Characterization of acid sites in zeolitic and other inorganic systems using solid-state 31P NMR of the probe molecule trimethylphosphine oxide
Article Abstract:
The utilization of trimethylphosphine oxide (TMPO) and the solid state 31P nuclear magnetic resonance (NMR) in the acidity studies of zeolites and aluminas were evaluated. The determination of acidic forms exhibited by high-surface materials is significant in catalytic reactions. It was revealed that the use of the solid state 31P NMR of the probe molecule TMPO was effective in identifying the forms and amounts of acid sites on the zeolitic and amorphous materials.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Propene adsorption sites in zeolite ITQ-12: A combined synchrotron X-ray and neutron diffraction study
Article Abstract:
The adsorption site of propene in the small-pore, pure silica zeolite is characterized via Rietveld refinement of the crystal structure of propene-loaded ITQ-12 on the basis of synchrotron X-ray and neutron diffraction data taken at 298 K. At this site, the adsorbed propene molecule lies on a plane close and approximately parallel to the equatorial plane of the cage and is aligned with its methylene group pointing towards the pore's eight-ring window.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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Crystal structure of dehydrated CsZSM-5 (5.8Al): evidence for nonrandom aluminum distribution
Article Abstract:
The first of a series of diffraction studies designed to produce information on the distribution of Al in the ZSM-5 structure is presented. It is concluded that Cs+ ion positioning provides information on aluminum atom distribution.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
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