Effect of K, Cs and Ba on the kinetics of NH3 synthesis over carbon-based ruthenium catalysts

Wioletta Raróg-Pilecka , Zbigniew Kowalczyk , Jan Sentek , Dominik Składanowski , Jerzy Zieliński

Abstract

The kinetics of NH3 synthesis over carbon-based ruthenium catalysts promoted with barium or alkali was studied. Both the ammonia partial pressure dependencies of the reaction rates (T = 400°C, p = 63 bar, H2 : N2 = 3 : 1) and the pressure variations of the activity (T = 370°C, p= 4–63 bar, H2 : NN2 = 3 : 1) were found to be different for Ba and for the alkali (K, Cs). Ba–Ru/C proved to be more sensitive to the NH3 content and to the total pressure. The rate of synthesis over the alkali-promoted catalysts is, in turn, much stronger influenced by the ruthenium dispersion. TOFs of NH3 synthesis for the promoted samples at 370°C and 4 bar (Ba 0.085 1/s, Cs 0.05 1/s, K 0.035 1/s) are significantly higher than that for the Ru(0001) basal plane (0.0085 1/s results from the literature data at 370°C, 2 bar). The most active Ru/C samples (Ba or Cs) exceed significantly the fused iron catalyst, especially at high conversions.
Author Wioletta Raróg-Pilecka (FC / DITC)
Wioletta Raróg-Pilecka,,
- Department Of Inorganic Technology And Ceramics
, Zbigniew Kowalczyk - [Politechnika Warszawska]
Zbigniew Kowalczyk,,
-
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, Jan Sentek - [Warsaw University of Technology (PW)]
Jan Sentek,,
-
- Politechnika Warszawska
, Dominik Składanowski - [Politechnika Warszawska]
Dominik Składanowski,,
-
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, Jerzy Zieliński (FCEMP / IC)
Jerzy Zieliński,,
- The Institute of Chemistry
Journal seriesCatalysis Letters, ISSN 1011-372X, 1572-879X
Issue year2000
Vol68
No3-4
Pages163-168
Keywords in EnglishAmmonia synthesis, Catalysis, Industrial Chemistry/Chemical Engineering, Kinetics, Pharmacy, Physical Chemistry, promotional effect, Ruthenium catalysts
DOIDOI:10.1023/A:1019024629261
URL http://link.springer.com/article/10.1023/A%3A1019024629261
Score (nominal)0
Score sourcejournalList
Publication indicators Scopus Citations = 70; GS Citations = 69.0
Citation count*69 (2015-04-16)
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* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.
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