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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...
The effect of the coal carbonization step heating rate on the reactivity of the chars obtained, as well as on their porous structure development in the subsequent activation step, was analyzed. Different types of carbonization process were investigated, combining a low heating rate (5 K/min) and high heating rate (hundreds of K per second) in this step. Chars obtained in these processes were activated...
In this work, X-ray diffractograms of about 20 coal-based graphites and carbons, with different degrees of graphitic order, have been modeled using the recent computational model of Shi et al. This model relates the crystalline parameters c (= 2d 002 ) and a and the crystallite sizesL c and L a , to the parameters of the disorder present in carbons. These disorder...
Carbons were prepared by pyrolysing eight different coals from the Argonne Premium coal sample bank at temperatures near 1000°C. Electrochemical cells were made to study lithium insertion in these carbons. The electrochemical behavior and physical properties of these pyrolysed coals was compared to that of pyrolysed sugar, PVC and pitch which we have studied carefully before. Using powder X-ray...
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