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Adsorption properties and porous structure within granules of activated carbons with different burn-off

机译：不同燃尽度的活性炭颗粒内的吸附性能和多孔结构

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摘要

Two activated carbons of AG type obtained by activation with the steam of carbonised granules prepared from hard coal and tar were examined. One of them has a lower (41/100) and the other a higher (54/100) level of burn-off. The quantitative evaluation of radial differentiation of porous structure has been made on the basis of analysis of samples obtained by gradual removal of the outer layer of activated carbon granules using the attrition process in the spouted bed. The abrasion treatment was carried out in two steps: elimination of about 33 and 66/100 of the total granule weight. The benzene vapour adsorption--desorption isotherms and ash contents were determined fOr all samples obtained from both source carbons. The evaluation of micropore structure parameters on the basis of benzene vapour adsorption isotherms was done using the adsorption equations proposed by Dubinin--Radushkevich, Dubinin--Stoeckli and Horvath--Kawazoe. The fractal analysis and changes of surface roughness as a function of granule radius was performed for all samples. The comparison of the porous structure and fractal dimensions of corresponding samples of activated carbons with different levels of activation was done.
机译：考察了由硬煤和焦油制得的碳化颗粒的蒸汽活化得到的两种AG型活性炭。其中之一的燃尽程度较低（41/100），而另一种的燃尽程度较高（54/100）。在对样品进行分析的基础上，对多孔结构的径向微分进行了定量评估，该样品是通过在流化床中采用磨损工艺逐步去除活性炭颗粒外层而获得的。研磨处理分两个步骤进行：消除总颗粒重量的约33和66/100。确定了从两种来源碳中获得的所有样品的苯蒸气吸附-解吸等温线和灰分。基于Dubinin-Radushkevich，Dubinin-Stoeckli和Horvath-Kawazoe提出的吸附方程，基于苯蒸气吸附等温线对微孔结构参数进行了评估。对所有样品进行分形分析和表面粗糙度随颗粒半径的变化。比较了具有不同活化水平的相应活性炭样品的多孔结构和分形维数。

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