Method for fabricating titanium-containing silicon oxide material and application of the same
A method for fabricating a titanium-containing silicon oxide material and an application of the same are disclosed. The method needn't use a template but directly use an amorphous silicon dioxide and a titanium source as the reactants. The reactants are mixed with a solvent and react in the solvent. The suspension generated by the reaction is processed by solid-liquid separation, flushing and drying to obtain a titanium-containing silicon oxide material. The method features a simplified fabrication process and a low fabrication cost. The titanium-containing silicon oxide material fabricated by the method has a superior catalytic activity, able to catalyze an epoxidation reaction of an olefin-group compound to generate an epoxide.
1. A method for fabricating a titanium-containing silicon oxide material, comprising steps:
preparing a mixture liquid containing an amorphous silicon dioxide, a titanium source and a solvent;
enabling a reaction of said mixture liquid without using a template, and undertaking a solid-liquid separation process; and
drying a solid-state material obtained in said solid-liquid separation process to obtain a titanium-containing silicon oxide material, wherein in an anhydrous state, said titanium-containing silicon oxide material is expressed by Formula (I):
x TiO 2 (1− x )SiO 2 (I)
wherein x is a number within 0.002-0.2.
2. The method according to claim 1 , wherein said amorphous silicon dioxide is smoked silica, fumed silica, silica gel, or silica sol; said titanium source is a titanate or an inorganic titanium source; said solvent is an alcohol-group compound.
3. The method according to claim 2 , wherein said titanate is selected from a group consisting of tetramethyl titanate, tetraethyl titanate, tetrapropyl orthotitanate, tetra isopropyl titanate, tetrabutyl orthotitanate, tetra sec-butyl titanate, tetrabutyl isotitanate, tetra tert-butyl titanate, and combinations thereof; said inorganic titanium source is titanium trichloride or titanium tetrachloride; said solvent is selected from a group consisting of methyl alcohol, ethyl alcohol, isopropyl alcohol, butyl alcohol, and tert-butyl alcohol.
4. The method according to claim 1 , wherein a molar ratio of titanium to silicon ranges from 0.002 to 0.2.
5. The method according to claim 4 , wherein a molar ratio of titanium to silicon ranges from 0.01 to 0.1.
6. The method according to claim 1 , wherein said reaction of said mixture liquid is undertaken at a temperature of 20-100° C. for 0.5-3 hours; said solid-state material obtained in said solid-liquid separation process is persistently dried at a temperature of 30-120° C. for 0.5-6 hours.
7. The method according to claim 1 further comprising at least one of following steps:
calcining said titanium-containing silicon oxide material at a temperature of 300-800° C. for 1-9 hours;
silylating said titanium-containing silicon oxide material at a temperature of 25-200° C. for 0.5-3 hours; and
incorporating a transition metal into said titanium-containing silicon oxide material, wherein a concentration of said transition metal in said titanium-containing silicon oxide material is within 0.01-10 wt %.
8. The method according to claim 7 , wherein said concentration of said transition metal in said titanium-containing silicon oxide material is within 0.05-5 wt %.
9. A method for fabricating an epoxide, comprising a steps:
providing said titanium-containing silicon oxide material fabricated according to claim 1 as a catalyst to enable a reaction of an olefin-group compound and an oxide to form an epoxide.
10. The method according to claim 9 , wherein said olefin-group compound is a mono-olefin compound, a di-olefin compound, or a poly-olefin compound; said oxide is an organic peroxide or a hydroperoxide.
11. The method according to claim 10 , wherein said mono-olefin compound is selected from a group consisting of ethylene, propylene, 1-butene, isobutene, 1-hexene, 2-hexene, 3-hexene, 1-octene, 1-decene, styrene, and cyclohexene; said di-olefin compound is butadiene or isoprene; said organic peroxide is ethylbenzene hydroperoxide, cumene hydroperoxide, tertiary butyl hydroperoxide, or cyclohexyl hydroperoxide.
12. The method according to claim 9 , wherein a molar ratio of said olefin-group compound to said oxide ranges from 1:100 to 100:1.
13. The method according to claim 12 , wherein said molar ratio of said olefin-group compound to said oxide ranges from 1:10 to 10:1.
14. The method according to claim 9 , wherein said reaction of said olefin-group compound and said oxide is undertaken for 1 minute-48 hours at a temperature of 0-200° C. and at a pressure of 1-100 atm.
15. The method according to claim 14 , wherein said reaction of said olefin-group compound and said oxide is undertaken for 5 minute-8 hours at a temperature of 25-150° C. and at a pressure of 1-100 atm.