抄録
Changes in the nitrogen gas adsorption by synthetic sodium X-type zeolite by pretreatment conditions were examined, and the relationship between the rate of dehydration and amount of nitrogen gas adsorption was clarified. The sample dehydrated at 10-4 mmHg and below 50° dose not show adsorption of nitrogen gas into the zeolite lattice and adsorption occurs at above 70°, and at 10-1 mmHg, adsorption of nitrogen gas did not occur until above 100°. By the use of differential thermal balance at a reduced pressure, effective volume of water contained in 1g of dehydrated zeolite was calculated as 0.4ml and that of nitrogen as 0.3 ml. This difference was considered to be due to the presence of a lattice space in which water molecule can enter but not nitrogen molecule. The failure of nitrogen gas adsorption even after desorption of about 50% of water was assumed to be due to interference of ice remaining in the lattice space.
