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A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis

Ammonia synthesis was performed over a barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide. The rate of NH(3) formation over this catalyst was about 3.5 times higher than that over the unpromoted catalyst at 9 MPa and 400 °C. Furthermore, no sign of thermal deactivation was...

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Autores principales: Ronduda, Hubert, Zybert, Magdalena, Patkowski, Wojciech, Ostrowski, Andrzej, Jodłowski, Przemysław, Szymański, Damian, Kępiński, Leszek, Raróg-Pilecka, Wioletta
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/PMC8697810/
https://www.ncbi.nlm.nih.gov/pubmed/35423907
http://dx.doi.org/10.1039/d1ra01584b
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author Ronduda, Hubert
Zybert, Magdalena
Patkowski, Wojciech
Ostrowski, Andrzej
Jodłowski, Przemysław
Szymański, Damian
Kępiński, Leszek
Raróg-Pilecka, Wioletta
author_facet Ronduda, Hubert
Zybert, Magdalena
Patkowski, Wojciech
Ostrowski, Andrzej
Jodłowski, Przemysław
Szymański, Damian
Kępiński, Leszek
Raróg-Pilecka, Wioletta
author_sort Ronduda, Hubert
collection PubMed
description Ammonia synthesis was performed over a barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide. The rate of NH(3) formation over this catalyst was about 3.5 times higher than that over the unpromoted catalyst at 9 MPa and 400 °C. Furthermore, no sign of thermal deactivation was observed during long-term overheating at 600 °C for 360 h. The results of physicochemical studies, including XRPD, DRIFTS, H(2)-TPD, CO(2)-TPD, N(ads) + H(2) TPSR and kinetic analysis, revealed that the addition of Ba promoter increased the surface basicity of the catalyst and modified the adsorption properties of the Co surface towards H(2) and NH(3). The decreased adsorption strength of the corresponding sites towards hydrogen and ammonia resulted in greater availability of active sites in the Ba-promoted cobalt catalyst. These characteristics are considered to have a profound effect on the performance of this catalyst in NH(3) synthesis.
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spelling pubmed-86978102022-04-13 A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis Ronduda, Hubert Zybert, Magdalena Patkowski, Wojciech Ostrowski, Andrzej Jodłowski, Przemysław Szymański, Damian Kępiński, Leszek Raróg-Pilecka, Wioletta RSC Adv Chemistry Ammonia synthesis was performed over a barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide. The rate of NH(3) formation over this catalyst was about 3.5 times higher than that over the unpromoted catalyst at 9 MPa and 400 °C. Furthermore, no sign of thermal deactivation was observed during long-term overheating at 600 °C for 360 h. The results of physicochemical studies, including XRPD, DRIFTS, H(2)-TPD, CO(2)-TPD, N(ads) + H(2) TPSR and kinetic analysis, revealed that the addition of Ba promoter increased the surface basicity of the catalyst and modified the adsorption properties of the Co surface towards H(2) and NH(3). The decreased adsorption strength of the corresponding sites towards hydrogen and ammonia resulted in greater availability of active sites in the Ba-promoted cobalt catalyst. These characteristics are considered to have a profound effect on the performance of this catalyst in NH(3) synthesis. The Royal Society of Chemistry 2021-04-15 /pmc/articles/PMC8697810/ /pubmed/35423907 http://dx.doi.org/10.1039/d1ra01584b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Ronduda, Hubert
Zybert, Magdalena
Patkowski, Wojciech
Ostrowski, Andrzej
Jodłowski, Przemysław
Szymański, Damian
Kępiński, Leszek
Raróg-Pilecka, Wioletta
A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
title A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
title_full A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
title_fullStr A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
title_full_unstemmed A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
title_short A high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
title_sort high performance barium-promoted cobalt catalyst supported on magnesium–lanthanum mixed oxide for ammonia synthesis
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8697810/
https://www.ncbi.nlm.nih.gov/pubmed/35423907
http://dx.doi.org/10.1039/d1ra01584b
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