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In this study, we have investigated the kinetics on the char-CO2 catalytic gasification reaction. Thermogravimetric analysis (TGA) experiments were carried out for char-CO2 catalytic gasification of an Indonesian Kideco sub-bituminous. Na2CO3 and K2CO3 were selected as catalysts which were physically mixed with coal. The char-CO2 catalytic gasification reaction showed a rapid increase of carbon conversion rate at 850 ℃, 60 vol% CO2, and 7 wt% Na2CO3. At the isothermal conditions ranging from 750 ℃ to 900 ℃, the carbon conversion rates increased as the temperature increased. Four kinetic models for gas-solid reaction including the shrinking core model (SCM), random pore model (RPM), volumetric reaction model (VRM), and modified volume- tric reaction model (MVRM) were applied to the experimental data against the measured kinetic data. The gasification kinetics were suitably described by the MVRM for the Kideco sub-bituminous. The activation energies for each char mixed with Na2CO3 and K2CO3 were found 55-71 kJ/mol and 69-87 kJ/mol.

Reactivity Study on the Kideco Coal Catalytic Coal Gasification under CO2Atmosphere Using Gas-Solid Kinetic Models

Reactivity Study on the Kideco Coal Catalytic Coal Gasification under CO₂Atmosphere Using Gas-Solid Kinetic Models