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    Ethylbenzene dehydrogenation over binary FeOx–MeOy/Mg(Al)O catalysts derived from hydrotalcites

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    Type
    Article
    Authors
    Balasamy, Rabindran J.
    Khurshid, Alam
    Al-Ali, Ali A S
    Atanda, Luqman A.
    Sagata, Kunimasa
    Asamoto, Makiko
    Yahiro, Hidenori
    Nomura, Kiyoshi
    Sano, Tsuneji
    Takehira, Katsuomi
    Al-Khattaf, Sulaiman S.
    KAUST Grant Number
    K-C1-019-12
    Date
    2010-12-20
    Permanent link to this record
    http://hdl.handle.net/10754/600102
    
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    Abstract
    A series of FeOx-MeOy/Mg(Al)O catalysts were prepared from hydrotalcite-like compounds as precursors and were tested in the ethylbenzene dehydrogenation to styrene in He atmosphere at 550 °C. The hydrotalcite-like precursors of the metal compositions of Mg3Fe 0.25Me0.25Al0.5 (Me = Cu, Zn, Cr, Mn, Fe, Co and Ni) were coprecipitated from the nitrates of metal components and calcined to mixed oxides at 550 °C. After the calcination, the mixed oxides showed high surface area of 150-200 m2 gcat -1, and were mainly composed of (MgMe)(Fe3+Al)O periclase in the bulk, whereas the surface was enriched by (MgMe)(Fe3+Al)2O 4 pinel. Among the Me species tested, Co2+ was the most effective, followed by Ni2+. Co2+ addition increased the activity of original FeOx/Mg(Al)O catalyst, whereas Ni2+ increased the activity at the beginning of reaction, but deactivated the catalyst during the reaction. The other metals formed isolated MeOx species in the catalyst, resulting in a decrease in the activity compared to the original FeOx/Mg(Al)O catalyst. The active Fe species exists as metastable Fe3+ on the FeOx/Mg(Al)O catalyst. By the addition of Co2+, the reduction-oxidation between Fe3+ and Fe2+ was facilitated and, moreover, the active Fe3+ species was stabilized. It is likely that the dehydrogenation proceeds on the active Fe3+ species via its reduction-oxidation assisted by Co 2+. © 2010 Elsevier B.V.
    Citation
    Balasamy RJ, Khurshid A, Al-Ali AAS, Atanda LA, Sagata K, et al. (2010) Ethylbenzene dehydrogenation over binary FeOx–MeOy/Mg(Al)O catalysts derived from hydrotalcites. Applied Catalysis A: General 390: 225–234. Available: http://dx.doi.org/10.1016/j.apcata.2010.10.017.
    Sponsors
    This publication was based on work supported by Award No K-C1-019-12 made by King Abdullah University of Science and Technology (KAUST) The support of King Fand University of Petroleum and Minerals (KFUPM) is also highly appreciated The authors also acknowledge Japan Cooperation Center Petroleum (JCCP) to give the opportunity of this collaborative research
    Publisher
    Elsevier BV
    Journal
    Applied Catalysis A: General
    DOI
    10.1016/j.apcata.2010.10.017
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.apcata.2010.10.017
    Scopus Count
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