Beckmann rearrangement of cyclohexanone oxime over Silicalite-1: an FT-IR spectroscopic study

Autor:	C Flego, L Dalloro
Rok vydání:	2003
Předmět:	Reaction mechanism Cyclohexanone oxime Caprolactam Infrared spectroscopy General Chemistry Condensed Matter Physics Oxime Photochemistry Catalysis chemistry.chemical_compound chemistry Mechanics of Materials Desorption Beckmann rearrangement General Materials Science
Zdroj:	Microporous and Mesoporous Materials. 60:263-271
ISSN:	1387-1811
DOI:	10.1016/s1387-1811(03)00385-8
Popis:	The study of cyclohexanone oxime (CEOX) adsorption and reaction into e-caprolactam (CPL) by FT-IR spectroscopy was performed with Silicalite-1 (S-1) as a catalyst. Information of both active sites and reaction mechanism of the Beckmann rearrangement was obtained. At low temperature the physical sorption of CEOX on/in S-1 is the most relevant phenomenon. The accessibility of the internal OH’s to the reactant increases at higher temperatures due to an easier diffusion. At 200 °C CEOX molecules present inside the zeolite are in proximity of the most acidic OH groups of S-1, the OH nests. The co-operation of more than one OH site transforms CEOX into e-CPL, allowing the right reactant-active site configuration and favouring the stabilisation of the intermediate.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::abf77d1b763c83d438f35c1683ef51fc https://doi.org/10.1016/s1387-1811(03)00385-8 Zobrazit plný text záznamu Full Text from ScienceDirect