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Indexed by:期刊论文

Date of Publication:2013-05-01

Journal:JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL

Included Journals:SCIE、EI

Volume:371

Page Number:36-41

ISSN No.:1381-1169

Key Words:Ethylbenzene dehydrogenation; Spinel; Fe-57 Mossbauer spectroscopy; Synergy

Abstract:Fe-doped MgAl2O4 spinet catalyst of MgFe0.1Al1.9O4 and supported catalyst of Fe2O3-MgO/gamma-Al2O3 for ethylbenzene dehydrogenation in the presence of CO2 were studied by Mossbauer spectroscopy (MS) combining with the partial reduction method in the presence of H-2, and the catalytic activity of the ferrous iron species was discussed. The results showed that the catalytic performance of Fe3+ existing in spinel is superior to alpha-Fe2O3, and the synergistic effect between Fe2+ and Fe3+ might indeed increase the catalytic activity since Fe2+-O2- formed in the process of reduction has moderate basicity, which was more favorable for desorption of CO2 compared with Mg2+-O2-. The reduced MgFe0.1Al1.9O4 containing Fe2+ of around 25% exhibits much higher catalytic activity than unreduced catalyst, with improved styrene yield nearly 2 times to 45.0%. MgxFe1-xO as another ferrous iron species formed in the reduction process of Fe2O3-MgO/gamma-Al2O3 showed inconspicuously catalytic activity. (C) 2013 Elsevier B.V. All rights reserved.