Method for preparing L-zeolite by in-situ crystallization
A technology of in-situ crystallization and zeolite, applied in the direction of crystalline aluminosilicate zeolite, L-type crystalline aluminosilicate zeolite, etc., can solve problems such as difficult to control accurately
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Embodiment 1
[0020] Get 140 grams (dry basis) of industrial coarse-porous silica gel, 10 grams of sage powder and join 200 grams of acidic silica sol (SiO 2 content 30%), stir evenly, add ammonia water to adjust the pH value to 6, knead on the kneader for 15 minutes, extrude on the extruder, cut into strips after health preservation and drying, the diameter of the strips is 2 to 3 mm, and the length is 3 mm. ~6 mm. This bar is named T1. T1 was fired at 450°C for 5 hours, 750°C for 2 hours and 850°C for 1 hour to obtain preforms T1-450, T1-750 and T1-850.
Embodiment 2
[0022] Get 180 grams (dry basis) of white carbon black, 10 grams of L zeolite (dry basis) and join in 200 grams of alkaline silica sol (SiO 2 content 30%), stir evenly, add nitric acid to adjust the pH value to 8, knead on the kneader for 15 minutes, extrude on the extruder, cut into strips after curing and drying, the diameter of the strips is 2 to 3 mm, and the length is 3 mm. ~6 mm. This bar is named T2. T2 was fired at 550°C for 6 hours and 650°C for 4 hours to obtain preforms T2-550 and T2-650.
Embodiment 3
[0024] Get 10 grams of sodium aluminate (analytically pure, Al 2 o 3 content 45%), 10.3 grams of potassium hydroxide (analytically pure, KOH content 96%), added to 23.8 grams of deionized water, dissolved transparently, added 10 grams of preform T1-750, stirred evenly, and transferred to the autoclave , crystallized at 170°C for 10 hours after sealing. The product was filtered, washed, and dried. XRD analysis showed that the product was a pure phase L zeolite. In this embodiment, the weight ratio of the crystallization liquid to the preform is 4.4, and in the crystallization liquid, KOH / Al 2 o 3 (molar ratio) is 4, H 2 O / Al 2 o 3 (Molar ratio) was 30.
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