Card-house-like MFI molecular sieve with high stability and preparation method and application thereof
A high-stability, molecular sieve technology, applied in the direction of molecular sieves and base exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of wide pore size distribution, reduced catalyst service life, small mesopore diameter, etc., and achieve good structural stability properties, increased structural stability, and good catalytic performance
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Embodiment 1
[0041] 1. Preparation of sheet MFI molecular sieves
[0042] With 0.04mol SiO 2As a benchmark, NaOH, NaAlO 2 , template agent (tetraammonium base head Bola type surfactant C 6-6-12 Br 4 ) and tetraethyl orthosilicate were dissolved in water, and magnetically stirred at 600rpm at room temperature for 30min to obtain a precursor solution with a molar ratio of 16.28Na 2 O:125SiO 2 :2.0Al 2 o 3 :5C 6-6-12 Br 4 :5000H 2 O: Transfer the precursor solution A to a reaction kettle for crystallization at 150°C for 7 days, filter the reactant, collect the filter residue and dry it in a vacuum oven at 120°C for 10 hours to obtain a sheet MFI molecular sieve.
[0043] The above-mentioned preparation process specifically refers to the following documents:
[0044] B. Liu, Q. Duan, C. Li et al. Template synthesis of the hierarchically structured MFI zeolite with nanosheet frameworks and tailored structure.
[0045] 2. Preparation of hierarchically porous MFI molecular sieves
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Embodiment 2
[0053] The difference between this embodiment and embodiment 1 is:
[0054] 1) In step 2.1, the mass ratio of the sheet MFI molecular sieve to the propping agent is 2g:10g; the stirring time is 11h;
[0055] 2) In step 2.2, the heat treatment temperature is 40°C and the time is 10h;
[0056] 3) In step 2.3, the mass ratio of pillared MFI molecular sieve to distilled water is 2g:15g, the hydrothermal reaction temperature is 90°C, and the time is 10h;
[0057] 4) In step 2.4, the drying temperature is 100° C. and the time is 12 hours; the calcination temperature is 550° C. and the time is 5 hours.
[0058] Other places are basically the same as those in Embodiment 1, and will not be repeated here.
Embodiment 3
[0060] The difference between this embodiment and embodiment 1 is:
[0061] 1) In step 2.1, the mass ratio of the sheet MFI molecular sieve to the proppant is 2g:12g; the stirring time is 12h;
[0062] 2) In step 2.2, the heat treatment temperature is 50°C and the time is 8hh;
[0063] 3) In step 2.3, the mass ratio of pillared MFI molecular sieve to distilled water is 2g:20g, the hydrothermal reaction temperature is 80°C, and the time is 11h;
[0064] 4) In step 2.4, the drying temperature is 110°C and the time is 11 hours; the calcination temperature is 550°C and the time is 5 hours;
[0065] 5) In step 3, NH 4 NO 3 The solution concentration is 2mol / L, multi-level porous MFI molecular sieve and NH 4 NO 3 The mixing mass ratio of the solution is 1:10.
[0066] Other places are basically the same as those in Embodiment 1, and will not be repeated here.
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