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Microporous Silicon Nitride-Based Solid Bases

Published online by Cambridge University Press:  15 February 2011

J. S. Bradley
Affiliation:
Max-Planck-Institut ftir Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülihei Man der Ruhr, Germany. bradley@mpi-muelheim.mpg.de
O. Vollmer
Affiliation:
Max-Planck-Institut ftir Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülihei Man der Ruhr, Germany. bradley@mpi-muelheim.mpg.de
R. Rovai
Affiliation:
Max-Planck-Institut ftir Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülihei Man der Ruhr, Germany. bradley@mpi-muelheim.mpg.de
F. Lefebvre
Affiliation:
Laboratoire de Chimie Organométallique de Surface, UMR CNRS-CPE 9986 43 Bd du 11 novembre 1918, 69616 Villeurbanne Cedex. France
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Abstract

High surface area, microporous, amorphous silicon imidonitride, characterized by infrared spectroscopy, MAS 29Si NMR and surface area and porosity measurements has been prepared by the treatment of co-oligomers of methylsilazane and dimethyl silazanes with gaseous ammonia at temperatures up to 700°C. The material has a narrow pore-size distribution showing a maximum in the range associated with wide- pore zeolites (ca. 0.72 nm mean). Variation of the organic content of the silazane is a means of controlling the surface area of the resulting solid. The Knoevenagel condensation reaction of benzaldehyde with a series of active methylene compounds has been used to probe the basicity and size-selectivity of these microporous solid base catalysts.

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Type
Research Article
Copyright
Copyright © Materials Research Society 1999

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