| Popis: |
In this study, we investigated reaction rate constant and activation energy of CO2 lignite gasification by using waste catalysts (I, II, III) and K2CO3. The gasification experiments were conducted with the lignite which was mixed physically with the catalysts of 1 wt%, 5 wt%, 10 wt% by thermogravimetry with TGA at 800 °C, 850 °C and 900 °C. The experimental data was analyzed with kinetic models (VRM, SCM and MVRM). MVRM was the most suitable among the three models. It was confirmed that gasification rate increased with increasing temperature and the activation energies of CO2 gasification of lignite with mixed waste catalysts were lower than that of lignite alone at all temperatures. Especially, 10 wt% of waste catalyst III showed the lowest activation energy, 92.37 kJ/mol, among all lignite-char with catalysts. |
