SAPO molecular sieve, and preparation method and purpose thereof
A molecular sieve, sheet-like structure technology, applied in molecular sieve and alkali-exchanged phosphate, molecular sieve catalyst, molecular sieve characteristic silicoaluminophosphate, etc., can solve the problems of complex maintenance and operation, large investment, difficult to achieve, etc., to increase utilization efficiency , low energy consumption and improved efficiency
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[0101] As an embodiment of the present invention, the preparation method of the sheet SAPO molecular sieve of the present invention includes the following steps:
[0102] (1) Activated layered aluminosilicate;
[0103] (2) Mix and homogenize the activated layered aluminosilicate, phosphorus source, auxiliary aluminum source, auxiliary silicon source and water to prepare a wet masterbatch; wherein the SiO in the wet masterbatch 2 , Al 2 O 3 , P 2 O 5 , H 2 The molar ratio of O and template agent is (0.01-2): (0.1-1.5): (0.1-1.5): (1-500): (0-10);
[0104] (3) Dry and grind the wet masterbatch to obtain dry masterbatch powder;
[0105] (4) Place the dry masterbatch powder on top of the template agent aqueous solution with a concentration of 0-90w%, heat up to 160-370℃, rely on the vapor of the template agent aqueous solution to distill and crystallize; distill the dry masterbatch powder for crystallization Obtain SAPO molecular sieve raw powder;
[0106] Optionally,
[0107] (5) The raw S...
Example Embodiment
[0113] Example 1
[0114] A preparation method of sheet SAPO molecular sieve includes the following steps:
[0115] (1) Grind Suzhou kaolin (with kaolinite content of 90.5%) to an average particle size of less than 0.3μm to obtain a ground activated powder;
[0116] (2) Take 30.0g of ground activated powder and add it to 200.0g of deionized water, then add 52.0g of 85.0% concentrated phosphoric acid, 16.4g of pseudo-boehmite (78.2% alumina content), 20.0g of morpholine, Stir vigorously to obtain a wet masterbatch; in the wet masterbatch, SiO 2 , Al 2 O 3 , P 2 O 5 , H 2 The molar ratio of O to template is 0.244:0.248:0.226:11.54:0.230;
[0117] (3) The above-mentioned wet masterbatch is evaporated to dryness in an oven at 120°C and ground to an average particle size of less than 50μm to obtain dry masterbatch powder;
[0118] (4) Place 10.0g of the above-mentioned dry masterbatch powder on top of 50mL of 40.0% morpholine aqueous solution, distill and crystallize at 200℃ for 120h, cool,...
Example Embodiment
[0122] Example 2
[0123] A preparation method of flaky SAPO molecular sieve, using Example 1 to prepare the rhombohedral flaky SAPO-34 molecular sieve after distillation crystallization solution, continue to dry masterbatch powder (the same ratio as in Example 1) 10.0g In the upper part of the still, keep the morpholine solution in the lower part of the still not taken away, distill and crystallize at 200°C for 120h, cool, and the solid is the raw powder of rhombohedral or flaky SAPO-34 molecular sieve.
[0124] Place the original molecular sieve powder in a muffle furnace, heat it up to 550°C at 2°C / min in flowing air, keep it for 4h, perform template stripping treatment, and cool to room temperature naturally to obtain rhombohedral sheet SAPO-34 molecular sieve.
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