Synchrotron X-ray powder diffraction and computational investigation of purely siliceous zeolite Y under pressure

Marek Colligan, Paul M. Forster, Anthony K. Cheetham, Yongjae Lee, Thomas Vogt, Joseph A. Hriljac

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Abstract

High-pressure synchrotron X-ray powder diffraction measurements of a sample of purely siliceous zeolite Y (faujasite) were carried out up to 8.0 GPa at room temperature using a diamond anvil cell. Measurements using silicone oil as the pressure-transmitting medium show compression of the zeolite followed by a loss of long-range ordering at 2.2 GPa. The experimentally determined bulk modulus, 38(2) GPa, is, within experimental error, identical to that of quartz. When using a methanol;ethanol:water mixture (16:3:1) as the pressure- transmitting medium, two distinct compressibility regions are observed with a dramatic change in the compression mechanism at 4 GPa. Rietveld refinement analysis of the powder patterns provides a detailed description of the underlying chemistry, with sequential pore filling the main response up to 4 GPa and framework distortions at higher pressures.

Original languageEnglish
Pages (from-to)12015-12022
Number of pages8
JournalJournal of the American Chemical Society
Volume126
Issue number38
DOIs
Publication statusPublished - 2004 Sep 29

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All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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