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A simple kinetic analysis to determine the intrinsic reactivity of coal chars

机译：简单的动力学分析，确定煤焦的内在反应性

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摘要

The intrinsic oxidation reactivity in air of an activated carbon char derived from bituminous coal was investigated using a new thermogravimetric analysis (TGA) method. Applying the new method, values of the Arrhenius activation energy E and pre-exponential factor A were estimated from TGA data obtained via heating samples at different constant rates. A novel statistical criterion was subsequently used to determine the heating rate at which optimum values of E and A were obtained. This is a valuable development, for in conventional non-isothermal TGA, while it is accepted that Arrhenius parameters vary with heating rate, there is no formal method for selecting one rate (and hence one set of values of E and A) over another. Using this new method, the following optimum values were obtained for the carbon at a heating rate of 25℃ min~(-1): E= 129.4 kJ mol~(-1) and ln(A/s~(-1)) = 10.4. These results are very similar to those calculated for the same material using more time consuming and less accurate isothermal TGA methods. It is therefore proposed that this new analysis method might be an improvement on conventional techniques to determine the intrinsic oxidation reactivity in air of coal chars.
机译：使用新的热重分析（TGA）方法研究了烟煤制得的活性炭在空气中的固有氧化反应性。应用该新方法，通过加热样品以不同的恒定速率从TGA数据中估算出Arrhenius活化能E和指数前因子A的值。随后使用一种新颖的统计标准来确定加热速率，在该速率下可获得最佳的E和A值。对于常规的非等温TGA，这是一个有价值的发展，尽管人们公认Arrhenius参数会随加热速率而变化，但尚无正式的方法来选择一种速率（以及一组E和A值）。使用该新方法，在25℃min〜（-1）的加热速率下，碳的最佳值如下：E = 129.4 kJ mol〜（-1）和ln（A / s〜（-1）） = 10.4。这些结果与使用更多时间，更不准确的等温TGA方法对相同材料计算得到的结果非常相似。因此，建议这种新的分析方法可能是对确定煤焦在空气中固有氧化反应性的常规技术的改进。

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