Abstract
Al-, Ti-, and Zr-containing silica-based pillars of which Si4+ is isomorphously substituted by each ion have been formed between the silicate layers of H-ilerite by intercalation of octylamine and mixed alkoxides. The resultant silica-based pillared materials have a BET surface area of about 800 m2/g at 600 °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 of metal introduced into the silica-based pillars was accompanied by a change in the pillar configuration, which led to the formation of the microporous products with uniform pore diameters of ∼0.90 nm and the irregular gallery height. The 29Si MAS NMR, 27Al MAS NMR, and UV−vis spectra revealed the incorporation of Al, Ti, and Zr atoms as isolated elemental sites into the silicate pillar framework.
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