ISSN:
1600-5767
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Geosciences
,
Physics
Notes:
Small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) have been used to study the microporosity and micromineralogy of vitrinite in a high-volatile bituminous coal (Illinois No. 6). Sections were selected from samples that contained representative amounts of vitrinite. Micropores and fine minerals with sizes ranging between 10 and 1000 Å were observed. The minerals, primarily silicates, were heterogeneously distributed in layers parallel to the bedding plane of the coal. The radii of gyration, surface area, volume fraction, and size distribution of micropores, mesopores, and fine-size minerals were obtained from an analysis of the SAXS curves. The total volume fraction of these components was determined from the integrated intensity to be 0.09 ± 0.02 cm3 cm−3. The size distributions were found to be trimodal with peaks at 30, 100, and 220 Å. These peaks are associated with micropores, microminerals, and mesopores respectively. The specific surfaces associated with each peak are 140 ± 20, 3 ± 1, and 10 ± 3 m2 g−1, respectively, while the corresponding volume fractions are 0.004 ± 0.001, 0.026 ± 0.005, and 0.056 ± 0.018 cm3 cm−3 respectively. Comparison of the results from SAXS with those from TEM showed good agreement.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0021889878014065
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