Name : The 56th Conference of Coal Science
Number : 56
Location : [in Japanese]
Date : October 29, 2019 - October 30, 2019
Pages 46-47
To characterize the chemical structure of oxidi zed coal, solid state1 H and 13C NMR spectra were acquired for t wo kinds of coal Y and Z before and after estimation of their self-heating property by using R70 apparatus. It was found that coal Y with low er carbon concentration reached 70ºC in shorter time than coal Z. I t is indicated that some aldehyde and ketone were generated and aromatic carbnons combined to hydrogen consumed during the oxidation. Furthermore, measurement of gas species generated during oxidation at 80°C in 18O2 atomsphere by multi-turn tme-of-flight mass specrometer indicated that C16O and C16O2 were mainly released from coal Y. It is suggested that decomposition of aldehyde and carboxylic acid might competed with generation of aldehyde and ketone at less than 80°C.
