An article written by T. Muangthong-on, J. Wannapeera, H. Ohgaki, K. Miura was published in Energy Fuels.
Title; Examination of interactions of solvent treated coal with oxygen and water vapor at over 100 °C using TG-DSC for examining propensity to spontaneous heating of the solvent treated coal
DOI: 10.1021/acs.energyfuels.7b01906
Advanced Energy Generation Division　Quantum Radiation Energy Research Section

Amount of heat generated when a brown coal and solvent treated coals are exposed to either dry air or a wet air (RH = 20%) at 107ºC

Large amount of heat is generated when exposed to the wet air even at 107 ºC
Solvent treated coals, STC and Residue, have smaller propensity to spontaneous heating