ADSORPTION AND DIFFUSION OF CARBON-DIOXIDE IN PHENOLIC RESIN CARBONIZATES

The adsorption and diffusion of CO2 in phenolic resin carbonizates pre pared at final carbonization temperatures of 500, 600, and 700 degrees C were investigated at 20 degrees C and pressures of 6 to 130 kPa. Th e experimental data were compared with theoretical dependences obtaine d by numerical solution of differential equations set up based on the occluded gas model and on the model of diffusion through a pore networ k. The former model, which assumes that the diffusion is driven by the concentration gradient of the gas dissolved in the solid, was found t o fit the experimental data better than the latter model.