Influence of anthracite pretreatment in the preparation of activated carbons

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• 作者：Daulan ; Christine ; Lyubchik ; Svetlana B. ; Rouzaud ; Jean-Noë ; l ; Bé ; guin ; Franç ; ois
• 关键词：activated carbon ; anthracite ; porosity ; HClO<sub>4sub> pretreatment ; surface area
• 刊名：Fuel
• 出版年：1998
• 出版时间：May, 1998
• 年：1998
• 卷：77
• 期：6
• 页码：495-502
• 全文大小：894 K

文摘

Chemical modification by HClO<sub>4sub> was used prior to physical gasification with CO<sub>2sub> to produce activated carbon from La Mure (France) anthracite. BET surface areas as high as 1600 m² g^&minus;1 and a total pore volume of 1 cm³ g^&minus;1 were obtained for this activated carbon. XPS studies have shown that a part of the chlorine had reacted with the anthracite, producing partial oxidation at low temperature. Contrary to all expectations, SEM images confirmed no exfoliation after thermal shock. The main effect of the chemical pretreatment is to reduce the time of physical activation. This reduction can be attributed to the creation of numerous channels in the anthracite macrotexture during chemical pretreatment and thermal shock. The accessibility of the inner surface of the anthracite to CO<sub>2sub> was increased, and was responsible for deep gasification of the anthracite. Finally, physical activation after chemical pretreatment led mainly to a microporous carbon with a significant amount of mesoporosity.