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8710769 
Journal Article 
Selective adsorption of NaX zeolite and its scandium-substituted zeolites 
Youssef, AM; Selim, MM; El-Nabarawy, T 
1979 
8 
1 
67-74 
English 
The adsorption of argon and nitrogen at -195% °C, of CO2 at -78 °C and of benzene, cyclohexane, methanol and water vapour at 30 °C was measured on NaX zeolite and on its scandium-substituted zeolites. In all cases, cyclohexane measures the lowest adsorption capacity and water vapour measures the highest. The adsorption capacity depends on the extent of cation replacement and on the nature and mode of interaction between the adsorbed molecules and the surface of the zeolites. The lattice contraction due to the substitution of sodium ions by smaller scandium ions unexpectedly resulted in an increase in the adsorption capacity of all the adsorbates investigated. 1979.