ANALYSIS AND COMPARISON OF THE MICROPOROSITY IN AL-PILLARED, ZR-PILLARED AND TI-PILLARED CLAYS

The microporous accessibility of three pillared clays (Al-, Zr- and Ti -PILC) and two zeolites as references have been studied. Nitrogen adso rption data obtained at very low relative pressures were used to obtai n a thorough characterization of the microporosity of the samples. The Dubinin-Radushkevich (DR) formalism was used to describe the volume f iling of micropores and the energetic heterogeneity of microporous sol ids. The adsorption potential distributions and the Horvath-Kawazoe mo del confirm the existence of two sizes of micropores in the pillared c lays and one size in the zeolites. Nevertheless, the two zeolites show a larger microporosity than the three pillared clays studied.