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ChemInform Abstract: Structure of ITQ-4, a New Pure Silica Polymorph Containing Large Pores and a Large Void Volume.

✍ Scribed by P. A. BARRETT; M. A. CAMBLOR; A. CORMA; R. H. JONES; L. A. VILLAESCUSA

Publisher: John Wiley and Sons
Year: 2010
Weight: 29 KB
Volume: 28
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.199745003

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✦ Synopsis

Structure of ITQ-4, a New Pure Silica Polymorph Containing Large Pores and a Large Void Volume.

-The new zeolite material ITQ-4 is prepared hydrothermally from a mixture of SiO2, HF, H2O, and an organic template at 150 • C and calcined at 650 • C. The structure (monoclinic, I2/m), which is solved by direct methods from the synchrotron powder XRD data, consists of a 12-membered sinusoidal channel. The sinuosity and the high density of channels explains the large pore volume (0.21 m3/g) which is only surpassed by that of pure silica zeolite beta (0.22 cm3/ g). The high degee of crystallographic order is due to the absence of Al and Si-OH defect structures.

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