کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
675613 | 1459609 | 2008 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A study on isothermal kinetics of thermal decomposition of cobalt oxalate to cobalt
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A study on isothermal kinetics of thermal decomposition of cobalt oxalate to cobalt A study on isothermal kinetics of thermal decomposition of cobalt oxalate to cobalt](/preview/png/675613.png)
چکیده انگلیسی
Thermal decomposition of cobalt oxalate (CoC2O4·2H2O) was studied using TG, DTA and XRD techniques. Non-isothermal studies revealed that the decomposition occurred in two main stages: removal of water and next decomposition of CoC2O4 to Co. Isothermal kinetic studies were conducted for the second stage of decomposition at six different temperatures between 295 and 370 °C in reducing (He + 15 vol% H2) atmosphere. Kinetic equation was found to obey g(α) = [âln(1 â α)]1/n = kt relationship with varying values of n between 2 and 4. The variation of activation energy between 73.23 and 119 kJ molâ1 from the lowest to the highest temperature of decomposition indicated the multi-step nature of the process. SEM analysis revealed the formation of nano-size powder in this temperature range. Thermal decomposition at 550 °C for 30 min was found to be optimum condition producing fine size, non-pyrophoric and spherical powder in larger scale of production. Both hcp and fcc phases were present in the cobalt powder at room temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 473, Issues 1â2, 10 July 2008, Pages 45-49
Journal: Thermochimica Acta - Volume 473, Issues 1â2, 10 July 2008, Pages 45-49
نویسندگان
S. Majumdar, I.G. Sharma, A.C. Bidaye, A.K. Suri,