The N2 adsorption isothermal and thermo-gravimetric analysis was carried out to study the characteristics of semi-coke generated by high-moisture Indonesia lignite at different pyrolysis temperatures.The results indicate that

within the pyrolysis temperature range of 500℃to 550℃

the surface area and pore volume of the semi-coke decreased first and then increased

finally they leveled off at 650 ℃.Under the same pyrolysis conditions

the char derived from high-moisture Indonesia lignite had much more developed pore structure than that from the lignite with low moisture.The thermo-gravimetric analysis suggests that

with an increase in pyrolysis temperature

the maximum weight loss rate of the chars during combustion decreased first and then increased a little

it reached the minimum value at about 600℃.The activation energy of the char during combustion increased with the pyrolysis temperature.