Issue 11, 2023

Surface silanol sites in mesoporous MFI zeolites for catalytic Beckmann rearrangement

Abstract

Silanol groups were generated in siliceous MFI zeolite nanosheets, via alkali-free synthesis routes, for catalytic application for gas-phase Beckmann rearrangement. The catalytic conversion by the zeolite nanosheets was investigated at 310 or 350 °C with cyclohexanone oxime, 4-phenylcyclohexanone oxime and cyclododecanone oxime. Here, cyclohexanone oxime was chosen as a small reactant that should be able to diffuse into the zeolite micropores, while the others were too bulky to diffuse. The catalytic conversion was analyzed in reference to a previous method used to generate hydrogen-bonded silanol nests in bulk-crystalline MFI zeolites using NH3/NH4+. The result of the analysis indicated that the silanol nest was necessary for the catalytic conversion of cyclohexanone oxime and 4-phenylcyclohexanone oxime, but isolated silanols on the external surface were sufficient for the reaction of cyclododecanone oxime.

Graphical abstract: Surface silanol sites in mesoporous MFI zeolites for catalytic Beckmann rearrangement

Supplementary files

Article information

Article type
Paper
Submitted
20 Apr 2023
Accepted
01 May 2023
First published
02 May 2023

Catal. Sci. Technol., 2023,13, 3436-3444

Surface silanol sites in mesoporous MFI zeolites for catalytic Beckmann rearrangement

H. Park, J. Bang, H. Park, J. Kim, J. Kim, J. Y. Park and R. Ryoo, Catal. Sci. Technol., 2023, 13, 3436 DOI: 10.1039/D3CY00543G

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