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 Friedman's isoconversional method and Kissinger's 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 Friedman's isoconversional method, involving the first order reaction model, enabled the satisfactory fit of the experimental data.

► The reduction of Ag2O by hydrogen was studied by thermogravimetry.
► The data were analysed by expanded Friedman isoconversional method.
► The kinetic triplet Eα = 59.7 kJ mol−1, A = 4.33 × 105 s−1, f(α) = 1 − α was found.
► The Avrami–Erofeev reaction model with n = 1 vas suggested to be applicable.