A series of fluorine modified TAPO-5 molecular sieves was synthesized by one-pot method using ammo- nittm hexafluorotitanate as titanium and fluorine sources. The XPS and DRS UV-Vis results indicated that the exis- te...A series of fluorine modified TAPO-5 molecular sieves was synthesized by one-pot method using ammo- nittm 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 A1, meanwhile, inhibit the formation of anatase TiO2 in TAPO-5 sieves due to the unique role ofF in the sol-gel process of metal ions. Further- more, TG, contact angle test, Py-FTIR and 27A1 MAS NMR results revealed that fluorine modification increased the surface hydrophobicity and the Lewis acidity of Ti active sites through forming AlxFy units in the neighborhood. All these factors make these fluorine modified TAPO-5 sieves exhibit good catalytic performance in the arnmoximation of cyclohexanone.展开更多
基金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）.
文摘A series of fluorine modified TAPO-5 molecular sieves was synthesized by one-pot method using ammo- nittm 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 A1, meanwhile, inhibit the formation of anatase TiO2 in TAPO-5 sieves due to the unique role ofF in the sol-gel process of metal ions. Further- more, TG, contact angle test, Py-FTIR and 27A1 MAS NMR results revealed that fluorine modification increased the surface hydrophobicity and the Lewis acidity of Ti active sites through forming AlxFy units in the neighborhood. All these factors make these fluorine modified TAPO-5 sieves exhibit good catalytic performance in the arnmoximation of cyclohexanone.
