Cu-SSZ-39 (at) SSZ-39 core-shell type molecular sieve and preparation method and application thereof
A technology of SSZ-39 and cu-ssz-39, applied in the field of molecular sieve synthesis, can solve the problems of deactivation of molecular sieve catalyst, loss of SCR active sites, destruction of long-range ordered structure of molecular sieve, etc. Deactivation and the effect of improving catalytic performance
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[0046] In the second aspect, the embodiment of the present invention provides a method for preparing the Cu-SSZ-39@SSZ-39 core-shell molecular sieve according to the first aspect, comprising the following steps:
[0047] (1) Preparation of Cu-SSZ-39 molecular sieve synthesis solution:
[0048] Mix silicon source, aluminum source, alkali source, copper source, water and templating agent R and stir evenly to obtain Cu-SSZ-39 molecular sieve synthetic liquid;
[0049] (2) Preparation of SSZ-39 molecular sieve synthesis solution:
[0050] Mix silicon source, aluminum source, alkali source, templating agent R and water and stir evenly to obtain SSZ-39 molecular sieve synthetic liquid;
[0051] (3) Preparation of Cu-SSZ-39@SSZ-39 core-shell molecular sieve:
[0052] Transfer the Cu-SSZ-39 molecular sieve synthetic solution to a high-pressure reaction kettle, first at 120°C~200°C
[0053] Crystallization under low temperature for 0.1h~70h, then transfer the SSZ-39 molecular sieve ...
Embodiment 1
[0083] This example provides a method for preparing a Cu-SSZ-39@SSZ-39 core-shell molecular sieve, the preparation method comprising the following steps:
[0084] (1) Preparation of Cu-SSZ-39 molecular sieve synthesis solution:
[0085] According to the molar ratio 0.2Cu:1SiO 2 : 0.05Al 2 o 3 : 0.4OH - : 21H 2 O: 0.1R material ratio to prepare Cu-SSZ-39 molecular sieve synthesis solution, the copper source in the reaction is copper oxide, the aluminum source and silicon source are commercial ultra-stable Y (USY) molecular sieves, the alkali source is sodium hydroxide, template Agent R is N,N-diethyl-2,6-dimethylpiperidine hydroxide. 0.24g sodium hydroxide (NaOH, purity ≥ 99%wt., 6mmolOH - ) dissolved in 6.68g deionized water (371.11mmolH 2 O), after completely dissolving, add 1.25g of 30% N,N-diethyl-2,6-dimethylpiperidine hydroxide aqueous solution (2mmolR, 48.61mmolH 2 O, 2mmolOH - ), after which 1.35 g SiO was added under rapid stirring 2 / Al 2 o 3 Commercial US...
Embodiment 2
[0093] This example provides a method for preparing a Cu-SSZ-39@SSZ-39 core-shell molecular sieve, the preparation method comprising the following steps:
[0094] (1) Preparation of Cu-SSZ-39 molecular sieve synthetic liquid: it is basically the same as step (1) in Example 1, except that the Cu-SSZ-39 molecular sieve synthetic liquid is directly obtained without aging operation.
[0095] (2) Preparation of SSZ-39 molecular sieve synthetic liquid: it is basically the same as step (2) of Example 1, except that the SSZ-39 molecular sieve synthetic liquid is directly obtained without aging operation.
[0096] (3) Preparation of Cu-SSZ-39@SSZ-39 core-shell molecular sieve: It is exactly the same as step (3) of Example 1.
[0097] The X-ray diffraction (XRD) pattern of described Cu-SSZ-39@SSZ-39 core-shell type molecular sieve is as follows figure 2 As shown, the X-ray diffraction (XRD) test is consistent with the AEI structure molecular sieve (SSZ-39) data in the International Ze...
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