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

被引：0

作者：

机构：

[1] Colligan, Marek

[2] Forster, Paul M.

[3] Cheetham, Anthony K.

[4] Lee, Yongjae

[5] Vogt, Thomas

[6] Hriljac, Joseph A.

来源：

Hriljac, J.A. (j.a.hriljac@bham.ac.uk) | 1600年 / American Chemical Society卷 / 126期

关键词：

Methanol - Silicones - Synchrotron radiation - Thermal effects - X ray powder diffraction;

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摘要：

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.

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