کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7062178 | 1459450 | 2016 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressure dependent kinetics of magnesium oxide carbothermal reduction
ترجمه فارسی عنوان
سینتیک وابسته به فشار از کاهش کاربوترمال اکسید منیزیم
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کلمات کلیدی
کاهش کربوترمال، اصطلاحا مدل رایگان سینتیک،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The rate of MgO carbothermal reduction was studied at temperatures from 1350 to 1650 °C and pressures from 0.1-100 kPa based on product gas analysis at near isothermal conditions. For all temperatures the initial rate of carbothermal reduction increased inversely with pressure, and between conversions of 20-35% a transition occurred after which the reaction rate was maximum at 10 kPa. Analysis of reacted pellets showed that the reaction stoichiometry, the ratio of C to MgO reacted, was less than unity and decreased with pressure indicating CO2 generation was more prevalent at elevated pressures. SEM imaging revealed the dissolution of C and MgO contact with conversion, and isoconversional analysis points to a change in the rate determining step between 1 and 10 kPa. The given experimental observations argue the importance of mass transfer and gaseous intermediates. A kinetic model is formulated based on a macroscopic species balance with CO2 as the reaction intermediate.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 636, 20 July 2016, Pages 23-32
Journal: Thermochimica Acta - Volume 636, 20 July 2016, Pages 23-32
نویسندگان
Boris A. Chubukov, Aaron W. Palumbo, Scott C. Rowe, Illias Hischier, Arto J. Groehn, Alan W. Weimer,