Lamellar titanium silicalite molecular sieve TS-1 as well as preparation method and application thereof
A titanium-silicon molecular sieve, TS-1 technology, applied in crystalline aluminosilicate zeolite, organic chemistry, etc., can solve the problems of cumbersome steps, high production cost and complicated process of sheet MFI molecular sieve, and achieve high conversion rate of hydrogen peroxide, High selectivity, the effect of increasing the titanium content of the skeleton
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Embodiment 1
[0041] The preparation of embodiment 1 sample TS-1-1
[0042] First, as shown in Table 1, the molar ratio of SiO 2 :0.03TiO 2 :0.25R:0.05M:40H 2 O Calculate the amount of each raw material required. Tetrapropylammonium hydroxide was added into deionized water, stirred and dissolved to obtain a mixed solution. Add tetraethyl orthosilicate to the above mixed solution, stir at 40°C for 4h; then add isopropyl titanate, and stir at 50°C for 3h; add crystallization aid sodium persulfate into solution and add to the above mixing The solution was stirred at 50° C. for 0.5 h; then the above mixed solution was transferred to a high-pressure crystallization reactor, and statically crystallized at 180° C. for 36 h. The obtained product is centrifuged, washed, dried and calcined to finally obtain the titanium-silicon molecular sieve TS-1-1.
Embodiment 2
[0043] The preparation of embodiment 2 sample TS-1-2
[0044] First, as shown in Table 1, the molar ratio of SiO 2 :0.03TiO 2 :0.25R:0.1M:40H 2 O Calculate the amount of each raw material required. Tetrapropylammonium hydroxide was added into deionized water, stirred and dissolved to obtain a mixed solution. Add tetraethyl orthosilicate to the above mixed solution, stir at 40°C for 4h; then add isopropyl titanate, and stir at 50°C for 3h; add crystallization aid sodium persulfate into solution and add to the above mixing The solution was stirred at 50° C. for 0.5 minutes; then the above mixed solution was transferred to a high-pressure crystallization reactor, and statically crystallized at 150° C. for 72 hours. The obtained product is centrifuged, washed, dried and calcined to finally obtain the titanium-silicon molecular sieve TS-1-2.
Embodiment 3
[0045] The preparation of embodiment 3 sample TS-1-3
[0046] First, as shown in Table 1, the molar ratio of SiO 2 :0.03TiO 2 :0.25R:0.15M:40H 2 O Calculate the amount of each raw material required. Tetrapropylammonium hydroxide was added into deionized water, stirred and dissolved to obtain a mixed solution. Add tetraethyl orthosilicate to the above mixed solution, stir at 40°C for 4h; then add isopropyl titanate, and stir at 50°C for 3h; add crystallization aid sodium persulfate into solution and add to the above mixing The solution was stirred at 50° C. for 0.5 h; then the above mixed solution was transferred to a high-pressure crystallization reactor, and statically crystallized at 200° C. for 24 h. The obtained product is centrifuged, washed, dried and calcined to finally obtain the titanium-silicon molecular sieve TS-1-3.
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