The determination of bronsted acid sites in zeolite ERS-7 by neutron and X-ray powder diffraction

Article Abstract:

A combined Rietveld refinement that simultaneously utilized synchrotron X-ray powder diffraction data and neutron powder diffraction data was used for identifying three Bronsted acid sites of a complex new acidic zeolite, ERS-7. An in-plane hydroxyl tilt angle, which was consistent with the ab initio quantum mechanical calculations and indicated an Al preference for site T4 over T6, was demonstrated by acid site D7.

Usage, X-ray diffraction, Mechanical properties

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MAS NMR studies on the dealumination of zeolite MCM-22

Article Abstract:

Conventional multinuclear solid-state NMR and ultrahigh-field NMR experiments with a very fast spin rate were employed for studying the dealumination of zeolite MCM-22 by calcination or hydrothermal treatment. Different characteristics were shown by MCM-22 zeolite after it was calcinated in air or after hydrothermal treatments at elevated temperatures.

Spectra, Nuclear magnetic resonance, Thermal properties

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Structure and dynamics of confined water in AIPO(sub 4)-5 zeolite

Article Abstract:

An investigation is conducted on the structural and dynamic properties of confined water in AIPO(sub 4)-5 zeolite by neutron scattering experiments during the adsorption process. The objective of the study was to elucidate the peculiar behavior of confined water at the nanoscopic confinement range.

Neutrons, Neutron scattering, Structure

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