| Popis: |
In this study, the catalytic effects of impregnated catalysts of K2CO3, alkali earth, and transition metal salts in lignite-CO2 gasification were investigated. The gasification experiments were conducted over a temperature range of 800–900 °C at atmospheric pressure. Catalysts such as K2CO3, Ca(OH)2, CaCO3, Ce(NO3)3, and Fe(NO3)3 were impregnated on Mongolia coal using aqueous solutions in a rotary evaporator. The modified volumetric reaction model of the gas-solid reaction was applied to the experimental data to obtain kinetic information. The catalytic activity of single catalysts followed the sequence K2CO3 > Ca(OH)2 > CaCO3 > Fe(NO3)3 ≈ Ce(NO3)3. The reaction rate with K2CO3 can be enhanced by the addition of Ca(OH)2. The synergistic effect of K2CO3 4 wt. % + Ca(OH)2 1 wt. % exhibited the highest catalytic activity at 900 °C and the lowest activation energy. |
