Aromatization catalyst as well as preparation method and application thereof
An aromatization and catalyst technology, which is applied in the field of aromatization catalyst and its preparation, can solve the problem that the selectivity of aromatic hydrocarbons needs to be further improved, and achieves the effect of delaying the carbon deposition rate, reducing the influence of diffusion resistance and improving the selectivity.
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[0040] The present invention provides a method for preparing an aromatization catalyst described in the above technical scheme, comprising the following steps:
[0041] (1) adding the silicon source to the mixed aqueous solution including the aluminum source and the directing agent, performing a hydrothermal reaction, and roasting the solid product of the hydrothermal reaction to obtain the ZSM-5 molecular sieve matrix;
[0042] (2) mixing the ZSM-5 molecular sieve parent body, water and directing agent, and roasting the gained solid product after hydrothermal treatment;
[0043] (3) performing alkali treatment on the product obtained by roasting the step (2) to obtain a hierarchically porous ZSM-5 molecular sieve;
[0044] (4) the ZSM-5 molecular sieve of described multi-stage hole is carried out ammonium ion modification, obtains modified ZSM-5 molecular sieve after roasting;
[0045] (5) ion-exchange the modified ZSM-5 molecular sieve with the gallium salt solution, and ob...
Embodiment 1
[0078] (1) Weigh 0.1822g sodium metaaluminate and place it in a beaker, add 38.75g deionized water, 20.336g mass fraction of 25% tetrapropylammonium hydroxide aqueous solution and 0.1g sodium hydroxide, stir until the solution is clear, Then slowly add 20.833g tetraethyl orthosilicate dropwise, and after stirring for 12 hours, transfer the solution into a hydrothermal reaction kettle, crystallize at 170°C for 4 days, remove the mother liquor by centrifugation, wash with deionized water until the solution becomes neutral, Dry overnight at 100°C, and calcine at 600°C for 10 hours to obtain the ZSM-5 molecular sieve precursor;
[0079] (2) Grind the prepared ZSM-5 molecular sieve precursor into powder, weigh 1gZSM-5 molecular sieve precursor (0.4g silicon content), 0.01g sodium hydroxide and 0.002g sodium metaaluminate and disperse them in 5mL water and 3mL of 1mol / L tetrapropylammonium hydroxide solution, stirred for 10 minutes, then transferred to a hydrothermal reaction kettle...
Embodiment 2
[0085] Prepare the aromatization catalyst according to the steps of Example 1, the difference is that the quality of sodium metaaluminate in Example 1 is replaced by 0.3279g, sodium hydroxide is replaced by sodium carbonate, the alkali treatment time is 6h, and other conditions are not changed. Change, the obtained sample is recorded as catalyst 2#.
[0086] The JEM2100-F field emission transmission electron microscope produced by Rigaku Corporation of Japan is used to observe catalyst 2#, and the results are as follows figure 2 shown. figure 2 It is shown that the catalyst has a hierarchical porous structure of micropores, mesopores and macropores, indicating that the molecular sieve synthesized by the present invention is indeed a hierarchical porous structure.
[0087] Carry out BET adsorption on catalyst 2#, the obtained isotherm adsorption curve is as follows image 3 shown. image 3 It shows that the BET specific surface of catalyst 2# is 392m 2 / g, the pore volume...
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