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Textural changes during CO_2 activation of chars: A fractal approach

机译：焦炭CO_2活化过程中的纹理变化：分形方法

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摘要

In this paper two series of active carbons obtained at different flow rates of the activating agent, CO_2, are characterized in order to establish the different mechanisms of pore development during the activation step. This study complements previous works on textural development during the different steps in the process of obtaining active carbons: coal oxidation, coal pyrolysis and char gasification. As the characteristics of the original and intermediate materials are of capital importance in the pore development of active carbons, the properties of the active carbons, precursor chars and coals were considered and analyzed together. Mercury porosimetry and helium picnometry were used to determine classical textural parameters as well as to perform a more detailed study of the pore volume generation during the different conditions of the activation step. Data obtained from the mercury porosimetry determinations was also employed for fractal determinations according to the methodologies proposed by Friesen and Mikula, Zhang and Li and the procedure of Neimark. Average surface fractal dimensions as well as fractal profiles and local surface fractal dimensions were calculated. The use of different flow rates during the activation step produces changes not only in the ordinary textural parameters but also in the fractal characteristics of the active carbons. Activation at higher flow rates leads to smoother fractal profiles and also to lower values of the average surface fractal dimensions of the active carbons.
机译：在本文中，对两种在不同流速的活化剂CO_2下获得的活性炭进行了表征，以建立在活化步骤中孔发展的不同机理。这项研究补充了先前在获得活性炭过程中不同步骤：纹理的发展方面的工作：煤的氧化，煤的热解和炭化。由于原始和中间材料的特性对于活性炭的孔发展至关重要，因此，应一起考虑和分析活性炭，前驱体炭和煤的性能。汞孔隙率法和氦气皮重法用于确定经典的质地参数，以及对活化步骤不同条件下孔体积的产生进行更详细的研究。根据Friesen和Mikula，Zhang和Li提出的方法以及Neimark的方法，将从汞孔隙率测定法获得的数据也用于分形测定。计算平均表面分形维数以及分形轮廓和局部表面分形维数。在活化步骤中使用不同的流速不仅会改变普通的质地参数，还会改变活性炭的分形特征。在较高流速下的活化导致分形轮廓更平滑，并且活性炭的平均表面分形尺寸的值降低。

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