Properties and activity of the cobalt catalysts for NH3 synthesis obtained by co-precipitation – the effect of lanthanum addition

• Authors: Magdalena Zybert , Magdalena Karasińska , Elżbieta Truszkiewicz , Bogusław Mierzwa , Wioletta Raróg-Pilecka
• Languages of publication: EN

Abstracts

EN

In modern research on catalysts for NH3 synthesis a lot of attention is paid to cobalt. In this work the new catalytic systems based on cobalt are presented. Unsupported cobalt catalysts singly promoted (La or Ba) and doubly promoted (La and Ba) were prepared and tested in NH3 synthesis reaction under commercial synthesis conditions. Characterization studies revealed that lanthanum plays a role of a structural promoter, which improves the surface of catalyst precursors and prevents from sintering during calcination. However, lanthanum has a negative effect on the reduction of cobalt oxide, but the addition of barium promoter (Co/La/Ba catalyst) diminishes the negative impact of La. The co-promotion of cobalt with lanthanum and barium results in the increasing of the active phase surface and improvement of its activity in NH3 synthesis.

Keywords

EN

ammonia synthesis; cobalt catalyst; promoter; lanthanum; co-precipitation

• Publisher: De Gruyter Open
• Journal: Polish Journal of Chemical Technology
• Year: 2015
• Volume: 17
• Issue: 1
• Pages: 138-143

Dates

published

1 - 3 - 2015

online

25 - 3 - 2015

Contributors

author

Magdalena Zybert

• Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland

author

Magdalena Karasińska

• Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland

author

Elżbieta Truszkiewicz

• Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland

author

Bogusław Mierzwa

• Institute of Physical Chemistry of the Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland

author

Wioletta Raróg-Pilecka

• Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland

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Identifiers

DOI

10.1515/pjct-2015-0020