Kinetics modeling of ethylbenzene dehydrogenation to styrene over a mesoporous alumina supported iron catalyst

Handle URI:
http://hdl.handle.net/10754/600108
Title:
Kinetics modeling of ethylbenzene dehydrogenation to styrene over a mesoporous alumina supported iron catalyst
Authors:
Hossain, Mohammad M.; Atanda, Luqman; Al-Yassir, Nabil; Al-Khattaf, Sulaiman
Abstract:
The kinetics of ethylbenzene (EB) dehydrogenation over a FeO x-meso-Al 2O 3 catalyst is studied. The models were developed based on physicochemical characterization and a CREC fluidized Riser Simulator data. N 2 adsorption shows that the synthesized FeO x-meso-Al 2O 3 catalyst is mesoporous with pore size between 9 and 35nm. TPR profile indicates that iron on meso-Al 2O 3 forms easily reducible nanostructured crystals which is confirmed by TEM image. NH 3- and CO-TPD analysis, respectively reveals the availability of both acidic and basic sites. The dehydrogenation of ethylbenzene on FeO x-meso-Al 2O 3 catalyst mainly gives styrene (∼99%) while a small amount of benzene, toluene and coke are also detected. Based on the experimental observations two Langmuir-Hinshelwood type kinetics models are formulated. The possible catalyst deactivation is expressed as function of EB conversion. Parameters are estimated by fitting of the experimental data implemented in MATLAB. Results show that one type site Langmuir-Hinshelwood model appropriately describes the experimental data, with adequate statistical fitting indicators and also satisfied the physical constraints. The activation energy for the formation of styrene (80kJ/mol) found to be significantly lower than that of the undesired products benzene (144kJ/mol) and toluene (164kJ/mol). The estimated heat of adsorptions of EB and ST are found to be 55kJ/mol and 19kJ/mol, respectively. © 2012 Elsevier B.V.
Citation:
Hossain MM, Atanda L, Al-Yassir N, Al-Khattaf S (2012) Kinetics modeling of ethylbenzene dehydrogenation to styrene over a mesoporous alumina supported iron catalyst. Chemical Engineering Journal 207-208: 308–321. Available: http://dx.doi.org/10.1016/j.cej.2012.06.108.
Publisher:
Elsevier BV
Journal:
Chemical Engineering Journal
Issue Date:
Oct-2012
DOI:
10.1016/j.cej.2012.06.108
Type:
Article
ISSN:
1385-8947
Appears in Collections:
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DC FieldValue Language
dc.contributor.authorHossain, Mohammad M.en
dc.contributor.authorAtanda, Luqmanen
dc.contributor.authorAl-Yassir, Nabilen
dc.contributor.authorAl-Khattaf, Sulaimanen
dc.date.accessioned2016-02-28T07:59:01Zen
dc.date.available2016-02-28T07:59:01Zen
dc.date.issued2012-10en
dc.identifier.citationHossain MM, Atanda L, Al-Yassir N, Al-Khattaf S (2012) Kinetics modeling of ethylbenzene dehydrogenation to styrene over a mesoporous alumina supported iron catalyst. Chemical Engineering Journal 207-208: 308–321. Available: http://dx.doi.org/10.1016/j.cej.2012.06.108.en
dc.identifier.issn1385-8947en
dc.identifier.doi10.1016/j.cej.2012.06.108en
dc.identifier.urihttp://hdl.handle.net/10754/600108en
dc.description.abstractThe kinetics of ethylbenzene (EB) dehydrogenation over a FeO x-meso-Al 2O 3 catalyst is studied. The models were developed based on physicochemical characterization and a CREC fluidized Riser Simulator data. N 2 adsorption shows that the synthesized FeO x-meso-Al 2O 3 catalyst is mesoporous with pore size between 9 and 35nm. TPR profile indicates that iron on meso-Al 2O 3 forms easily reducible nanostructured crystals which is confirmed by TEM image. NH 3- and CO-TPD analysis, respectively reveals the availability of both acidic and basic sites. The dehydrogenation of ethylbenzene on FeO x-meso-Al 2O 3 catalyst mainly gives styrene (∼99%) while a small amount of benzene, toluene and coke are also detected. Based on the experimental observations two Langmuir-Hinshelwood type kinetics models are formulated. The possible catalyst deactivation is expressed as function of EB conversion. Parameters are estimated by fitting of the experimental data implemented in MATLAB. Results show that one type site Langmuir-Hinshelwood model appropriately describes the experimental data, with adequate statistical fitting indicators and also satisfied the physical constraints. The activation energy for the formation of styrene (80kJ/mol) found to be significantly lower than that of the undesired products benzene (144kJ/mol) and toluene (164kJ/mol). The estimated heat of adsorptions of EB and ST are found to be 55kJ/mol and 19kJ/mol, respectively. © 2012 Elsevier B.V.en
dc.publisherElsevier BVen
dc.subjectCatalyst deactivation modelen
dc.subjectDehydrogenation of ethylbenzeneen
dc.subjectLangmuir-Hinshelwood modelen
dc.subjectMeso-aluminaen
dc.subjectStyreneen
dc.subjectSupported iron catalysten
dc.titleKinetics modeling of ethylbenzene dehydrogenation to styrene over a mesoporous alumina supported iron catalysten
dc.typeArticleen
dc.identifier.journalChemical Engineering Journalen
dc.contributor.institutionDepartment of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabiaen
kaust.authorHossain, Mohammad M.en
kaust.authorAtanda, Luqmanen
kaust.authorAl-Yassir, Nabilen
kaust.authorAl-Khattaf, Sulaimanen
kaust.grant.fundedcenterKAUST Center In Development at KFUPMen
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