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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.
Wydawca
Czasopismo
Rocznik
Tom
Strony
349--356
Opis fizyczny
Bibliogr. 6 poz.
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autor
autor
autor
- Institute of Chemical and Environment Engineering, Szczecin University of Technology, ul. Pułaskiego 10, 70-322 Szczecin
Bibliografia
- [1] GRABKE H. J., Ber. Bunsenges. Phys. Chem., 4 (1968), 533.
- [2] GRABKE H. J., Archiv. Eisenhüttenwessen, 44 (1973), 603.
- [3] ARABCZYK W., ZAMŁYNNY J., Catal. Lett., 60 (1999), 167.
- [4] WRÓBEL R., ARABCZYK W., J. Phys. Chem. A, 110 (2006), 9219.
- [5] ARABCZYK W., WRÓBEL R., Solid State Phen., 94 (2003), 185.
- [6] ZAMŁYNNY J., Examination of kinetics of nitriding of ferrous catalyst (in Polish) PhD Thesis,
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPW7-0007-0202