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1
The Influence of Hydrogen Sulphide on the Kinetics of Ammonia Decomposition over a Doubly Promoted Iron Catalyst
100%
Arabczyk W. , Zamłynny J. , Moszyński D.
Polish Journal of Chemistry
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2006
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tom Vol. 80, nr 2
345-350
EN
The kinetics of ammonia decomposition over an iron catalyst poisoned with sulphur has been studied. The relative activity of this catalyst decreases with increasing concentration of sulphur and increases with increasing temperature. As the simple site-blocking mechanism of poisoning cannot explain this behaviour, the formation of stable sulphur compounds and the evolution of the catalysts' active surface with the temperature was proposed to account for the results.
2
Content available remote Characterization of FeCo based catalyst for ammonia decomposition. The effect of potassium oxide
100%
Lendzion-Bieluń Z. , Pelka R. , Czekajło Ł.
Polish Journal of Chemical Technology
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2014
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tom 16
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nr 4
111-116
EN
FeCo fused catalyst was obtained by fusing iron and cobalt oxides with an addition of calcium, aluminium, and potassium oxides (CaO, Al2O3, K2O). An additional amount of potassium oxide was inserted by wet impregnation. Chemical composition of the prepared catalysts was determined with an aid of the XRF method. On the basis of XRD analysis it was found that cobalt was built into the structure of magnetite and solid solution of CoFe2O4 was formed. An increase in potassium content develops surface area of the reduced form of the catalyst, number of adsorption sites for hydrogen, and the ammonia decomposition rate. The nitriding process of the catalyst slows down the ammonia decomposition.
3
Ammonia Decomposition over Iron in the Presence of Water Vapor
100%
Arabczyk W. , Zamłynny J. , Moszyński D. , Kałucki K.
Polish Journal of Chemistry
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2005
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tom Vol. 79 / nr 9
1495-1501
EN
The ammonia decomposition over iron in the presence of water vapor has been studied. Water vapor retards this process, though no change of the apparent activation energy is observed. Despite noticeable influence of the water vapor on the rate of ammonia decomposition the sticking coefficient of ammonia on iron is not affected. Those observations were explained by the retardation of nitrogen molecules recombination on the iron surface due to the presence of oxygen atoms. The positive influence of water vapor on the rate of iron nitriding is also elucidated.
4
Content available Characterization of FeCo based catalyst for ammonia decomposition. The effect of potassium oxide
100%
Lendzion-Bieluń Z. , Pelka R. , Czekajło Ł.
Polish Journal of Chemical Technology
|
2014
|
tom Vol. 16, nr 4
111--116
EN
FeCo fused catalyst was obtained by fusing iron and cobalt oxides with an addition of calcium, aluminium, and potassium oxides (CaO, Al2O3, K2O). An additional amount of potassium oxide was inserted by wet impregnation. Chemical composition of the prepared catalysts was determined with an aid of the XRF method. On the basis of XRD analysis it was found that cobalt was built into the structure of magnetite and solid solution of CoFe2O4 was formed. An increase in potassium content develops surface area of the reduced form of the catalyst, number of adsorption sites for hydrogen, and the ammonia decomposition rate. The nitriding process of the catalyst slows down the ammonia decomposition.
5
Content available remote The influence of iron nanocrystallite size on a nitriding process rate
88%
Pelka R. , Glinka P. , Arabczyk W.
Materials Science Poland
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2008
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tom Vol. 26, No. 2
349--356
EN
In the course of nitriding process of nanocrystalline iron promoted with aluminum and calcium oxides, nitrides such as Fe4N and Fe3-2N were fabricated. The process rate was studied making use of a flow differential tubular reactor with thermogravimetric measurement of mass changes. Nanocrystalline iron was reduced under hydrogen atmosphere at 500 oC and 800 oC. Average crystallite sizes determined by the XRD method after reduction performed at 500 oC as well as at 800 oC and after passivation were 18 and 42 nm, respectively. The nitriding process rate as well as catalytic ammonia decomposition rate were limited by the ammonia dissociative adsorption rate on the surface of iron and were dependent on the ratio of the crystallite surface area to crystallite volume. Obtained results were explained based on the adsorption range model.
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