Physicochemical characteristics of pillared interlayered clays

A series of pillared interlayered clays (PILCs) including Al-, Ti- and Zr-P ILCs have been prepared and characterized by X-ray diffraction, elemental a nd thermal analyses, N-2 adsorption, NH3 temperature-programmed desorption and IR measurements after pyridine adsorption. It was found that Al-PILC re latively contained higher microporosity and surface acidity than Zr- and Ti -PILCs. However, Al-PILC reveals weaker thermal stability than the other PI LCs. To overcome this drawback, the addition of lanthanum. (La), cerium (Ce ) or yttrium (Y) as the second metal component to Al-PILC has been attempte d. The overall results of this study demonstrate that the addition of Y sig nificantly enhances the thermal stability of the resulting PILC with little change in the acidity compared to that of the other second metals. (C) 200 1 Elsevier Science B.V. All rights reserved.