The thermogravimetric study of silver(I) oxide reduction by hydrogen

The reduction of silver(I) oxide to metallic silver by gaseous hydrogen was studied by means of thermogravimetric analysis, at constant heating rates in the range 2.5–30 °C min−1. Under these conditions the reduction process completed in the temperature range 60–190 °C. Both the expanded Friedmanʹs isoconversional method and Kissingerʹs method were used to determine the activation energy, and very similar values, 59.6 kJ mol−1 and 59.7 kJ mol−1, respectively, were obtained. The expanded Friedmanʹs isoconversional method, involving the first order reaction model, enabled the satisfactory fit of the experimental data.