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مقاله Kinetic modeling and prediction of the deactivation mechanism in zeoliteدرcatalyzed alkylation of isobutane with 2درbutene word دارای 5 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

فایل ورد مقاله Kinetic modeling and prediction of the deactivation mechanism in zeoliteدرcatalyzed alkylation of isobutane with 2درbutene word کاملا فرمت بندی و تنظیم شده در استاندارد دانشگاه و مراکز دولتی می باشد.

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توجه : در صورت  مشاهده  بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی مقاله Kinetic modeling and prediction of the deactivation mechanism in zeoliteدرcatalyzed alkylation of isobutane with 2درbutene word ،به هیچ وجه بهم ریختگی وجود ندارد

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بخشی از متن مقاله Kinetic modeling and prediction of the deactivation mechanism in zeoliteدرcatalyzed alkylation of isobutane with 2درbutene word :

سال انتشار: 1388

محل انتشار: ششمین کنگره بین المللی مهندسی شیمی

تعداد صفحات: 5

چکیده:

In the present work, the kinetic modeling of the liquid phase alkylation of isobutane with 2-butene over a faujasite (FAU) zeolite was performed. Since under liquid phase conditions the alkylation reaction is severely diffusion limited, effects of diffusion on the rate of reaction and deactivation pathways were considered. By implementing morem appropriate assumptions in comparison with previous investigations, an attempt was made in order to properly model the catalyst deactivation in a mixed reactor. Accordingly, spatial variation of diffusivity in the pores of the catalyst wasconsidered as a function of time on stream. The obtained profiles of intrapellet butene concentration and point activity implied that at later stages of conversion drop, a transition from individual site poisoning into pore mouth plugging mechanism might occur. It was also found that the assumption of the shell progressive mechanism was not valid during the earlier stages of the deactivation. Furthermore, the values of the reactioand deactivation rate constants, as well as the diffusivity in the poisoned region of the pores were determined through fitting and sensitivity analysis of theestimated parameters were performed. Results revealed that the diffusivity in the poisoned region of the pores had a pronounced effect on the deactivation behavior of the catalyst.

 

 

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