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ChemInform Abstract: Synthesis and Structure of ITQ-3, the First Pure Silica Polymorph with a Two-Dimensional System of Straight Eight-Ring Channels.

✍ Scribed by M. A. CAMBLOR; A. CORMA; P. LIGHTFOOT; L. A. VILLAESCUSA; P. A. WRIGHT

Publisher: John Wiley and Sons
Year: 2010
Weight: 33 KB
Volume: 29
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199812015

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✦ Synopsis

Synthesis and Structure of ITQ-3, the First Pure Silica Polymorph with a Two-Dimensional System of Straight Eight-Ring Channels.

-Pure silica [SiO 2 ] 64 (ITQ-3) is obtained from SiO 2 by hydrothermal synthesis .1]octane as structuredirecting agent (H 2 O, HF, 150 • C, autoclave, 7 d) and subsequent calcination. XRD analysis shows an orthorhombic crystal system with Cmcm symmetry. Calcined ITQ-3 consists of a three-dimensional framework of 4-connected SiO 4 -tetrahedra with no Si-O-Si connectivity defects. This polymorph exhibits a very low framework density (FD) of 16.3, which is the second lowest FD among silica polymorphs. -(CAMBLOR, M.

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