Preparation method of simultaneous desulfurization and denitration adsorbent of molecular sieve/alumina core-shell structure
A core-shell structure, desulfurization and denitrification technology, applied in separation methods, chemical instruments and methods, alkali metal oxides/hydroxides, etc. Effect
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Embodiment 1
[0018] a) 15g of aluminum sulfate is configured into an aqueous solution with a mass fraction of 10%, the reaction temperature is controlled at 30°C, and 20% ammonia water is added dropwise under conditions of ultrasonic and vigorous stirring until the pH of the solution is 9, at 2000r / min centrifuged at a high speed, and washed with deionized water several times to remove acid radicals, to obtain a solid for later use.
[0019] b) Add 500 mL of water to the above solid, activate it at 80° C. for 4 hours, centrifuge at a speed of 2500 r / min, and wash it with absolute ethanol to remove water. The resulting solid was used for later use.
[0020] c) Mix the solid, 1.2g ZSM-5 molecular sieve, 120mL of absolute ethanol and 1.5g of CTAB, stir well, dry at 90°C for 12 hours, and finally bake at 800°C for 5 hours to obtain the core-shell structure Adsorbent A.
Embodiment 2
[0022] a) 12g of aluminum nitrate is configured into an aqueous solution with a mass fraction of 12%, the reaction temperature is controlled at 40°C, and 25% ammonia water is added dropwise under conditions of ultrasonic and vigorous stirring until the pH of the solution is 8, at 1400r / min centrifuged at a high speed, and washed with deionized water several times to remove acid radicals, to obtain a solid for later use.
[0023] b) Add 450 mL of water to the above solid, activate it at 90° C. for 2 hours, centrifuge at 800 r / min, wash with absolute ethanol to remove water. The resulting solid was used for later use.
[0024] c) Mix the solid, 2.0g SAPO-34 molecular sieve, 100mL of absolute ethanol and 1.2g of PVA, stir well, dry at 100°C for 10 hours, and finally roast at 900°C for 6 hours to obtain the core-shell structure Adsorbent B.
Embodiment 3
[0026] a) 8g aluminum chloride is configured into an aqueous solution with a mass fraction of 8%, and the controlled reaction temperature is 50° C., and 28% ammonia water is added dropwise under conditions of ultrasound and vigorous stirring until the pH value of the solution is 10. Centrifuge at a speed of 1 min, wash with deionized water several times to remove acid radicals, and obtain a solid for future use.
[0027] b) Add 600 mL of water to the above solid and then activate it at 70° C. for 5 hours, centrifuge at a speed of 1000 r / min, wash with absolute ethanol to remove water. The resulting solid was used for later use.
[0028] c) Mix the solid, 1.8g zeolite molecular sieve, 80mL of absolute ethanol and 3g of urea, mix well, dry at 120°C for 11 hours, and finally roast at 1000°C for 3 hours to obtain the core-shell structure adsorbent C .
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