Author： Kowalska-Kuś J. Held A. Nowińska K.
Publisher： Springer Publishing Company
ISSN： 1011-372X
Source： Catalysis Letters, Vol.136, Iss.3-4, 2010-06, pp. : 199-208
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Abstract
Iron modified zeolites of MFI structure, calcined at 873 and 1173 K, were doped with sodium cations in amounts corresponding to ¼, ½, ¾ and to the total number of acidic centres, estimated from TPD of ammonia. Sodium modified Fe-ZSM-5(900) gradually lost their oxidative activity with an increase in the concentration of alkaline cations, while the activity of Na/Fe-ZSM-5(600) changed slightly and diminished considerably only after significant removal of acidic centres. The results of propane ODH reaction, performed at different contact times over alkaline free and alkaline modified Fe-ZSM-5 indicated, that oxydehydrogenation and cracking reactions on the samples calcined at 1173 K occurred as consecutive reactions, while in the presence of catalysts activated at 873 K, and characterised by strong acidic centres, both reactions occurred simultaneously.
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