Effect of Potassium on the Kinetics of Ammonia Synthesis and Decomposition over Fused Iron Catalyst at Atmospheric Pressure

Z. Kowalczyk , J. Sentek , Sławomir Jodzis , M. Muhler , O. Hinrichsen

Abstract

Ammonia synthesis and decomposition have been performed over a doublypromoted (Al2O3, CaO) and a triply promoted (Al2O3, CaO, K2O) fused iron catalyst at atmospheric pressure. Additionally, the temperature-programmed surface reaction (TPSR) of Nadswith H2has been studied over both catalysts. No effect of potassium on the turnover frequency of NH3synthesis was found. On the contrary, a significant fivefold increase in the rate of NH3decomposition in the presence of potassium was observed. The effect was found to be strongly dependent on the concentration of NH3in the gas phase. The promoting mechanism of potassium is discussed in relation to the surface structure of the catalyst under varying operating conditions.
Author Z. Kowalczyk - [Politechnika Warszawska]
Z. Kowalczyk,,
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, J. Sentek - [Warsaw University of Technology (PW)]
J. Sentek,,
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- Politechnika Warszawska
, Sławomir Jodzis (FC / CChT)
Sławomir Jodzis,,
- Chair of Chemical Technology
, M. Muhler - [Fritz Haber Institute of the Max Planck Society]
M. Muhler,,
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, O. Hinrichsen - [Fritz Haber Institute of the Max Planck Society]
O. Hinrichsen,,
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Journal seriesJournal of Catalysis, ISSN 0021-9517
Issue year1997
Vol169
No2
Pages407-414
ASJC Classification1606 Physical and Theoretical Chemistry; 1503 Catalysis
DOIDOI:10.1006/jcat.1997.1664
URL http://www.sciencedirect.com/science/article/pii/S002195179791664X
Score (nominal)45
Score sourcejournalList
Publication indicators Scopus Citations = 57; WoS Citations = 56; Scopus SNIP (Source Normalised Impact per Paper): 1999 = 1.938; WoS Impact Factor: 2006 = 4.533 (2) - 2007=5.11 (5)
Citation count*49 (2015-04-06)
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