Abstract:The vapor phase Beckmann rearrangement of cyclohexanone oxime (CHO) was carried out over TS-1 with an MFI pore structure and SSZ-31 and SSZ-24 with pore sizes larger than that of MFI to elucidate the effect of the pore size on catalyst deactivation. The deactivation constant over SSZ-24 was the highest among the zeolites used in the study. Furthermore, when the ratio between the molecular size of ε-caprolactam (CL) and the pore size of zeolite was unity, the deactivation constant was maximum over the zeolites … Show more
“…3b have significantly larger residual line widths leading to a partial overlap of the resonances at 2 and 5 ppm. Adsorption of cyclohexanone oxime (diameter of 0.65 nm [40]) on D-ZSM-5 is accompanied by the occurrence of a low-field 2 H MAS NMR signal at 12 ppm (Fig. 3c).…”
Section: H Mas Nmr Investigations Of Non-deuterated Silicalite-1 Anmentioning
1 H and 2 H 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.
“…3b have significantly larger residual line widths leading to a partial overlap of the resonances at 2 and 5 ppm. Adsorption of cyclohexanone oxime (diameter of 0.65 nm [40]) on D-ZSM-5 is accompanied by the occurrence of a low-field 2 H MAS NMR signal at 12 ppm (Fig. 3c).…”
Section: H Mas Nmr Investigations Of Non-deuterated Silicalite-1 Anmentioning
1 H and 2 H 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.
Introduction
The [3,3]‐Sigmatropic Rearrangements
The [2,3]‐Sigmatropic Rearrangements
The Dyotropic Rearrangements
The
B
amberger Rearrangements
The
B
eckmann Rearrangements
The
N
eber Rearrangements
The
L
ossen Rearrangement
Other Rearrangements
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