The CO2 gasification of South Open-pit Mines coal from Zhundong Field of
China using Ca(OH)2 or K2CO3 as catalyst with different loading methods and
contents were conducted in thermogravimetric analysis. Comparison of the
gasification reactivity and rate of coal loaded various concentration of
Ca(OH)2 concluded that the increase of Ca(OH)2 loading pronouncedly improved
the reactivity and rate for grinding method; nevertheless, for impregnation
and high pressure method the increase of Ca(OH)2 loading observed a similar
catalytic effect on char gasification. However, the catalytic effect of
K2CO3 revealed that the catalytic activity increased with the increase of
K2CO3 loading for three loading method. For the same catalyst loading, the
highest catalytic gasification reactivity achieved for Ca(OH)2 and K2CO3
were the loading methods of high pressure and grinding, respectively. In
addition, the gasification of raw char, K2CO3 loaded char and Ca(OH)2 loaded
char were quantitatively evaluated by kinetic analysis using shrinking core,
random pore and modified random pore models.
Effects of K2CO3 and Ca(OH)2 on CO2 gasification of char with high alkali and alkaline earth metal content and study of different kinetic models
