A TAPO-11 molecular sieve with the space group lcm2 was synthesized successfully. The samples with different space group were controlled simply only by adjusting the crystallization temperature （CT） in the hydrother...A TAPO-11 molecular sieve with the space group lcm2 was synthesized successfully. The samples with different space group were controlled simply only by adjusting the crystallization temperature （CT） in the hydrothermal system. In the system of gel with a molar composition of 0.7R- xTiO2： P2O5： Al2O3： 30H2O, where x is 0.01-0.10 and the R is a mixture of di-n-propylamine and diisopropylamine as templates. When CT was between 150-160℃, the calcined sample showed the space group of Icm^2, while it showed Pna21 at CT larger than 190℃. The characterizations of UV-Vis and FT-IR confirmed that Ti was incorporated into the AEL framework successfully.展开更多
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This work was supported by the National Natural Science Foundation of China （No. 20473027） Science and Technology Commission of Shanghai Municipality （No. 05dz22306）Pujiang project （No. 05PJ14041）.
文摘A TAPO-11 molecular sieve with the space group lcm2 was synthesized successfully. The samples with different space group were controlled simply only by adjusting the crystallization temperature （CT） in the hydrothermal system. In the system of gel with a molar composition of 0.7R- xTiO2： P2O5： Al2O3： 30H2O, where x is 0.01-0.10 and the R is a mixture of di-n-propylamine and diisopropylamine as templates. When CT was between 150-160℃, the calcined sample showed the space group of Icm^2, while it showed Pna21 at CT larger than 190℃. The characterizations of UV-Vis and FT-IR confirmed that Ti was incorporated into the AEL framework successfully.
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.
