Abstract
Thermal behaviour of coal-derived asphaltenes was investigated under atmospheric pressure by thermogravimetry (TG). The weight loss is rapid from 300 to 500°C and is slow above 500°C. The asphaltene comparatively low in molecular weight shows the greater weight loss. The temperature at which the differential thermogravimetry peak appears, T m, correlates to the asphaltene aromaticity: the asphaltene comparatively high in aromaticity shows higher T m. Of the residual asphaltene after heating up to 600°C, the obtained crystallite thickness through the c-axis direction ( Lc 002) has a correlation with the molecular weight of the parent asphaltene: the parent asphaltene comparatively low in molecular weight produces residual asphaltene of larger Lc 002.
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