Factors affecting particle size
Article Abstract:
The preparation of polymer-stabilized rhodium sols with average metal particle diameters between 1 nm and 3.5 nm have been undertaken. High-resolution transmission electron microscopy, 13C NMR and x-ray absorption spectroscopy were used in analyzing the precursors and the derived sols. It has been observed that particle size is inversely proportional on reduction rate. The physical properties of the stabilizing polymer has a significant influence on the resulting material. Strong coordination resulted in colloids that could not be reduced.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
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Local structure of framework aluminum in zeolite H-ZSM-5 during conversion of methanol investigated by in situ NMR spectroscopy
Article Abstract:
In situ MAS NMR spectroscopy under continuous-flow conditions and spin-echo NMR experiments is applied to investigate the quadrupolar interactions of framework aluminum atoms in zeolite H-ZSM-5 at elevated temperatures and during conversion of methanol. The study can be explained by jumps of the hydroxyl protons between two or three of the energetically favored oxygen atoms of each aluminum site or between different aluminum sites.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2001
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Interaction of methanol with alkali metal exchanged molecular sieves. 1. IR spectroscopic study
Article Abstract:
The adsorption of methanol over various alkali metal exchanged zeolites is studied by in situ IR spectroscopy and gravimetry. It is suggested that the most important interaction occurs between the electron lone-pair donor function of methanol and the electron pair acceptor function of the zeolite.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
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