کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1637160 1516962 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Arrhenius parameters determination in non-isothermal conditions for mechanically activated Ag2O-graphite mixture
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Arrhenius parameters determination in non-isothermal conditions for mechanically activated Ag2O-graphite mixture
چکیده انگلیسی
The non-isothermal kinetics of mechanochemical reduction of Ag2O with graphite was studied by DSC and TGA with a model of fitting Malek approach and a model-free advanced isoconversional method of Vyazovkin. To evaluate the kinetics parameters, Ag2O-graphite mixture of as-received and milled for 2 and 4 h samples were selected. Based on the results obtained by Vyazovkin method calculation, however, the difference between the maximum and minimum values of activation energy is less than 20%-30% of the average activation energy ((99.38±2.36) kJ/mol) and thermal decomposition of mechanically activated Ag2O for 2 h is a multi-step process. Moreover, the thermal decomposition of mechanically activated Ag2O-graphite powder activated for 4 h is a single-step process (the average activation energy=(93.68±2.26) kJ/mol). The kinetics modeling shows that the complexity of thermal decomposition of as-received Ag2O-graphite mixture is higher than that of the others. While, the autocatalytic tendency of as-received Ag2O-graphite mixture is lower than that of the others.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Transactions of Nonferrous Metals Society of China - Volume 24, Issue 12, December 2014, Pages 3994-4003
نویسندگان
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