Method for synthesizing TS-1 molecular screen
A synthesis method and technology of molecular sieves, applied in the direction of molecular sieve compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as unstable performance, poor repeatability, and large difference in TS-1 quality, and achieve catalytic oxidation activity and selectivity improvement , reduce the cost of synthesis, reduce the effect of dosage
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Embodiment 1
[0041] First mix the tetraethyl orthosilicate and tetrabutyl titanate uniformly, then add them to the aqueous solution of tetrapropylammonium hydroxide and stir and mix uniformly. Among them, tetraethyl orthosilicate, tetrabutyl titanate, tetrapropyl The molar ratio of ammonium hydroxide to water is 1:0.04:0.1:15, and hydrolysis is carried out under normal pressure and 40°C under ultrasonic stirring for 2 hours to obtain a titanium and silicon hydrolysis solution. Put the titanium and silicon hydrolyzate into a stainless steel sealed reactor, crystallize it at 170°C and autogenous pressure for 24 hours, filter the resulting crystallized product, wash it with water, and dry it at 110°C for 120 minutes, and then heat it at 550°C. It is calcined at a temperature of ℃ for 3 hours to obtain TS-1 molecular sieve. The yield is about 92%. Its XRD phase diagram is as follows figure 1 As shown in (B), it is similar to the comparative example; the Fourier infrared spectrum is as shown in fi...
Embodiment 2
[0043] Mix tetraethyl orthosilicate and tetrabutyl titanate uniformly and add them to the aqueous solution of tetrapropylammonium hydroxide by ultrasonic stirring and mix uniformly to obtain a hydrolysis solution of titanium and silicon. Among them, tetraethyl orthosilicate and tetrabutyl titanate The molar ratio of ester, tetrapropylammonium hydroxide and water is 1:0.1:0.15:75. Put the titanium and silicon hydrolysate into a stainless steel sealed reactor, and crystallize it at a temperature of 150°C and autogenous pressure for 96 hours. The obtained crystallized product was filtered, washed with water, dried at 110°C for 120 minutes, and then calcined at 550°C for 3 hours to obtain TS-1 molecular sieve. The yield is about 90%. Its XRD phase diagram is as follows figure 1 As shown in (C), it is similar to the comparative example; the Fourier infrared spectrum is shown as figure 2 As shown in (c), similar to the comparative example, the infrared spectrum is at 960 cm -1 There i...
Embodiment 3
[0045] Mix tetraethylorthosilicate and tetrabutyl titanate uniformly, then add them to the aqueous solution of tetrapropylammonium hydroxide and triethanolamine, and stir and mix uniformly to obtain titanium and silicon hydrolysis solution. Among them, tetraethylorthosilicate, titanium The molar ratio of tetrabutyl phosphate, tetrapropylammonium hydroxide, triethanolamine and water is 1:0.05:0.15:0.15:35. Put this titanium and silicon hydrolyzate into a stainless steel sealed reactor, and set it at a temperature of 170℃ and The crystallized product was crystallized under autogenous pressure for 48 hours, and the obtained crystallized product was filtered, washed with water, dried at 110°C for 120 minutes, and then calcined at 550°C for 3 hours to obtain the product. The yield is about 89%. X-ray diffraction (XRD) and infrared spectroscopy (IR) characterization proved that the obtained sample is TS-1 molecular sieve, and its ultraviolet-visible spectrum has a strong absorption band...
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