Physicochemical Characteristics of Pillared Interlayered Clays

Abstract

A series of pillared interlayered clays (PILCs) including Al-, Ti- and Zr-PILCs have been prepared and characterized by X-ray diffraction, elemental and thermal analyses, N-2 adsorption, NH3 temperature-programmed desorption and IR measurements after pyridine adsorption. It was found that Al-PILC relatively contained higher microporosity and surface acidity than Zr- and Ti-PILCs. However, Al-PILC reveals weaker thermal stability than the other PILCs. To overcome this drawback, the addition of lanthanum. (La), cerium (Ce) or yttrium (Y) as the second metal component to Al-PILC has been attempted. The overall results of this study demonstrate that the addition of Y significantly enhances the thermal stability of the resulting PILC with little change in the acidity compared to that of the other second metals. (C) 2001 Elsevier Science B.V. All rights reserved.