Abstract:In this paper, we explore the use of high resolution transmission electron microscopy (HRTEM) in the degradation of the poly aromatic hydrocarbon (PAH) in coals of different ranks subjected to chemical plus heat treatment. The crystallite diameter on peak (10) approximations, La (10), of 37.6 Å for the high rank coal char at 700 o C fell within the HRTEM's range of minimum-maximum length boundary of 11 x 11 aromatic aromatic fringes (28 -44 Å). The L a (10), 30.5 Å for the low rank lignite chars fell nearly on… Show more
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