Ethylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalysts

Handle URI:
http://hdl.handle.net/10754/600104
Title:
Ethylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalysts
Authors:
Atanda, Luqman A.; Balasamy, Rabindran J.; Khurshid, Alam; Al-Ali, Ali A S; Sagata, Kunimasa; Asamoto, Makiko; Yahiro, Hidenori; Nomura, Kiyoshi; Sano, Tsuneji; Takehira, Katsuomi; Al-Khattaf, Sulaiman S.
Abstract:
A series of Mg3Fe0.5-xCoxAl0.5 (x = 0-0.5) catalysts were prepared from hydrotalcite precursors and their activities in the dehydrogenation of ethylbenzene were compared with those of a series of Mg3Fe0.5-yNiyAl0.5 (y = 0-0.5) catalysts also derived from hydrotalcite. The hydrotalcites prepared by co-precipitation were calcined at 550 °C to the mixed oxides with a high surface area of 150-240m2gcat-1; they were composed of Mg(Fe,Me,Al)O periclase and Mg(Me)(Fe,Al)2O4 spinel (Me = Co or Ni). Bimetallic Fe3+-Co2+ system showed a synergy, i.e., an increase in the activity, whereas Fe3+-Ni2+ bimetallic system showed no synergy. The high styrene yield was obtained on Mg 3Fe0.1Co0.4Al0.5; however, a large substitution of Fe3+ with Co2+ caused a decrease in styrene selectivity along with coking on the catalysts, due to an isolation of CoOx on the catalyst surface. The highest yield as well as the highest selectivity for styrene production was obtained at x = 0.25 at time on stream of 30 min. The coprecipitation at pH = 10.0 and the composition of Mg3Fe0.25Co0.25Al0.5 were the best for preparing the active catalyst. This is partly due to the formation of a good hydrotalcite structure. On this catalyst, the active Fe3+ species was reduced at a low temperature by the Fe3+-Co2+ bimetal formation, leading to a high activity. Simultaneously, the amount of reducible Fe3+ was the smallest, resulting in a high stability of the active Fe3+ species. It is likely that the dehydrogenation was catalyzed by the reduction-oxidation between Fe3+ and Fe2+ and that Co2+ assisted the reduction-oxidation by forming Fe 3+-Co2+ (1/1) bimetallic active species. © 2011 Elsevier B.V. All rights reserved.
Citation:
Atanda LA, Balasamy RJ, Khurshid A, Al-Ali AAS, Sagata K, et al. (2011) Ethylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalysts. Applied Catalysis A: General 396: 107–115. Available: http://dx.doi.org/10.1016/j.apcata.2011.02.003.
Publisher:
Elsevier BV
Journal:
Applied Catalysis A: General
Issue Date:
Apr-2011
DOI:
10.1016/j.apcata.2011.02.003
Type:
Article
ISSN:
0926-860X
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 Fahd University of Petroleum and Minerals (KFUPM) is also highly appreciated. The authors also acknowledge Japan Cooperation Center, Petroleum (JCCP) for giving opportunity of this collaborative research.
