Synthesis and Catalytic Activity of Sn-MFI Nanosheets for the Baeyer鈥揤illiger Oxidation of Cyclic Ketones

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• 作者：Helen Y. Luo ; Linh Bui ; William R. Gunther ; Elizabeth Min ; Yuriy Rom谩n-Leshkov
• 刊名：ACS Catalysis
• 出版年：2012
• 出版时间：December 7, 2012
• 年：2012
• 卷：2
• 期：12
• 页码：2695-2699
• 全文大小：302K
• 年卷期：v.2,no.12(December 7, 2012)
• ISSN：2155-5435

文摘

Stannosilicate zeolites with nanosheet morphology and MFI topology (Sn-MFI-ns) are successfully synthesized with an amphiphilic organic structure-directing agent. Sn source, Si/Sn ratio, crystallization time and temperature impact framework Sn incorporation and nanosheet morphology. Optimal synthesis conditions generate Sn-MFI-ns with high crystallinity and isolated framework Sn sites. Nanosheets are 2 nm thick in the (010) direction, resulting in large intersheet mesopore volumes and external surface areas exceeding 430 m²/g. Unlike bulk Sn-MFI, Sn-MFI-ns is highly active in the Baeyer鈥揤illiger oxidation of bulky cyclic ketones using hydrogen peroxide (H₂O₂). Although Sn-MFI-ns and Sn-MCM-41 have comparable activity and oxidant efficiency, the nanosheets exhibit drastically higher thermal and hydrothermal stability.

Keywords:

zeolite nanosheets; Baeyer鈭扸illiger oxidation; Sn-MFI; solid Lewis acid