Activation of coal tar pitch carbon fibres:: Physical activation vs. chemical activation
Activation of coal tar pitch carbon fibres:: Physical activation vs. chemical activation
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DOI：
10.1016/j.carbon.2004.01.013
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发表时间：
2004-01-01
期刊：
影响因子：
10.9
通讯作者：
Linares-Solano, A
中科院分区：
文献类型：
--
作者：
Maciá-Agulló, JA;Moore, BC;Linares-Solano, A
活性炭纤维（ACF）主要通过蒸汽或二氧化碳的物理活化而获得。此外，有许多论文涉及使用多种化学试剂（例如磷酸、氯化锌、氯化铝等）对碳纤维或聚合物原材料进行化学活化。尽管如此，尽管众所周知氢氧化物是良好的活化剂，但关于用 KOH 或 NaOH 活化碳纤维的论文却很少。在目前的工作中，通过用 KOH 和 NaOH 进行化学活化获得了高表面积的 ACF。两种化学试剂表现出不同的行为；因此，NaOH 产生了最高的孔隙率值，而 KOH 则产生了具有较窄微孔尺寸分布的样品。为了将结果与物理活化获得的结果进行比较，使用 CO2 活化制备了一些 ACF。这项工作的主要结论是，通过使用化学活化可以获得与物理活化相似甚至更高的孔隙率（类似于1 ml/g，类似于3000 m(2)/g）。然而，化学活化具有两个重要优点：(1) 产率高得多（对于类似于 2500 m(2)/g 的活性碳纤维，化学活化为 27-47%，物理活化为 6%）；(2) 通过化学活化制备的纤维表面比通过物理活化制备的纤维表面损伤更小。 (C) 2004 Elsevier Ltd. 保留所有权利。
Activated carbon fibres (ACF) are obtained mainly by physical activation with steam or carbon dioxide. Additionally, there are many papers dealing with chemical activation of carbon fibres, or a polymeric raw material, with several chemical agents like for example, phosphoric acid, zinc chloride, aluminium chloride,... Nevertheless, although it is well known that hydroxides are good activating agents, there are few papers about the activation of carbon fibres with KOH or NaOH. In the present work, ACF with high surface area are obtained by chemical activation with KOH and NaOH. Both chemical agents present different behaviour; thus, NaOH developed the highest value of porosity and KOH developed samples with narrower micropore size distribution. In order to compare the results with those obtained by physical activation, some ACF have been prepared using CO2 activation. The main conclusion of this work is that by using chemical activation it is possible to obtain similar, or even higher, porosity (similar to1 ml/g, similar to3000 m(2)/g) than by physical activation. However, chemical activation presents two important advantages: (1) a much higher yield (27-47% for chemical activation and 6% physical activation for similar to2500 m(2)/g activated carbon fibres) and (2) the surface of the fibres prepared by chemical activation is less damaged than by physical activation. (C) 2004 Elsevier Ltd. All rights reserved.