Nano ZSM-5 molecular sieve based catalyst and preparation and use methods
A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of improving the overall aromatics selectivity, wide range of applicable raw materials, and reducing the production rate
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Embodiment 1
[0030] Embodiment 1: the preparation method of molecular sieve catalyst comprises the following steps:
[0031] Step 1: 2g of silica sol, 0.02g of aluminum nitrate, 0.36g of TPAOH (25% aqueous solution), 2g of urea, 0.1g of isopropanol, 18g of water were mixed and stirred at room temperature to form a precursor aqueous solution, and then the precursor aqueous solution was transferred to Put it into a synthesis kettle, seal it, and crystallize it at 120°C for 72h. After the crystallization, separate the reaction mixture from solid to liquid, wash it with deionized water, dry the solid at 90°C for 3h, and finally bake it in an air atmosphere at 450°C for 1h. , to obtain molecular sieve raw powder, the raw powder particle size is 1 ~ 2 μm × 500nm ~ 1 μm × 3 ~ 3.5 μm ([100] direction (a axis) × [010] direction (b axis) × [001] direction (c axis) );
[0032] Step 2: Mix and stir the molecular sieve powder with 20 mL of 0.1 mol / L ammonium salt solution for 1 h, filter, and mix the ...
Embodiment 2
[0035] Embodiment 2: the preparation method of molecular sieve catalyst comprises the following steps:
[0036] Step 1: 21g of silica sol, 3.6g of aluminum nitrate, 32.4g of TPAOH (25% aqueous solution), 17g of urea, 9g of isopropanol, 18g of water, mixed and stirred at room temperature to form a precursor aqueous solution, and then the precursor aqueous solution was transferred to In the synthesis kettle, seal it, and crystallize it at 120°C for 72h. After the crystallization, separate the reaction mixture from solid to liquid, wash it with deionized water, dry the solid at 90°C for 3h, and finally bake it in an air atmosphere at 650°C for 10h. Get molecular sieve raw powder, raw powder particle size is 1~2μm×500nm~1μm×3~3.5μm ([100] direction (a axis)×[010] direction (b axis)×[001] direction (c axis)) ;
[0037] Step 2: Mix and stir the molecular sieve raw powder with 20 mL of 0.1mol / L ammonium salt solution for 24 hours, filter, and mix and stir the filter cake with 0.1mol...
Embodiment 3
[0040] Embodiment 3: the preparation method of molecular sieve catalyst comprises the following steps:
[0041] Step 1: Mix and stir 11g TEOS, 0.3g aluminum nitrate, 18g TPAOH,,, 2g urea, 0.2g KOH, and 18g water at room temperature to prepare a precursor aqueous solution, then transfer the precursor aqueous solution into a synthesis kettle, seal it, Crystallize at 180°C for 48h. After crystallization, the reaction mixture is separated from solid and liquid, washed with deionized water, dried at 90°C for 24h, and finally calcined in an air atmosphere at 550°C for 10h to obtain a molecular sieve powder with a size of 400~500nm×150nm~200nm×2μm~2.5μm ([100] direction (a axis)×[010] direction (b axis)×[001] direction (c axis)).
[0042] Step 2: Mix and stir the molecular sieve raw powder with 20 mL of 0.1mol / L ammonium salt solution for 24 hours, filter, and mix and stir the filter cake with 0.1mol / L ammonium salt solution for 24 hours again, filter, and repeat this 5 times, at 100...
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