Hierarchical pore Y-type molecular sieve, preparation method and application thereof
A molecular sieve and multi-stage pore technology, which is applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve the problems of inability to obtain porous structures, inability to make full use of the structural characteristics of spent catalysts, and low utilization rate of spent MTP catalysts, etc. problem, to achieve the effect of improving the utilization rate
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[0037] The first aspect of the present invention provides a kind of preparation method of hierarchical porous Y-type molecular sieve, comprising the following steps:
[0038] (1) Roasting the spent MTP catalyst;
[0039] (2) Mix the product obtained in step (1) with sodium hydroxide solution, and microwave heat treatment in a closed container to obtain the mixed solution I;
[0040] (3) Mix the mixed liquid I with the silicon source and the Y-type molecular sieve seed crystal, and age to obtain the initial crystallization gel;
[0041] (4) The initial crystallization gel is subjected to hydrothermal crystallization treatment, and then separated, washed and dried to obtain the hierarchically porous Y-type molecular sieve.
[0042] In the present invention, the multi-stage Y-type molecular sieve refers to a Y-type molecular sieve that includes micropores and mesoporous pores. Specifically, the micropores refer to the inherent pores of a Y-type molecular sieve with a pore size o...
Embodiment 1
[0074] Add 8.0 g of sodium hydroxide to 100 g of distilled water (concentration of sodium hydroxide is 2.0 mol / L), stir until completely dissolved, and roast the spent MTP catalyst at 550°C for 5 hours, then take 11 g of the roasted product and add it to the above solution , stir until it is completely dissolved, put it into a pressure bomb with a polytetrafluoroethylene liner, treat it with microwave at 120°C for 10min, and use a microwave power of 1000W. After cooling down to room temperature, transfer it to an Erlenmeyer flask. content is 30% by weight) and 1g of NaY molecular sieves are added as crystal seeds in the above solution and stirred evenly to obtain the initial crystallization gel, and the proportioning ratio of the gel is: NaY 2 O:SiO 2 :Al 2 o 3 :H 2O=3.6:9:1:227.6. Finally, the initial crystallization gel was transferred to a pressure vessel lined with polytetrafluoroethylene, heated from room temperature to 98°C, and then statically crystallized at 98°C f...
Embodiment 2
[0076] Add 10 g of sodium hydroxide to 50 g of distilled water (the concentration of sodium hydroxide is 5.0 mol / L), stir until completely dissolved, and after the spent MTP catalyst is roasted at 550° C. for 5 h, 11.3 g of the roasted product is added to the above solution. Stir until it is completely dissolved, put it into a pressure vessel lined with polytetrafluoroethylene, and treat it with microwave at 120°C for 5 minutes with a microwave power of 1000W. After cooling down to normal temperature, transfer to the Erlenmeyer flask, add 70g of silica sol (silicon dioxide content is 30% by weight) and 1g of NaY molecular sieve seed crystals into the above solution and stir to obtain the initial crystallization gel. Ratio: Na 2 O:SiO 2 :Al 2 o 3 :H 2 O=4.4:17.5:1:192. Finally, the initial crystallization gel was transferred to a pressure vessel lined with polytetrafluoroethylene, heated from room temperature to 98°C, and then statically crystallized at 98°C for 24 hours. ...
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