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An X-ray Diffraction and MAS NMR Study of the Thermal Expansion Properties of Calcined Siliceous Ferrierite

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Author(s)

I Bull, Philip Lightfoot, LA Villaescusa, LM Bull, RKB Gover, JSO Evans, Russell Edward Morris

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Abstract

Powder and single-crystal X-ray diffraction, combined with MAS NMR measurements, has been used to study the thermal expansion of siliceous zeolite ferrierite as it approaches a second-order displacive phase transition from a low-symmetry (Pnnm) to a high-symmetry (Immm) structure. Below the transition temperature, ferrierite exhibits positive thermal expansivity. However, above the transition temperature a significant change in thermal behavior is seen, and ferrierite becomes a negative thermal expansion material. Accurate variable-temperature single-crystal X-ray diffraction measurements confirm the transition temperature and allow the changes in average atomic position to be followed with temperature. The results from the single-crystal X-ray diffraction study can be correlated with Si-29 MAS NMR chemical shifts for the low-temperature phase. At low temperatures the results show that the positive thermal expansivity is driven by an overall increase in Si-Si distances related to an increase in Si-O-Si bond angles. However, in the high-temperature phase the Si-O-Si angles are approximately invariant with temperature, and the negative thermal expansion in this case is caused by transverse vibrations of the Si-O-Si units.

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Details

Original languageEnglish
Pages (from-to)4342-4349
Number of pages8
JournalJournal of the American Chemical Society
Volume125
DOIs
Publication statusPublished - 9 Apr 2003

    Research areas

  • ZEOLITE, FORMS, MFI

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