Bituminous coal macerals, distribution

Table II. Distribution of Organic Sulfur in Bituminous Coal Macerals (86)...

Grady W. C., Eble C. F., and Neuzil S. G. (1993) Brown coal maceral distributions in a modern domed tropical Indonesian peat and a comparison with maceral distributions in middle Pennsylvanian-age Appalachian bituminous coal beds. In Modem and Ancient Coal-forming Environments, Geological Society of America Special Paper 286, (eds. J. C. Cobb and C. B. Cecil). Geological society of America, Tulsa, OK, pp. 63 —82. 

Direct Characterization Techniques. The in situ analysis of elemental composition of coals by ion microprobe was first demonstrated by Dutcher t al. (85). Raymond (86) has applied this technique to examine the variation in composition of coal macerals which has been especially effective for looking at sulfur distribution. An example of the organic sulfur distribution for two bituminous coals is shown in Table II which is taken from reference (86). Note that the liptinites contain the... 

Figure 2. Maceral density distribution of a high volatile bituminous coal, PS0C-106. All densities are aqueous densities at 25 °C. Magnification of photographs is 1250x.

The shape and size of pores in two high-volatile bituminous coals of differing lithotypes have been directly observed by means of TEM. The distributions of the porosity with respect to their maceral associations were ascertained, as were the sizes and distributions of the microminerals. The use of stereo pairs revealed the interconnectivity of the pores in microvolumes of the macerals, indicating a high degree of permeability within those regions. 

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