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    Transalkylation of ethyl benzene with triethylbenzene over ZSM-5 zeolite catalyst

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    Type
    Article
    Authors
    Akhtar, Naseem
    Tukur, Nasiru M.
    Al-Yassir, Nabil
    Al-Khattaf, Sulaiman
    Čejka, Jiří
    KAUST Department
    Secondary School
    Date
    2010-09
    Permanent link to this record
    http://hdl.handle.net/10754/600110
    
    Metadata
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    Abstract
    Transalkylation of 1,3,5-triethylbenzene (TEB) with ethylbenzene (EB) has been studied over ZSM-5 zeolite using a riser simulator reactor with respect to optimizing DEB yield. The reaction temperature was varied from 350 to 500°C with contact time ranging from 3 to 15s to report on the effect of reaction conditions on TEB conversion, DEB selectivity and isomerization of TEB. The transalkylation of TEB with EB was compared with the reactions of pure 1,3,5-TEB and EB (disproportionation, isomerization and cracking). A synergistic effect was observed on the conversion of 1,3,5-TEB and DEB yield. The 1,3,5-TEB conversion increased from 40% to 50% with simultaneous increase in the DEB selectivity from 17% to 36% in transalkylation reaction (EB+1,3,5-TEB) as compared with the reaction of pure 1,3,5-TEB. It was found that pure 1,3,5-TEB underwent cracking reaction to produce DEB and EB. The isomerization of 1,3,5-TEB was more active at low temperature while cracking was more active at high temperature. The temperature of 350°C was observed as the optimum for production of maximum amount of DEB. Kinetic parameters for the disappearance of 1,3,5-TEB during its transformation reaction via cracking and isomerization pathways were calculated using the catalyst activity decay function based on time-on-stream (TOS). The apparent activation energies decrease in order E secondary cracking>E primary racking>E isomerization for ZSM-5 catalysts. © 2010 Elsevier B.V.
    Citation
    Akhtar MN, Tukur NM, Al-Yassir N, Al-Khattaf S, Čejka J (2010) Transalkylation of ethyl benzene with triethylbenzene over ZSM-5 zeolite catalyst. Chemical Engineering Journal 163: 98–107. Available: http://dx.doi.org/10.1016/j.cej.2010.07.026.
    Sponsors
    We would like to express our appreciations for King Abdullah University of Science and Technology (KAUST) for their financial support. The support of King Fahd University of Petroleum and Minerals (KFUPM) is also highly appreciated.
    Publisher
    Elsevier BV
    Journal
    Chemical Engineering Journal
    DOI
    10.1016/j.cej.2010.07.026
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.cej.2010.07.026
    Scopus Count
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