Citation: Meichen Jiao, Sitong Liu, Chunmin Jia, Hao Xu, Zhiguo Zhu, Peng Wu, Xian-Ming Zhang. Convenient transformation of FAU zeolites to IWV aluminosilicates with adjustable Al sites for Baeyer-Villiger oxidation[J]. Chinese Journal of Structural Chemistry, ;2025, 44(9): 100654. doi: 10.1016/j.cjsc.2025.100654 shu

Convenient transformation of FAU zeolites to IWV aluminosilicates with adjustable Al sites for Baeyer-Villiger oxidation

The Baeyer-Villiger (BV) oxidation of cyclohexanone is explored using IWV-type aluminosilicates with different Al sites as heterogeneous catalysts. The IWV framework exhibits a two-dimensional 12-membered ring (MR) pore system intersected by 14-MR supercages, resembling typical beta zeolite. To address the constraints associated with hydrothermal synthesis, IWV aluminosilicates were synthesized via interzeolite transformation of various FAU-type zeolites. HF-assisted transformation of dealuminated FAU zeolite resulted in the formation of a high-silica IWV aluminosilicate (Si/Al = 54.6), whereas the incorporation of aluminum isopropoxide enables the tuning of Si/Al ratio down to 18.7. The alkaline conversion of protonated FAU zeolites, utilizing Na+ ions as mineralizing agents, produces high-Al content IWV derivatives in just four days. Catalytic evaluation demonstrates that the high-silica IWV catalyst exhibits a higher turnover number than the other IWV catalysts, along with enhanced ε-caprolactone (CL) selectivity relative to that of high-silica beta zeolite. Facile modifications are performed to adjust Al sites, as characterized by pyridine-adsorbed infrared spectroscopy. Experimental evidence confirms that Al Brønsted acid sites improves the selective oxidation of cyclohexanone, while concurrently enhancing CL hydrolysis.
- Interzeolite transformation,
- IWV aluminosilicates,
- Aluminum content,
- Baeyer-Villiger oxidation,
- ε-caprolactone
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