Adsorption and adsorption-induced deformation of NaX zeolite under high pressures of carbon dioxide

Isotherms of carbon dioxide adsorption and adsorption-induced deformation o f pelletized crystalline NaX zeolite at pressures of 0.2-5.4 MPa and temper atures of 195-423 K are measured. The adsorption deformation is positive at low zeolite micropore filling (a < 1 mmol g(-1)) at all temperatures, i.e. , the zeolite suffers expansion. Further, as the amount of the adsorbed sub stance increases, the adsorption deformation curves pass first through a ma ximum and then through a minimum. In the range of high fillings (a > 7 mmol g(-1)) the NaX zeolite shows dramatic expansion.