Semicoke Kittanning coal

Figure 5, Transmitted electron micrograph of semicoke from Lower Kittanning coal after heating to 500°C,...

Spectra of semicokes from the Lower Kittanning coal are shown in Figure 9 The spectrum with the most distinct peaks in this series is the 500 C semicoke However, as in the case of the Illinois No 6 series, there is not the marked improvement in spectral quality at the temperature of maximum fluidity that we observed in the Pittsburgh Seam series There is also evidence of carbonyl groups at 1740 cm in this series of semicokes — possibly corresponding to esters ... 

Figure 9, Spectra of semicokes prepared from Lower Kittanning coal at various heat-treatment temperatures.

Figure 5 shows rod-shaped features in the 500 C Lower Kittanning semicoke seen in the transmitted electron mode. Although 500 C is beyond the temperature of resolidification measured in the plastometer, the temperatures reported for low-fluidity coals are not as meaningful as those for high-fluidity coals. In addition, fluid properties of many samples of low-fluidity coals cannot be measured in the plastometer. Accordingly, the temperatures measured for one sample may not be applicable to other samples of the same low-fluidity coal. 

Figure 10. Spectra showing the aromatic hydrogen out-of-plane bending vibrations in different coals and semicokes—25 times accumulation. Key top row, Pittsburgh No, 8 middle row, Lower Kittanning and bottom row, Illinois No. 6.

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