Influence of thermal treatment regime on the density and reactivity of activated carbons from almond shells

被引:71
作者
Marcilla, A [1 ]
García-García, S [1 ]
Asensio, M [1 ]
Conesa, JA [1 ]
机构
[1] Univ Alicante, Dept Chem Engn, E-03080 Alicante, Spain
关键词
char; heat treatment; mechanical properties; reactivity;
D O I
10.1016/S0008-6223(99)00123-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A study of the influence of two successive thermal treatments, at low (3-4 degrees C min(-1)) and (ca. 3000 degrees C min(-1)) heating rate, on the properties and reactivity of chars obtained from almond shells was carried out. The combined thermal treatment consisted of a first stage at intermediate temperatures from 275 to 400 degrees C at the low heating rate, followed by a second stage at the high rate, up to 850 degrees C. All the samples obtained under these conditions (except the sample obtained at an intermediate temperature of 400 degrees C) yielded a density much lower than that corresponding to a single thermal treatment up to 850 degrees C at both heating rates. The sample obtained at 400 degrees C behaved in a very interesting manner since its density was the highest obtained. A correlation has been obtained between the high reactivity of the samples obtained by a single treatment at high heating rare, and the Ca content and dispersion. The adsorption properties of the activated carbons obtained at approximately 50% burn-off were very similar regardless of the reactivity and the porous structure of the precursor chars. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:429 / 440
页数:12
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