Modified molecular sieve, preparation method, material and use method
A molecular sieve and modification technology, which is applied in the field of processing volatile organic materials, preparation, and modified molecular sieves, can solve the problems of poor stability and complicated preparation methods, and achieve the effects of strong stability, simple preparation process and low cost
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[0041] In view of the technical problems of complex preparation methods and poor stability of molecular sieves in the prior art, the present application provides a new modified molecular sieve, which includes a molecular sieve body and an active ingredient attached to the molecular sieve body, wherein the active ingredient is Super acid, although the existing supported molecular sieves also use super acid as a load, but when it is applied to deal with volatile organic compounds, it does not achieve a good adsorption effect and has a very short life, and the super acid load proposed in this application is. The molecular sieve of the modified molecular sieve has a silicon-alumina molar ratio of 20 to 150, so as to ensure that the molecular sieve body has good hydrophobicity and avoid the modified molecular sieve from adsorbing too much water vapor in the airflow and affecting its service life. The molecular sieve body has a pore structure, and the super acid as an active ingredie...
Embodiment 1
[0074] What this embodiment provides is the preparation method of HY molecular sieve, specifically:
[0075] (1) Preparation of directing agent: 3.8g NaOH, 2.1g NaAlO 2 Put it with 15.2g deionized water in a 100mL beaker and stir until it dissolves completely. Weigh 21.5g of water glass and mix it with the above solution, stir with the rotor magnetically, and stir and age at 25°C for 24h.
[0076] (2) Mother liquor preparation: mix 110g of water glass and the above-mentioned guiding agent, stir rapidly (magnetic rotor stirring), weigh 85.4g of water and 10.7g of sodium aluminate, stir and dissolve completely at room temperature, pour into the above solution, and stir rapidly for 20min , the mixed solution was divided into two hydrothermal synthesis reactors, crystallized at 100°C for 16h, filtered, washed and dried at 80°C to obtain NaY powder product.
[0077] (3) Modification: mix 15.0g NaY molecular sieve and 150mL HNO with a concentration of 0.4moL / L 3 The solution was p...
Embodiment 2
[0079] What this embodiment provides is the preparation method of the modified molecular sieve using the HY molecular sieve obtained in Example 1 as the molecular sieve body, specifically:
[0080] Dissolve 0.25g sodium permanganate in a mixed solvent of 125mL absolute ethanol and water (the volume ratio of water and ethanol is 1:4), add 5g of the HY molecular sieve in Example 1 to the solution, heat and stir for about 1 hour. Next, the solution was filtered, dried, and then calcined at 550°C for 3 hours. 100 mL of ammonium sulfate aqueous solution with a concentration of 10 wt % was taken, and the calcined sample was added to the solution, followed by stirring at room temperature for about 8 hours. Next, filter and dry the solution, and then calcinate at 550°C for 3 hours to obtain a modified molecular sieve of MnO 2 ·H 2 SO 4 Supported HY molecular sieve.
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Abstract
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