pre-reduction with 2-chloroethylamine hydrochloride, led materials with a more ordered structure which is associated with a good electronic conductivity and, higher basicity. Optimal catalytic activity is achieved using a reducing agent/GO ratio of 5/3 (wt/wt) and a Ru loading of 2.5 wt%. Thus, 2.5Ru/10C-rGO catalyst resulted in excellent hydrogen (H2) production from ammonia decomposition, with an ammonia conversion close to 96% and hydrogen production rate of 9.1 mmolH2 gcat−1 min−1 at 400 °C. Reduced graphene oxide proved to be a suitable support in the development of nanosized Ru catalysts being the optimal one highly active in COx-free hydrogen generation during more than 60 h of reaction, providing virtuous stability.Catalizadores prometedores y altamente novedosos basados ​​en rutenio (Ru) soportado en óxido de grafeno reducido fueron sintetizados, caracterizados y probados para CO x-generación de hidrógeno libre por descomposición catalítica de amoníaco. La carga de metal y la cantidad de un agente prerreductor afectan claramente las propiedades catalíticas de los catalizadores finales. Una carga de Ru superior al 2,5% en peso resultó en partículas de Ru de tamaño superior a 5 nm, que se aglomeraron, disminuyendo así la cantidad de los sitios más activos (sitios tipo B5) y por lo tanto la conversión de amoníaco. Además, una prerreducción hidrotermal de óxido de grafeno (GO) con clorhidrato de 2-cloroetilamina, llevó a materiales con una estructura más ordenada que se asocia con una buena conductividad electrónica y una mayor basicidad. La actividad catalítica óptima se logra utilizando una relación de agente reductor/GO de 5/3 (p/p) y una carga de Ru de 2,5 % en peso. Por lo tanto, el catalizador 2.5Ru/10C-rGO resultó en un excelente hidrógeno (H 2) producción a partir de la descomposición del amoníaco, con una conversión de amoníaco cercana al 96% y una tasa de producción de hidrógeno de 9,1 mmolH 2 g cat −1 min −1 a 400 °C. El óxido de grafeno reducido demostró ser un soporte adecuado en el desarrollo de catalizadores de Ru nanométricos siendo el óptimo altamente activo en la generación de hidrógeno libre de CO x durante más de 60 h de reacción, proporcionando una estabilidad virtuosa.Elsevier202220222022info:eu-repo/semantics/articleapplication/pdfapplication/pdfhttps://hdl.handle.net/10578/29868reponame:RUIdeRA. Repositorio Institucional de la UCLMinstname:Universidad de Castilla-La ManchaInglésSBPLY/180501/000281info:eu-repo/semantics/openAccessoai:ruidera.uclm.es:10578/298682026-05-27T07:36:41Z
dc.title.none.fl_str_mv New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
title New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
spellingShingle New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
Pinzón García, Marina
Ammonia decomposition
Ruthenium
Reduced graphene oxide
Hydrogen production
Descomposición de amoníaco
Rutenio
Óxido de grafeno reducido
Producción de hidrógeno
title_short New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
title_full New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
title_fullStr New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
title_full_unstemmed New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
title_sort New catalysts based on reduced graphene oxide for hydrogen production from ammonia decomposition
dc.creator.none.fl_str_mv Pinzón García, Marina
Aviles-Garcia, Osmin
Osa Puebla, Ana Raquel de la
Consuegra, Antonio de Lucas
Sánchez Paredes, Paula
Romero Izquierdo, Amaya
author Pinzón García, Marina
author_facet Pinzón García, Marina
Aviles-Garcia, Osmin
Osa Puebla, Ana Raquel de la
Consuegra, Antonio de Lucas
Sánchez Paredes, Paula
Romero Izquierdo, Amaya
author_role author
author2 Aviles-Garcia, Osmin
Osa Puebla, Ana Raquel de la
Consuegra, Antonio de Lucas
Sánchez Paredes, Paula
Romero Izquierdo, Amaya
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ammonia decomposition
Ruthenium
Reduced graphene oxide
Hydrogen production
Descomposición de amoníaco
Rutenio
Óxido de grafeno reducido
Producción de hidrógeno
topic Ammonia decomposition
Ruthenium
Reduced graphene oxide
Hydrogen production
Descomposición de amoníaco
Rutenio
Óxido de grafeno reducido
Producción de hidrógeno
description Promising and highly novel catalysts based on ruthenium (Ru) supported on reduced graphene oxide were synthesized, characterized and tested for COx-free hydrogen generation by catalytic ammonia decomposition. Metal loading and amount of a pre-reducing agent clearly affect the catalytic properties of the final catalysts. A Ru loading higher than 2.5 wt% resulted in Ru particles of size higher than 5 nm, which were agglomerated, thus decreasing the amount of the most active sites (B5 type-sites) and therefore the ammonia conversion. Additionally, a graphene oxide (GO) hydrothermal pre-reduction with 2-chloroethylamine hydrochloride, led materials with a more ordered structure which is associated with a good electronic conductivity and, higher basicity. Optimal catalytic activity is achieved using a reducing agent/GO ratio of 5/3 (wt/wt) and a Ru loading of 2.5 wt%. Thus, 2.5Ru/10C-rGO catalyst resulted in excellent hydrogen (H2) production from ammonia decomposition, with an ammonia conversion close to 96% and hydrogen production rate of 9.1 mmolH2 gcat−1 min−1 at 400 °C. Reduced graphene oxide proved to be a suitable support in the development of nanosized Ru catalysts being the optimal one highly active in COx-free hydrogen generation during more than 60 h of reaction, providing virtuous stability.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/10578/29868
url https://hdl.handle.net/10578/29868
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv SBPLY/180501/000281
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:RUIdeRA. Repositorio Institucional de la UCLM
instname:Universidad de Castilla-La Mancha
instname_str Universidad de Castilla-La Mancha
reponame_str RUIdeRA. Repositorio Institucional de la UCLM
collection RUIdeRA. Repositorio Institucional de la UCLM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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