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Abstract
The equilibrium isotherms and the rate of adsorption have been measured for anilines and cresols on different zeolites by the usual gravimetric method using Microforce balance system. The adsorption isotherms of different anilines on NaX and different exchanged zeolites were fitted in Langmuir, Nitta, and virial isotherms and various adsorption parameters were calculated. Diffusivity studies show that the rate of adsorption depends on the diameter of the molecule and the channel diameter. Diffusivities were observed to be concentration-independent and closely consistent with the Arrhenius relationship with activation energies as high as 96.6 kJ/mol. The infrared analysis of the induced bands of anilines and cresols on zeolites shows some additional bands related to N–H and O–H in anilines and cresols. The shift in these bands with respect to aniline and cresol spectra indicates the specific adsorption. Major shifts of the peaks are due to the lone pair–Lewis acid site interaction.