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SSZ-13 molecular sieve and preparation method thereof

A molecular sieve, ion exchanger technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of unsatisfactory thermal stability and hydrothermal stability, low density of strong acid centers, easy loss of acid centers, etc., to improve ion migration ability, high hydrothermal stability, the effect of increasing the crystallization rate

Active Publication Date: 2018-06-22
REZEL CATALYSTS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the molecular sieve NH3-TPD synthesized by this method has a strong acid center density lower than 0.2mmol / g, a low density of strong acid centers, and few active centers. Under the complex working conditions of SCR, the acid centers are easily lost, and are thermally stable and hydrothermally stable. Sex is not ideal

Method used

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  • SSZ-13 molecular sieve and preparation method thereof
  • SSZ-13 molecular sieve and preparation method thereof
  • SSZ-13 molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation and application of comparative samples:

[0036] 1) Gel synthesis: Add 1688 grams of 20% N,N,N-trimethyladamantyl ammonium hydroxide (template agent R2) into a beaker, and stir in a water bath at 25°C for 40 minutes. Add 560 grams of potassium hydroxide with a mass fraction of 25%, and then add 533.3 grams of sodium hydroxide with a mass fraction of 30%, and continue stirring. Add 1714.3 mass fraction of 35% alkaline silica sol, and stir for 80 min. Then add 266.56 grams of aluminum sulfate and 3098.4 grams of water to prepare the aqueous solution. Stir at 30°C for 6 hours to obtain a gel. Then ultrasonically disperse the gel in an ultrasonic cleaning machine for 20 minutes to prepare a uniform gel;

[0037] The molar ratio of the reaction materials is: SiO2 :Al 2 o 3 :K 2 O:Na 2 O:R2:H 2 O=1:0.04:0.1:0.2:0.2:35;

[0038] 2) High-temperature hydrothermal reaction: Transfer the homogeneous gel to a hydrothermal reaction kettle at 160°C, with a stirri...

Embodiment 2

[0042] 1) Gel synthesis: Dissolve 93.85 grams of amantadine hydrochloride (template agent R1) and 171.4 grams of barium hydroxide into 1356.2 grams of water, stir in a water bath at 20°C for 40 minutes, add 351.6 grams of 30% N, N, N- Trimethyladamantyl ammonium hydroxide (template agent R2), continue to stir. Add 560 grams of potassium hydroxide with a mass fraction of 20%, and then add 266.7 grams of sodium hydroxide with a mass fraction of 30%, and continue stirring. Add 1500 g of alkaline silica sol with a mass fraction of 40%, and stir for 100 min. Add the aqueous solution that the aluminum sulfate of 266.6 grams and 1362.9 grams of water are mixed with again. Stir at 20°C for 7 hours to obtain a gel. Then ultrasonically disperse the gel in an ultrasonic cleaning machine for 20 minutes to prepare a uniform gel;

[0043] The molar ratio of the reaction materials is: SiO 2 :Al 2 o 3 :K 2 O:Na 2 O:BaO:R 1 :R 2 :H 2 O=1:0.04:0.1:0.1:0.1:0.05:0.05:25;

[0044] 2) H...

Embodiment 3

[0048] 1) Gel synthesis: Dissolve 18.77 g of amantadine hydrochloride (template agent R1) and 102.8 g of barium hydroxide into 1454.6 g of water, stir in a water bath at 40°C for 30 min, add 253.2 g of 25% N, N, N-tri Methyladamantyl ammonium hydroxide (template agent R2), continue to stir. Add 746.7 grams of potassium hydroxide with a mass fraction of 30%, and then add 800 grams of sodium hydroxide with a mass fraction of 20%, and continue stirring. Add 1200 g of alkaline silica sol with a mass fraction of 50%, and stir for 120 min. Add the aqueous solution that the aluminum sulfate of 166.6 grams and 1992.8 grams of water are mixed with again. Stir at 40°C for 4 hours to obtain a gel. Then the gel was ultrasonically dispersed in an ultrasonic cleaning machine for 10 minutes to prepare a uniform gel;

[0049] The molar ratio of the reaction materials is: SiO 2 :Al 2 o 3 :K 2 O:Na 2 O:BaO:R 1 :R 2 :H 2 O=1:0.025:0.2:0.2:0.06:0.01:0.03:30;

[0050] 2) High-temperatu...

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Abstract

The invention relates to a preparation method of an SSZ-13 molecular sieve. The preparation method comprises the following steps: 1) dissolving template agents, namely, amantadine hydrochloride and barium hydroxide in water, and adding the template agent N, N, N-trimethyl-1-ammonium adamantane for stirring and mixing, adding a strong alkali solution for stirring and mixing, and adding silica sol for stirring and mixing to obtain a mixed solution A; 2) dissolving an aluminum source in water to prepare an aluminum source solution, adding the aluminum source solution to the mixed solution A prepared in the step 1), and performing stirring to prepare a mixed solution B; 3) crystallizing the mixed solution B, and performing suction filtering, washing, drying and roasting to obtain a molecular sieve sample; 4) adding the molecular sieve sample to an ion exchanger aqueous solution for ion exchange, performing suction filtration, washing and drying, and repeating ion exchange, suction filtration, washing, drying and roasting to obtain the SSZ-13 molecular sieve. The SSZ-13 molecular sieve is synthesized with a composite template agent method, nontoxic amantadine hydrochloride is used as asecond template agent, and the preparation method is safe and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a SSZ-13 molecular sieve and a preparation method thereof. Background technique [0002] SSZ-13 molecular sieve is a silica-alumina zeolite molecular sieve with chabazite (CHA) structure, which is made of AlO 4 and SiO 4 The tetrahedra are connected end to end through oxygen atoms, and are arranged in an orderly manner into an ellipsoidal cage with an eight-membered ring structure and a three-dimensional intersecting channel structure, and the window diameter is 0.38nm. Because SSZ-13 molecular sieve has the characteristics of ordered pore structure, suitable surface proton acid centers and high specific surface area, SSZ-13 molecular sieve has a wide range of applications in the fields of automobile exhaust catalysts (such as SCR), carbon dioxide separation, and methanol-to-olefin catalysts. application. [0003] SSZ-13 molecular sieve was invented by U.S....

Claims

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Application Information

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IPC IPC(8): C01B39/04
CPCC01B39/04C01P2006/12C01P2006/32
Inventor 黄小东卓润生王旺阳
Owner REZEL CATALYSTS CORP
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