Effect of pre-carbonization of petroleum cokes on chemical activation process with KOH
Effect of pre-carbonization of petroleum cokes on chemical activation process with KOH
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DOI：
10.1016/j.carbon.2005.04.009
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发表时间：
2005-09-01
期刊：
影响因子：
10.9
通讯作者：
Liu, CH
中科院分区：
文献类型：
--
作者：
Lu, CL;Xu, SP;Liu, CH
采用TG-DTG、FTIR、XRD、BET等技术研究了石油焦预炭化对活性炭前驱体和KOH活化炭性能的影响。TG-DTG研究表明，挥发性物种的分解和FTIR分析确定的C-O，C-O-C，C-O-H和一些烷基物种的存在的前体表面。XRD结果表明，在500 ℃炭化后，样品的结构发生了无序化，随着炭化温度的升高，样品的结构逐渐有序化。随着预炭化温度的升高，前驱体的BET比表面积和N2吸附量降低，同时前驱体表面的功能物种减少。这些表面功能物种被提出在KOH活化过程中的孔隙率发展中发挥关键作用。首先，它们与KOH反应形成中间产物C-O-K物种，然后产物进一步与前驱体中的碳反应，最后形成多孔结构。因此，活性炭的表面积和孔径分布可以通过优化预碳化和活化过程的条件来控制。(C)2005爱思唯尔有限公司保留所有权利。
The influence of pre-carbonization of petroleum cokes on the properties of the activated carbon precursors and final carbons activated with KOH was investigated by using TG-DTG, FTIR, XRD, and BET techniques. TG-DTG study revealed the decomposition of volatile species and FTIR analysis identified the presence of C-O, C-O-C, C-O-H and some alkyl species on the surface of the precursors. XRD results indicated that a disorder occurred after the carbonization at 500 degrees C and an order happened gradually with increasing the temperature. The decreases in the BET surface area and N-2 adsorption capacity coincided with the reduction of the functional species on the precursor surface with the increase of the pre-carbonization temperature. These surface functional species were proposed to play a key role in the porosity development during the KOH activation. First, they reacted with KOH to form the intermediate C-O-K species, then the resultants further reacted with the carbon of the precursor, and finally developed the porous structure. As a result, the surface area and the pore size distribution of the activated carbon can be controlled by optimizing the conditions of the pre-carbonization and activation processes. (C) 2005 Elsevier Ltd. All rights reserved.