کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6467425 1423257 2017 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New method of determination of intrinsic kinetic and mass transport parameters from typical catalyst activity tests: Problem of mass transfer resistance and diffusional limitation of reaction rate
ترجمه فارسی عنوان
روش جدید تعیین پارامترهای انتقال جنبشی ذاتی و جرم از آزمونهای فعالیت کاتالیستی: مساله مقاومت انتقال جمعی و محدودیت انتشاری سرعت واکنش
کلمات کلیدی
مدل سازی، موتورهای بیوگاز، راکتور ساختاری کاتالیزور اکسید فلزی، احتراق متان،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


- Numerical model separates intrinsic kinetic parameters from transport coefficients.
- Choice of the woven gauzes enhances heat and mass transfer parameters.
- The use of woven gauzes decreases the reactor length even 10 times.
- Palladium doped cobalt catalyst revealed great activity in methane combustion.

A question arises whether the kinetic parameters derived from the Arrhenius equation presented in the literature in fact reflect intrinsic kinetics or are influenced by diffusional effects. It is commonly accepted that diffusion can not only influence (reduce) the reaction rate but also change the observed kinetic constants and reaction order. In this study the limitation of reaction rate (n-hexane catalytic combustion) was observed even at moderate temperatures during experiments performed in a Continuous Stirred Tank Reactor (CSTR), gradientless reactor dedicated to determination of reaction kinetics. In this study a numerical method of the separation of intrinsic kinetics from mass transport effects has been proposed for an experiment executed under significant mass transfer resistance. It was tested using different carrier types (steel sheets and woven wire gauzes) and catalyst formulations for two combustion reactions: of n-hexane and methane. The intrinsic kinetic parameters derived in this way were then used for the numerical simulations of three types of structured reactors filled with: woven and knitted wire gauzes and monolith in terms of the optimization of a reactor length for combustion reactions. The performed simulations showed that the application of woven gauzes as the reactor internals can give rise to substantial decrease of the reactor length even by 10 times for both methane and n-hexane catalytic combustion reactions.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Science - Volume 162, 27 April 2017, Pages 322-331
نویسندگان
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