Abstract
New classes of selective heterogeneous catalysts have been prepared by the intercalation of polynuclear hydroxo complexes in smectites. Only limited number of complexes such as aluminum and zirconium hydroxo complexes are suitable for pillaring agents. New approches to extend the number of pillaring agents have been made and oxide clusters of SiO2, Fe2O3, Nb2O5 and Ta2O5 were produced in the interlayer regions. Preparation of the pillared material from non-silicate layered inorganic compounds was attempted by using K4Nb6O17·nH2O. Nickel and aluminum hydroxo complexes were taken up into the interlayer regions, but the interlayer spacings were not as large as those of pillared clays.
