Microporous titanosilicate ETS-10: A structural survey

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Abstract
The structure of a microporous titanosilicate, ETS-10, has been solved using a combination of electron microscopy, X-ray and electron diffraction, solid-state NMR and distance-least squares analysis. We describe in detail how these tools have been applied to the structural solution. ETS-10 is a highly disordered, yet crystalline, wide-pore microporous framework material containing octahedrally coordinated titanium and tetrahedrally coordinated silicon. The disordered material can be described with respect to two ordered polymorphs: polymorph A, space group P41 or P43 with a = b = 14·8 Å and α = β = γ = 90° polymorph B, space group C2/c with a = b = 21·00 Å, c= 14·51 Å and α = γ = 90°, β= 111·12°. Both polymorphs have'a three-dimensional 12-ring pore system and polymorph A has a spiral channel.