Study of Metal-Humic Catalysts before and After the Gas Desulphurization Process Using Thermal Analysis

The study of metal-humic catalysts before and after the SO 2 conversion has been carried out using thermal analysis. The thermogravimetric analysis and differential thermal analysis has been carried out using Perkin-Elmer TGA 7 and DTA 7 equipment in an argonic atmosphere. The heating rate of samples in the DTA was 10 °C/min., and in the TGA 40 °C/min. The following catalysts have been chosen for analysis: H-Pb2+/450 °C, H-B/450 °C, H-Sn 2+/ 450 °C, H-Ce 4+ . The study of metal-humic catalysts using thermal analysis has shown that, in the DTA curves of studied catalysts before SO 2 conversion, endothermic peaks related to decomposition of metal carbonates, melting of metals or decomposition of metal-humic bonding. In the DTA curves after the SO 2 conversion process, there are additional endothermic peaks related to the presence of sulphur in the metal-humic compounds and to thermal decomposition of those bonds.