Post-treatment method for molecular sieve modification
A molecular sieve and modification technology, which is applied in the direction of molecular sieve characteristic silicoaluminophosphate, molecular sieve catalyst, molecular sieve and base exchange compound, etc., can solve problems such as acid loss, uneven distribution of mesopores, collapse of molecular sieve crystal structure, etc., and achieve improved selection The modification method is simple and convenient, and the effect of improving the diffusion rate
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[0022] Example 1
[0023] Preparation of pre-treated beta molecular sieve: Beta primary powder and pyridine are mixed, both of the mass ratio of 1: 20, Beta primary powder pyridine soaking time is 12 h, soaked in molecular sieve filtration or from the end of molecular sieve powder, and wash with distilled water Remove the physical adsorbed pyridine molecule; after washing, further dry, the drying temperature is 150 ° C, the drying time is 2 h; the last tube furnace is high temperature carbonization, the carbonization temperature is 700 ° C, the carbonization time is 2 h.
[0024] The pre-treated BETA molecular sieve with the sodium hydroxide solution (0.4 mol / L) was mixed into the three flask in 1:20, and the mixture solution was added to 70 under the conditions of the microwave power of 600 W, magnetic stirring. The heating base was heated at ° C for 2 h, and the resulting product was washed and filtered by deionized water, and then dried at 100 ° C for 5 hours, and 5 h was car...
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[0034] Example 2
[0035] Preparation of pre-treated SAPO-11 molecular sieve: Exploring SAPO-11 primary powder first, 100 ° C for 8 h; after mixing with dimethylpyridine, the mass ratio is 1: 5, SAPO-11 original The powder is soaked in dimethylpyridine; the molecular sieve filtration or from the molecular sieve is filtered or removed from the molecular sieve powder, and the physical adsorbed pyridine molecule is removed; after washing, further drying, drying temperature is 100 ° C, drying time 12h; the last tubular furnace is high temperature carbonization, the carbonization temperature is 300 ° C, the carbonization time is 8 h.
[0036] Pre-treatment SAPO-11 molecular sieves and tetrapropyl hydroxide (0.1 mol / L) were added to the three flasks after mixing from 1: 5, and the microwave power was 600W, magnetic stirring conditions Next, the mixture solution was heated at 90 ° C for 1 h, and the resulting product was carried out multiple times and filtered with deionized water, and...
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[0037] Example 3
[0038] Preparation of the pretreated wire zeolite molecular sieve: first degassing of the silk zeolite powder induced by deprotecting, 400 ° C for 1 h; after mixing with aniline, the mass ratio of 1:30, the moietter zeolite raw phenantine is soaked for 24h The molecular sieve filtration or centrifugation after soaking is filtered or removed by distillation water; after washing, further drying, the drying temperature is 120 ° C, the drying time is 1 h; the last tube furnace is high temperature carbonization, carbonization The temperature was 1000 ° C, the carbonization time was 1 h.
[0039] The pre-treated silk zeolite molecular sieve is mixed with the potassium hydroxide solution (6 mol / L) in mass than 1:20, and the mixture solution is 50 ° C in the case of magnetic stirring is 600 W, magnetic stirring. The lower heating alkali was taken for 12 h, and the obtained product was washed and filtered with deionized water, and then dried at 120 ° C for 4 h at 600 °...
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