Ethylbenzene dehydrogenation over binary FeOx–MeOy/Mg(Al)O catalysts derived from hydrotalcites
Type
ArticleAuthors
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-C1-019-12Date
2010-12-20Permanent link to this record
http://hdl.handle.net/10754/600102
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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 researchPublisher
Elsevier BVJournal
Applied Catalysis A: Generalae974a485f413a2113503eed53cd6c53
10.1016/j.apcata.2010.10.017