Direct hydrogenation of carbons by isothermal microthermogravimetry at atmospheric pressure

The effect of hydrogen partial pressure on the hydrogenation rate of lignite char has been studied at pressures between 0.3 and 1 atm and temperatures between 820 and 940°C by thermogravimetry. The apparent order as a function of hydrogen pressure and the activation energy of this reaction have been determined. Under the experimental conditions investigated in this work, after gasification of about 70% of the lignite char, the hydrogenation rate decreases rapidly.