학술논문
Accessibility and interaction of surface OH groups in microporous and mesoporous catalysts applied for vapor-phase Beckmann rearrangement of oximes
Document Type
Academic Journal
Author
Source
Catalysis Letters. March 1, 2010, Vol. 135 Issue 1-2, p91, 7 p.
Subject
Language
English
ISSN
1011-372X
Abstract
1 Introduction Manufacturing of nylon-6 fibres requires ζ-caprolactam as reactant, which is mainly produced via the liquid-phase Beckmann rearrangement reaction [1-3]. However, the conventional liquid-phase process has important disadvantages due [...]
¹H and ²H MAS NMR spectroscopy were utilized for investigating the interaction of surface complexes upon adsorption of cyclohexanone and cyclododecanone oxime on MFI-type zeolites and [Al]SBA-15. Signals of hydrogen-bonded and protonated complexes were identified and evidenced the diffusion of cyclohexanone oxime into the micropores of silicalite-1 and ZSM-5 and limited accessibility of acid sites in [Al]SBA-15 for cyclododecanone oxime. Keywords Beckmann rearrangement * Cyclohexanone oxime * Porous catalysts * Acid sites * Accessibility * Solid-state NMR spectroscopy
¹H and ²H MAS NMR spectroscopy were utilized for investigating the interaction of surface complexes upon adsorption of cyclohexanone and cyclododecanone oxime on MFI-type zeolites and [Al]SBA-15. Signals of hydrogen-bonded and protonated complexes were identified and evidenced the diffusion of cyclohexanone oxime into the micropores of silicalite-1 and ZSM-5 and limited accessibility of acid sites in [Al]SBA-15 for cyclododecanone oxime. Keywords Beckmann rearrangement * Cyclohexanone oxime * Porous catalysts * Acid sites * Accessibility * Solid-state NMR spectroscopy