Pore structure and adsorption characteristics of steam pyrolysis carbons from Moringa oleifera

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• 作者：Warhurst ; A. M. ; Fowler ; G. D. ; McConnachie ; G. L. ; Pollard ; S.J.T.
• 关键词：A. Activated carbon ; B. pyrolysis ; C. adsorption ; D. porosity
• 刊名：Carbon
• 出版年：1997
• 期刊代码：10_00086223
• 类别：ms
• 出版时间：1997
• 卷：35
• 期：8
• 页码：1039-1045
• 文件大小：793 K

摘要

A series of activated carbons has been prepared from the waste seed husks of the tropical multi-purpose tree Moringa oleifera, using a single-stage steam pyrolysis activation. Carbons were characterised by N<sub>2sub> adsorption, CHN analysis and scanning electron microscopy. Nitrogen adsorption isotherms were analysed by the BET, t-plot and Horváth and Kawazoe methods. All the carbons were microporous, with those activated at 750°C for 120 minutes () and 800°C for 30 or 60 minutes having the highest BET surface areas, of 730, 713 and 774 m² g^&minus;1, respectively. A simple acid rinse of the 800°C/30 minutes carbon increased the surface area to 932 m² g^&minus;1. The carbon had the highest mesopore and macropore surface area, 135.7 m² g^&minus;1, compared to 92.7 m² g^&minus;1 for the carbon. Scanning electron micrographs of the carbon showed a lignocellulosic macropore structure, cleaned by the steam pyrolysis.