Surface properties of wustite based iron-cobalt catalysts for ammonia synthesis reaction

• Published in: Catalysis communications 2020-03, Vol.136, p.105907, Article 105907
• Main Authors: Lendzion-Bieluń, Zofia, Jurkowski, Artur
• Format: Article
• Language: English
• Subjects: Ammonia synthesis; Cobalt oxide; TPD-H2; Wustite
• ISSN: 1566-7367; 1873-3905
• DOI: 10.1016/j.catcom.2019.105907

In this work, surface properties of wustite-based iron and iron‑cobalt catalysts were investigated. Measurements of hydrogen temperature-programmed desorption (TPD-H2) and surface area of active forms of catalysts were conducted after reduction of catalyst precursors (16 h) in pure hydrogen at various temperatures (450, 475, 500, 550 and 600 °C). The amount of cobalt in the catalyst structure and the number of adsorption sites relative to hydrogen were correlated with the activity for ammonia synthesis reaction. The presence of cobalt increased thermal resistance of the catalysts and at the same time their activity in ammonia synthesis reaction. [Display omitted] •The introduction of cobalt into the wustite-iron catalyst structure for ammonia synthesis.•Addition of cobalt(II) oxide increased the catalyst activity in the ammonia synthesis reaction.•Influence of the wustite catalyst reduction temperature on its activity in the ammonia synthesis.•The promotion of cobalt(II) oxide improved the resistance to overheating.