Mixed-oxide pillared silicates from H-ilerite by intercalation

Al-, Ti-, and Zr-containing silica-based pillars of which Si4+ is isomorpho usly substituted by each ion have been formed between the silicate layers o f H-ilerite by intercalation of octylamine and mixed alkoxides. The resulta nt silica-based pillared materials have a BET surface area of about 800 m(2 )/g at 600 degrees C: and have the gallery heights of 2-3 nm and micropores of >2 nm in size between the silicate layers. The increase in the amount o f metal introduced into the silica-based pillars was accompanied by a chang e in the pillar configuration, which led to the formation of the microporou s products with uniform pore diameters of similar to 0.90 nm and the irregu lar gallery height. The Si-29 MAS NMR, Al-27 MAS NMR, and UV-vis spectra re vealed the incorporation of Al, Ti, and Zr atoms as isolated elemental site s into the silicate pillar framework.