Method for modifying silicoaluminophosphate molecular sieve, modified molecular sieve and application thereof
A silicoaluminophosphate, molecular sieve technology, applied in molecular sieve catalyst, molecular sieve and alkali exchange phosphate, chemical instruments and methods, etc., can solve the problems of high cost, complicated operation process, etc. Effects of Reaction Stability
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[0032] [Example 1]
[0033] The SAPO-34 molecular sieve with a multi-stage pore structure was prepared, and the raw material was taken from the conventional SAPO-34 molecular sieve A with only micropores prepared according to [Comparative Example 1].
[0034] Weigh 30g of molecular sieve A and place it in a 0.03M acidic solution. The acidic solution is a mixed solution of nitric acid and citric acid. The ratio of the two is 8:1. The amount of the solution is 0.9L. Stir at 75℃ After 3 hours, product B is obtained after filtering, washing, drying and roasting.
[0035] The XRD spectrum of B is as follows figure 1 Shown from figure 1 It can be seen that the synthesized molecular sieve has the characteristic diffraction peaks of SAPO-34 molecular sieve, indicating that the prepared product is pure SAPO-34 molecular sieve with a relative crystallinity of 92%.
[0036] The SEM photo of B is as image 3 As shown, a clear pore structure appeared on the surface of the molecular sieve.
[0037]...
Example Embodiment
[0039] [Example 2]
[0040] The same as [Example 1], except that the raw materials used are the conventional SAPO-34 molecular sieve A with only micropores prepared according to the method of [Comparative Example 1] after calcination. The resulting SAPO-34 molecular sieve with multi-stage pore structure is denoted as C.
[0041] The XRD spectrum of C is as follows figure 1 Shown from figure 1 It can be seen that the prepared molecular sieve has the characteristic diffraction peaks of SAPO-34 molecular sieve, indicating that the prepared product is pure SAPO-34 molecular sieve with a relative crystallinity of 90%.
[0042] C's SEM photo with image 3 similar.
[0043] C The pore size of micropores is distributed in 0.3~0.5nm, the pore diameter of mesopores is distributed in 8~25nm, and the pore diameter of macropores is distributed in 50~250 nm; the pore volume contributed by micropores is 0.19cm 3 / g, the pore volume contributed by mesopores is 0.20cm 3 / g, the pore volume contribute...
Example Embodiment
[0045] [Example 3]
[0046] Same as [Example 1], except that the treatment process is divided into two steps. First, treat in 0.1L of 0.01M nitric acid solution for 1h, after filtering, washing and drying, then treat in 0.8L of 0.03M citric acid solution 2h, the resulting product is marked as D.
[0047] The XRD spectrum of D is as figure 1 Shown from figure 1 It can be seen that the synthesized molecular sieve has the characteristic diffraction peaks of SAPO-34 molecular sieve, indicating that the synthesized product is pure SAPO-34 molecular sieve with a relative crystallinity of 92%.
[0048] D’s SEM photo and image 3 similar.
[0049] D The pore size of micropores is distributed in 0.3~0.5nm, the pore diameter of mesopores is distributed in 5~20nm, and the pore diameter of macropores is distributed in 50~200nm; the pore volume contributed by micropores is 0.20cm 3 / g, the pore volume contributed by mesopores is 0.21cm 3 / g, the pore volume contributed by the macropore is 0.19cm ...
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