Abstract
The coal of Bayah Formation in Lebak Regency, Indonesia have been subjected to attenuated to X-ray diffraction (XRD), to study their chemical and structural characteristics. X-Ray Diffraction (XRD) has been widely used throughout the world and has high accuracy in identifying the molecular structure of coal. Curve-fitting analysis was employed to characterize coal structural. Based on ASTM, the coal rank from this area is high-volatile bituminous B. The research results show all coals have the similar coal structural crystallite characteristics. The value of d002 is in the range of 3.87 to 3.96, reflecting the coals have a low content of crystalline structure. The crystallite height (Lc) and diameter (La) were increase, while d002 decrease in relation of more mature coals. Due to structural parameters (d002, Lc and La) the coals of Bayah Formation dominantly by disordered amorphous structure, with small amount crystallite structure
Highlights
During coalification process, various kinds of inorganic, organic and water materials are involved together, so coal is heterogeneous; and provides diverse physical and chemical characteristics which are reflected in the values of the heterogeneous crystalline structural parameters in coal
The findings in this study indicate that the more mature, the smaller the amorphous structure, which is followed by an increase in crystallite height and diameter; but the interlayer spacing is getting smaller
A total of 5 coal sample from Bayah Formation, Indonesia have been identified the structural characteristic based on X-ray diffraction (XRD) measurement
Summary
Various kinds of inorganic, organic and water materials are involved together, so coal is heterogeneous; and provides diverse physical and chemical characteristics which are reflected in the values of the heterogeneous crystalline structural parameters in coal. XRD is a non-damage method that is often used to study the crystallite structural of materials containing carbon, such as coal Haenel (1992), Lu et al (2001), Vivek et al (2016). Several indicators of crystal structure in coal measured by XRD are stacking height of crystallite (Lc), average lateral sizes (La), interlayer spacing of the crystalline structure (d002), aromaticity (fa). The coal rank was controlled the development of coal crystal structure parameter. In the throughout the coalification process, an increase crystal structure of coal and a decrease in the amorphous structure Jiang et al (2019).
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