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Abstract
The adsorption behavior and the differential heat of adsorption of chloroform were measured on various types of zeolite (faujasite, ZSM-5 and mordenite) with different Si/Al ratios. The results reveal that saturated adsorption is almost proportional to the micropore volume and is independent of the micropore structure or the Si/Al ratio. However, initial heat of adsorption was the highest (90 kJ mol−1) on the mordenite with low Si/Al ratio, while low on the faujasite with high Si/Al ratio or ZSM-5 (50 kJ mol−1). Change in initial heat of adsorption with Si/Al ratio is small for faujasite or mordenite and large for ZSM-5. For the comparison, trichloroethylene adsorption behavior of zeolite was also investigated. Saturated adsorption of trichloroethylene was almost constant for all types of zeolite, while the faujasite with high Si/Al ratio exhibited an adsorption isotherm of type V in BDDT (Brunauer, Deming, Deming and Teller) classification. The tendencies of heat of immersion are similar to the results of the initial heat of adsorption.
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