Effect of potassium and barium on the stability of a carbon-supported ruthenium catalyst for the synthesis of ammonia

Zbigniew Kowalczyk , Sławomir Jodzis , Wioletta Raróg-Pilecka , Jerzy Zieliński , Jerzy Pielaszek

Abstract

The effect of potassium and barium on the activity and thermal stability of a carbon-based ruthenium catalyst for the synthesis of ammonia has been studied. Kinetic measurements in NH3 synthesis were carried out in a flow differential reactor operating at standard conditions (p=6 MPa, T=673 K, XNH3=8\%, H2 : N2=3 : 1). Overheating of the samples was carried out at 793 K for 24 h. The examinations have been supplemented by XRD and chemisorption studies for the characterization of the ruthenium dispersion as well as by studying the catalysts methanation. It has been found that the barium-promoted catalyst is more active in NH3 synthesis and more resistant to overheating than the catalyst promoted with potassium. The activity of Ba–Ru/C is much higher than that of a commercial fused-iron catalyst. This is important for industrial practice.
Author Zbigniew Kowalczyk
Zbigniew Kowalczyk,,
-
, Sławomir Jodzis ZTNC
Sławomir Jodzis,,
- Department Of Inorganic Technology And Ceramics
, Wioletta Raróg-Pilecka ZTNC
Wioletta Raróg-Pilecka,,
- Department Of Inorganic Technology And Ceramics
, Jerzy Zieliński ICh
Jerzy Zieliński,,
- The Institute of Chemistry
, Jerzy Pielaszek
Jerzy Pielaszek,,
-
Journal seriesApplied Catalysis A-General, ISSN 0926-860X
Issue year1998
Vol173
No2
Pages153-160
Keywords in EnglishActivity, Ammonia synthesis, Carbon support, Promoters (K, Ba), Ruthenium catalyst, Thermoresistance
DOIDOI:10.1016/S0926-860X(98)00175-6
URL http://www.sciencedirect.com/science/article/pii/S0926860X98001756
Score (nominal)35
Publication indicators WoS Impact Factor [Impact Factor WoS]: 2006 = 2.63 (2) - 2007=3.34 (5)
Citation count*102 (2015-04-16)
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