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
AbstractAmmonia 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.
|Journal series||Journal of Catalysis, ISSN 0021-9517|
|Publication indicators||= 57; = 56; : 1999 = 1.938; : 2006 = 4.533 (2) - 2007=5.11 (5)|
|Citation count*||49 (2015-04-06)|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.