The reaction rate per unit mass of wood char was an order of magnitude larger than that of coke and graphite and that of glassy carbon was an order of magnitude smaller than the latter. However, the reaction rate per unit surface area of wood char was smaller than that of graphite. The reaction of coke proceeded homogeneously at temperatures lower than 1373 K, while the reaction was restricted to the surface layer at higher temperatures. The tensile strength of coke after reaction decreased with the reaction degree at 1273 K, but was not changed or even increased at 1573 K. This is due to the fact that at 1573 K the core of the sample was not attacked by CO2 but strengthened by further crystallization.
In order to get a highly reactive carbonaceous material at low temperature, the reaction kinetics of various carbonaceous materials with different structure was investigated. The reaction rate was the largest for Bintyo char and bamboo char on unit mass base, but it was the largest for graphite on unit area base. The rate had a positive relation with the amount of CO adsorption, showing that the rate determining step would be the desorption of CO from the active site on the surface. The rate independent of surface area was derived from the data of the rate and amount of CO adsorption per unit area.
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