Development of macroporosity in activated carbons by effect of coal preoxidation and burn-off

被引：22

作者：

Pis, JJ ^{[1
]}

Parra, JB ^{[1
]}

de la Puente, G ^{[1
]}

Rubiera, F ^{[1
]}

Pajares, JA ^{[1
]}

机构：

[1] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain

来源：

FUEL | 1998年 / 77卷 / 06期

关键词：

semianthracite; activated carbons; mercury porosimetry; macroporosity;

D O I：

10.1016/S0016-2361(97)00156-7

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The effects of different treatments-preoxidation, pyrolysis and extent of burn-off-on the textural properties of activated carbons prepared from a semianthracite were studied. The materials obtained in the different steps were characterised by mercury porosimetry, nitrogen adsorption and scanning electron microscopy. Coal was preoxidised at 543 K for different periods of time up to 7 days. Carbonisation of fresh and oxidised coal samples was carried out under nitrogen at 1123 K at a heating rate of 60 K/min and a soaking time of 1 h. A significant development of macroporosity was obtained in the pyrolysis step, being more important in the case of the char produced from the unoxidised coal. Activation of the chars obtained after carbonisation of the oxidised coals was carried out by gasification in steam at 1123 K. Activation produced high macropore volumes mainly in the 800-2000 nm radius interval in the activated materials. The total pore volumes increased with burn-off, reaching values close to those of commercial activated carbons. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：625 / 630

页数：6

共 24 条

[1] INFLUENCE OF COAL OXIDATION ON THE STRUCTURE OF CHAR [J].