Abstract
A series of fluorine modified TAPO-5 molecular sieves was synthesized by one-pot method using ammo-nium hexafluorotitanate as titanium and fluorine sources. The XPS and DRS UV-Vis results indicated that the exis-tence of F could promote the formation of tetrahedrally coordinated framework Ti and Al, meanwhile, inhibit the formation of anatase TiO2 in TAPO-5 sieves due to the unique role of F in the sol-gel process of metal ions. Further-more, TG, contact angle test, Py-FTIR and 27Al MAS NMR results revealed that fluorine modification increased the surface hydrophobicity and the Lewis acidity of Ti active sites through forming Al x F y units in the neighborhood. All these factors make these fluorine modified TAPO-5 sieves exhibit good catalytic performance in the ammoximation of cyclohexanone.
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Supported by the National Natural Science Foundation of China(Nos.21403135, 21303097, 21305082), and the Science and Technology Research Project of Shanxi Province, China(Nos 201603D121018-1).
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Li, H., Gao, P., Xue, X. et al. Fluorine Modified TAPO-5: Synthesis and Catalytic Performance in Cyclohexanone Ammoximation. Chem. Res. Chin. Univ. 34, 247–253 (2018). https://doi.org/10.1007/s40242-018-7296-x
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DOI: https://doi.org/10.1007/s40242-018-7296-x