The preparation of active carbons from coal by chemical and physical activation
The preparation of active carbons from coal by chemical and physical activation
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DOI：
10.1016/0008-6223(95)00204-9
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发表时间：
1996-01-01
期刊：
影响因子：
10.9
通讯作者：
Do, DD
中科院分区：
文献类型：
--
作者：
Ahmadpour, A;Do, DD
以烟煤为原料，采用氢氧化钾和氯化锌为活化剂，采用化学活化法和二氧化碳为活化剂，制备了一系列活性炭。研究了炭化时间、炭化温度、颗粒尺寸、化学试剂、混合方式和浸渍比等工艺参数对化学活化过程的影响，以优化制备工艺参数。通过氯化锌在CO2中活化获得的高表面积碳的部分气化具有不同的暴露时间，显示出吸附的一些改善。还将化学活性炭的物理性质与纯通过物理活化获得的那些进行了比较。在煤的化学活化与这两种化学剂的最重要的参数被发现是浸渍比。碳化温度是另一个对孔隙体积演化有很大影响的变量。提高碳化温度可以提高KOH-活性炭的比表面积和孔体积，但会破坏ZnCl 2碳系中的碳结构。在实验条件下，确定了KOH和ZnCl 2活化制备高比表面积炭的最佳条件。版权所有（C）1996 Elsevier Science Ltd
A series of activated carbons was prepared from bituminous coal by chemical activation with potassium hydroxide and zinc chloride and also by physical activation with carbon dioxide. The effect of process variables such as carbonization time, temperature, particle size, chemical agents, method of mixing and impregnation ratio in the chemical activation process was studied in order to optimize those preparation parameters. Partial gasification of the high surface area carbon obtained by zinc chloride activation in CO2 with different exposure times shows some improvement in adsorption. The physical properties of the chemically activated carbon was also compared with those obtained purely by physical activation. The most important parameter in chemical activation of coal with both of the chemical agents was found to be impregnation ratio. Carbonization temperature is another variable which had a high effect on pore volume evolution. While increasing the carbonization temperature enhances surface area and pore volumes of KOH-activated carbon, it destroys carbon structure in the ZnCl2 carbon series. Under the experimental conditions investigated, the optimum conditions for high surface area carbons with KOH and ZnCl2 activation are identified. Copyright (C) 1996 Elsevier Science Ltd