Synthesis of a high-yield activated carbon by air gasification of macadamia nut shell charcoal

被引:28
作者
Dai, XF
Antal, MJ [1 ]
机构
[1] Univ Hawaii, Hawaii Nat Energy Inst, Honolulu, HI 96822 USA
[2] Univ Hawaii, Dept Mech Engn, Honolulu, HI 96822 USA
关键词
D O I
10.1021/ie990063u
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Macadamia nut shell charcoal was heated in an inert environment to temperatures above 1000 K ("carbonized"), reacted with oxygen (P-O2 = 2.68-11.3 kPa) at temperatures between 525 and 586 K ("oxygenated"), and heated again in an inert environment to temperatures above 1000 K ("activated") to produce an activated carbon, Carbons produced by this process possess surface areas and iodine numbers in the range of 400-550. Overall yields of these carbons (based on the dry, raw macadamia nut shell feed) ranged from 24 to 30 wt %. Under the conditions employed in this work, the rates of chemisorption and gasification were not mass transfer limited. Initially, the gasification reaction was first-order with respect to oxygen concentration but became independent of oxygen concentration as the surface sites of the carbon became saturated with oxygen.
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页码:3386 / 3395
页数:10
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