Article révisé par les pairs
Résumé : Previously, we constructed an isothermal balance with two symmetrical pans for operation under pressure [1] in which we studied the hydrogenation kinetics of coal chars under pressures up to 5 MPa [2]. The modified version of this balance, makes it possible to study the direct hydrogenation of coals without any preliminary treatment. The balance was tested on an Italian coal, "Sulcis", with a high sulfur content. © 1983.