Stability Studies of Highly Active Cobalt Catalyst for the Ammonia Synthesis Process

Magdalena Zybert (), Hubert Ronduda, Wojciech Patkowski, Weronika Rybińska, Andrzej Ostrowski, Kamil Sobczak and Wioletta Raróg-Pilecka
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Magdalena Zybert: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
Hubert Ronduda: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
Wojciech Patkowski: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
Weronika Rybińska: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
Andrzej Ostrowski: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
Kamil Sobczak: Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland
Wioletta Raróg-Pilecka: Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland

Energies, 2023, vol. 16, issue 23, 1-15

Abstract: Ammonia is currently considered a promising compound for the chemical storage of hydrogen and as an energy carrier. However, large-scale ammonia production is not possible without an active and stable catalyst enabling efficient, long-term work without the need for its replacement. In this paper, the extended stability studies of the highly active promoted cobalt catalyst for ammonia synthesis were carried out. The long-term activity measurements in NH 3 synthesis reaction under conditions close to the industrial ones (400–470 °C, 6.3 MPa, H 2 /N 2 = 3) were compiled with the characterization of catalyst properties on different stages of its work using N 2 physisorption, XRPD, STEM-EDX, and H 2 -TPD. The accelerated aging method was used to simulate the deterioration of catalyst performance during industrial operation. Textural and structural characteristics revealed that the tested catalyst is highly resistant to high temperatures. The lack of significant changes in the specific surface area, morphology of the catalyst particles, surface distribution of elements, and chemisorption properties of cobalt surface during long-term heating (436 h) at 600 °C suggests that stable operation of the catalyst is possible in an ammonia synthesis reactor in the temperature range of 400–470 °C without the risk of losing its beneficial catalytic properties over time. The decline in catalyst activity during the long-term stability test was less than 10%.

Keywords: ammonia synthesis; cobalt catalyst; stability; catalyst deactivation; accelerated aging (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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