Synergistic Interaction of Cerium and Barium-New Insight into the Promotion Effect in Cobalt Systems for Ammonia Synthesis

Aleksandra Tarka , Wojciech Patkowski , Magdalena Zybert , Hubert Ronduda , Piotr Wieciński , Paweł Adamski , Adam Sarnecki , Dariusz Moszyński , Wioletta Raróg-Pilecka

Abstract

This study explains a co-promoting interaction of cerium and barium additives in a cobalt catalyst used for ammonia synthesis. The results show that a synergistic effect of Ce and Ba promoters in the catalyst is associated with an emergence of a third promoter—BaCeO3—which forms in situ from its individual components during catalyst activation. The influence of perovskite-type barium cerate is substantial due to its strong basic properties, i.e. high electron-donating ability and a tendency to stabilize the Co hcp cobalt phase (more active in ammonia synthesis than the Co fcc phase). BaCeO3 diversifies the structure of adsorption sites on the cobalt surface by contributing to the exposure of facets with more favourable adsorption and binding energies with regards to rate-limiting reactions steps. It allows to a more fluent formation and transfer of species unrestricted by the hydrogen or product poisoning consequently accelerating the entire ammonia synthesis process.
Author Aleksandra Tarka (FC / CChT)
Aleksandra Tarka,,
- Chair of Chemical Technology
, Wojciech Patkowski (FC / CChT)
Wojciech Patkowski,,
- Chair of Chemical Technology
, Magdalena Zybert (FC / CChT)
Magdalena Zybert,,
- Chair of Chemical Technology
, Hubert Ronduda (FC / CChT)
Hubert Ronduda,,
- Chair of Chemical Technology
, Piotr Wieciński (FC / CChT)
Piotr Wieciński,,
- Chair of Chemical Technology
, Paweł Adamski - [Faculty of Chemical Technology and Engineering (WTIICH) [Zachodniopomorski Uniwersytet Technologiczny w Szczecinie (ZUT)]]
Paweł Adamski,,
-
- Wydział Technologii i Inżynierii Chemicznej
, Adam Sarnecki - [Faculty of Chemical Technology and Engineering (WTIICH) [Zachodniopomorski Uniwersytet Technologiczny w Szczecinie (ZUT)]]
Adam Sarnecki,,
-
- Wydział Technologii i Inżynierii Chemicznej
, Dariusz Moszyński - Faculty of Chemical Technology and Engineering (WTIICH) [Zachodniopomorski Uniwersytet Technologiczny w Szczecinie (ZUT)]
Dariusz Moszyński,,
-
, Wioletta Raróg-Pilecka (FC / CChT)
Wioletta Raróg-Pilecka,,
- Chair of Chemical Technology
Journal seriesCatalysts, ISSN 2073-4344
Issue year2020
Vol10
No6
Pages1-17
Publication size in sheets0.8
Article number658
Keywords in Englishammonia synthesis, cobalt catalyst, synergistic effect, cerium promoter, barium promoter, barium cerate
ASJC Classification1503 Catalysis; 1606 Physical and Theoretical Chemistry
DOIDOI:10.3390/catal10060658
URL https://www.mdpi.com/2073-4344/10/6/658
Languageen angielski
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 24-09-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.912; WoS Impact Factor: 2018 = 3.444 (2) - 2018=3.808 (5)
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