Activated carbon production from low ash subbituminous coal with CO₂ activation

Agricultural Waste Conversion to Activated Carbon by Chemical Activation with Phosphoric Acid

“…4-7. The data in Tabs. [4][5][6][7] indicates that the iodine number of prepared activated carbon was substantially influenced by the phosphoric acid concentration in the impregnating solution, whereas the carbon yield did not change greatly. According to these data, the iodine number of activated carbon from bagasse increased from 365 to 790 mg I 2 /g carbon with an increase of impregnation ratio from 10 % to 100 %, the iodine Table 3.…”

“…The advantages of the chemical activation method can be summarized as follows: -It uses lower temperatures for pyrolysis; -Usually, it can be performed in one step; -It produces a much higher yield than physical activation; -Very high surface area activated carbons can be obtained; -If desired, microporosity can be well developed, controlled and maintained in a narrow range; -There is an important reduction of the mineral matter content. The literature also mentions some disadvantages of the chemical activation process, such as the corrosiveness of the process and the washing stage [5].…”

Effect of Raw Materials on Properties of Activated Carbons

“…-There is an important reduction of the mineral matter content. The literature also reports some disadvantages of the chemical activation process, such as the corrosiveness of the process and the washing stage [6].…”

Preparation of activated carbons from Zonguldak region coals by physical and chemical activations for hydrogen sorption

“…These chemical reagents may promote the constitution of cross-links, leading to the constitution of rigid matrix, less prone to volatile loss and volume contraction upon heating to high temperatures [1,[15][16][17]. The physical activation process consists of a preliminary thermal treatment of the carbonaceous precursor in an inert environment, called pyrolysis followed by suitable activation of the resulting char using steam or carbon dioxide [18][19][20]. It was reported in literature that air is not widespread used as oxidant, although lower activation temperatures could be used, as carbon-oxygen reactions are exothermic and can result in thermal runaway and extreme burn off [21].…”