A kind of ZSM-48 molecular sieve and its preparation method and application
A molecular sieve and alumina technology, which is applied in the field of molecular sieve materials, can solve the problems of weakened acidity of molecular sieve, lack of structure of mesopores, and reduced interaction.
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[0028] The invention also provides a preparation method of the ZSM-48 molecular sieve. Generally, the preparation of aluminum-containing molecular sieves can be divided into steps such as gelation, crystallization, and post-treatment. In order to obtain the ZSM-48 molecular sieve of the present invention, the post-treatment step in the synthesis process of the aluminum-containing molecular sieve needs to be specially treated, and the specific steps are as follows:
[0029] (1) filtering the crystallized mother liquor to form a filter cake with a dry basis content of 5-30% by weight;
[0030] (2) directly roasting the filter cake to obtain a molecular sieve precursor;
[0031] (3) subjecting the molecular sieve precursor to hydrothermal treatment;
[0032] (4) Filtrating, washing and drying the hydrothermally treated product.
[0033] In step (1), the purpose of filtering the crystallized mother liquor is to remove the synthesis mother liquor. The present invention specific...
Embodiment 1
[0051] (1) Preparation of mother liquor after crystallization
[0052] Get 45 grams of white carbon black, 1.25 grams of analytically pure Al 2 (SO 4 ) 3 18H 2 O, 1.88 grams of analytically pure NaOH and 39.3 grams of hexamethylenediamine are ready for use. Mix hexamethylenediamine with silica and 200 g of deionized water, NaOH and Al 2 (SO 4 ) 3 18H 2 O and 272 grams of deionized water were mixed, and then the two solutions were mixed, stirred for 1 hour, then transferred to a reaction kettle, and crystallized at 160° C. for 72 hours.
[0053] (2) Preparation of filter cake
[0054] Filter the mother liquor after crystallization prepared in the operation (1), and continue suction filtration for 5 minutes when there is no filtrate on the filter cake, and obtain the filter cake F-1, which has a dry basis content of 11.2 %, the silica / alumina molar ratio is 30.2.
[0055] (3) Preparation of molecular sieve precursor
[0056] The filter cake F-1 was raised from room te...
Embodiment 2
[0063] The ZSM-48 molecular sieve was prepared according to the method of Example 1, except that in step (3), the filter cake F-1 was raised from room temperature to 350° C. at a heating rate of 5° C. / min, and kept at a constant temperature for 14 hours. During the heating process, the roasting furnace is a closed roasting furnace to obtain the molecular sieve precursor C-2. The finished product H-2 of ZSM-48 molecular sieve was obtained.
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