Microporous Silicon Nitride-Based Solid Bases

Autor:	John S. Bradley, Riccardo Rovai, Frédéric Lefebvre, Oliver Vollmer
Rok vydání:	1998
Předmět:	Amorphous silicon chemistry.chemical_compound Materials science Silicon nitride chemistry Chemical engineering Infrared spectroscopy Knoevenagel condensation Silazane Microporous material Porosity Catalysis
Zdroj:	MRS Proceedings. 549
ISSN:	1946-4274 0272-9172
DOI:	10.1557/proc-549-33
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::6bf621ac4e0915a30d84f3580b46c125 https://doi.org/10.1557/proc-549-33 Zobrazit plný text záznamu Full text from SpringerLink