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DC FieldValue Language
dc.contributor.authorAtanda, Luqman A.en
dc.contributor.authorBalasamy, Rabindran J.en
dc.contributor.authorKhurshid, Alamen
dc.contributor.authorAl-Ali, Ali A Sen
dc.contributor.authorSagata, Kunimasaen
dc.contributor.authorAsamoto, Makikoen
dc.contributor.authorYahiro, Hidenorien
dc.contributor.authorNomura, Kiyoshien
dc.contributor.authorSano, Tsunejien
dc.contributor.authorTakehira, Katsuomien
dc.contributor.authorAl-Khattaf, Sulaiman S.en
dc.date.accessioned2016-02-28T07:58:56Zen
dc.date.available2016-02-28T07:58:56Zen
dc.date.issued2011-04en
dc.identifier.citationAtanda LA, Balasamy RJ, Khurshid A, Al-Ali AAS, Sagata K, et al. (2011) Ethylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalysts. Applied Catalysis A: General 396: 107–115. Available: http://dx.doi.org/10.1016/j.apcata.2011.02.003.en
dc.identifier.issn0926-860Xen
dc.identifier.doi10.1016/j.apcata.2011.02.003en
dc.identifier.urihttp://hdl.handle.net/10754/600104en
dc.description.abstractA series of Mg3Fe0.5-xCoxAl0.5 (x = 0-0.5) catalysts were prepared from hydrotalcite precursors and their activities in the dehydrogenation of ethylbenzene were compared with those of a series of Mg3Fe0.5-yNiyAl0.5 (y = 0-0.5) catalysts also derived from hydrotalcite. The hydrotalcites prepared by co-precipitation were calcined at 550 °C to the mixed oxides with a high surface area of 150-240m2gcat-1; they were composed of Mg(Fe,Me,Al)O periclase and Mg(Me)(Fe,Al)2O4 spinel (Me = Co or Ni). Bimetallic Fe3+-Co2+ system showed a synergy, i.e., an increase in the activity, whereas Fe3+-Ni2+ bimetallic system showed no synergy. The high styrene yield was obtained on Mg 3Fe0.1Co0.4Al0.5; however, a large substitution of Fe3+ with Co2+ caused a decrease in styrene selectivity along with coking on the catalysts, due to an isolation of CoOx on the catalyst surface. The highest yield as well as the highest selectivity for styrene production was obtained at x = 0.25 at time on stream of 30 min. The coprecipitation at pH = 10.0 and the composition of Mg3Fe0.25Co0.25Al0.5 were the best for preparing the active catalyst. This is partly due to the formation of a good hydrotalcite structure. On this catalyst, the active Fe3+ species was reduced at a low temperature by the Fe3+-Co2+ bimetal formation, leading to a high activity. Simultaneously, the amount of reducible Fe3+ was the smallest, resulting in a high stability of the active Fe3+ species. It is likely that the dehydrogenation was catalyzed by the reduction-oxidation between Fe3+ and Fe2+ and that Co2+ assisted the reduction-oxidation by forming Fe 3+-Co2+ (1/1) bimetallic active species. © 2011 Elsevier B.V. All rights reserved.en
dc.description.sponsorshipThis 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 Fahd University of Petroleum and Minerals (KFUPM) is also highly appreciated. The authors also acknowledge Japan Cooperation Center, Petroleum (JCCP) for giving opportunity of this collaborative research.en
dc.publisherElsevier BVen
dc.subjectEthylbenzene dehydrogenationen
dc.subjectFe3+-Co2+ active speciesen
dc.subjectHydrotalciteen
dc.subjectMg3Fe0.25Co 0.25Al0.5 catalysten
dc.subjectStyreneen
dc.titleEthylbenzene dehydrogenation over Mg3Fe0.5−xCoxAl0.5 catalysts derived from hydrotalcites: Comparison with Mg3Fe0.5−yNiyAl0.5 catalystsen
dc.typeArticleen
dc.identifier.journalApplied Catalysis A: Generalen
dc.contributor.institutionDepartment of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japanen
dc.contributor.institutionSchool of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japanen
dc.contributor.institutionDepartment of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Kagamiyama, 1-4-1, Higashi-Hiroshima 739-8527, Japanen
dc.contributor.institutionHiroshima University, Kagamiyama, 1-4-1, Higashi-Hiroshima, 739-8527, Japanen
kaust.authorAtanda, Luqman A.en
kaust.authorBalasamy, Rabindran J.en
kaust.authorKhurshid, Alamen
kaust.authorAl-Ali, Ali A.S.en
kaust.authorTakehira, Katsuomien
kaust.authorAl-Khattaf, Sulaiman S.en
kaust.grant.fundedcenterKAUST Center In Development at KFUPMen
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