Effect Of Pre-treatment Procedure On
Micropore System Characteristics Of
Subbituminous Coal
Author(s)
T. Zelenka
Abstract
Various pre-treatment procedures like hot oven drying under and without
vacuum, purging with an inert gas at elevated temperatures, lyophilisation and
long-term drying in a desiccator were applied on a sample of a subbituminous
coal. Variously dried samples with known residual moisture contents were
interpreted according to the microporous textural parameters. Adsorption
isotherms of CO2 at 30°C were determined using a volumetric sorption analyser.
Adsorption data were evaluated according to Dubinin–Radushkevich and
Medek’s equation in order to determine micropores’ volume and micropores’
surface and modus of the micropores’ radii.
It was found that the drying method has an influence on the microporous
textural properties. Samples which were not exposed to oxygen during drying
(vacuum drying, inert gas purging) have better micropore characteristics; likely
due to the lower contents of the residual moisture in the order of a few tenths
wt.%. If a sample is exposed to an oxidizing atmosphere at a comparable
temperature and drying time, the reduction of the textural parameters was
observed. It may be explained by a higher residual moisture content of this
sample (1.4 wt. %). The effect of the drying temperature has not been clearly
proven despite the fact that mean Smi and Vmi parameters have an increasing
tendency with a decreasing drying temperature. It was also found that 2 hours is
an effective time for the vacuum drying process at 60°C; even despite the
difference in residual moisture contents of these samples.
Keywords: subbituminous coal, pre-treatment procedure, surface area,
micropores.
Keywords
subbituminous coal, pre-treatment procedure, surface area,
micropores
Related Book
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