Preparation method of TS-2 molecular sieve/nanometer silicon carbide whisker composite catalyst
A nano-silicon carbide, titanium-silicon molecular sieve technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of long reaction time, difficult to avoid, complicated operation process, etc.
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Embodiment 1
[0020] Add a mixture of 50.0 grams of tetraethyl orthosilicate, 22 grams of tetrabutylammonium hydroxide and 1.6 milliliters of 17% (weight) concentration of titanium trichloride solution to a container with a stirring device, stir and mix, and then add nano 50 grams of silicon carbide whiskers; slowly heated to 70° C., kept stirring for 24 hours, and at the same time, oxygen or air was passed into the reaction mixture.
[0021] The obtained reaction mixture was transferred into a stainless steel high-pressure crystallization kettle lined with polytetrafluoroethylene, and the crystallization kettle was sealed, and the temperature was raised to 120° C. within 2 hours, and the temperature was kept constant for 120 hours. Then cool, filter and recover the solid product, wash with water, dry at 120°C, and then calcinate to a temperature of 250°C to obtain TS-2 titanium-silicon molecular sieve / nano-silicon carbide whisker composite catalyst. The molar ratio of each component in the...
Embodiment 2
[0023] According to each step of embodiment 1, just tetrabutyl ammonium hydroxide add-on is 40 grams, and the add-on of 17% (weight) concentration titanium trichloride solution is 0.8 milliliters, and nano-silicon carbide add-on is 100 grams. The heating temperature when passing oxygen or air is 90°C, the stirring and heating time is 36 hours, the crystallization temperature is 200°C, and the crystallization time is 36 hours, so that the molar ratio of each component in the reaction mixture is: SiO2 / TiO2=200 , OH- / SiO2=0.6, H2O / SiO2=60.
Embodiment 3
[0025] According to each step of embodiment 1, just tetrabutyl ammonium hydroxide add-on is 22 grams, and the add-on of 17% (weight) concentration titanium trichloride solution is 4.0 milliliters, nano silicon carbide whisker 150 grams. When feeding oxygen or air, the heating temperature is 80°C, the stirring and heating time is 72 hours, the crystallization temperature is 175°C, and the crystallization time is 96 hours, so that the molar ratio of each component in the reaction mixture is: SiO2 / TiO2= 40, OH / SiO2=0.35, H2O / SiO2=80.
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