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0 1 Solid fuels (sources, winning, properties) 01 SOLID FUELS Sources, winning, properties
A small angle X-ray scattering study on the porosity of anthracites Cohaut, N. e! al. Carbon, 2000, 38, (9), 1391-1400. SAXS technique is applied on anthracites to study their heterogeneous microtexture and the mechanism of partial graphitization during a thermal treatment up to 2800°C. The effects of heat treatment on the porosity were observed at 1600°C and 2800°C and compared with homogeneous microtextures of mesoporous saccharose-based coke and lamellar anthracene-based coke. The main feature observed on raw anthracites, displaying the least degree of natural maturation and the largest isotropic distribution pf aromatic units, is the occurrence of a characteristic distance of 20 A. After a HTT of 1600°C the porosity of anthracites is close to lo-12%. carbon domains still being weakly organized, particularly on raw anthracites with the higher isotropic microtexture.
Discrepancies resulting from the graphitization degree reached at 2800°C were shown using the porosity and the mean length of chord in the matter. The porosity varies respectively from 19%, corresponding to a mean length chord of 97 A for least graphitized anthracites, to 10% and a mean length chord of 235 A for the most graphitized one.
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