Lamellar ZSM-5 catalyst, and preparation method and application thereof
A technology of ZSM-5 and catalyst, which is applied in the field of layered ZSM-5 catalyst and its preparation, and can solve problems affecting BTX selectivity, etc.
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[0035] The invention provides a kind of preparation method of layered ZSM-5 catalyst, comprises the following steps:
[0036] A) Silicon source compound, aluminum source compound, template A, template B, structure aid, alkali and water are (1-100): (1-100): (1-50): (1 ~50): (1 ~ 40): (1 ~ 10): (1 ~ 7000) After mixing, let stand to obtain the precursor aqueous solution;
[0037] Described templating agent A is selected from [C 22 h 45 –N + (CH 3 ) 2 –C 6 h 12 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 4 h 9 ]Br 2 and [C 22 h 45 –N + (CH 3 ) 2 –C 6 h 12 –N + (CH 3 ) 2 –C 4 h 9 ]Br 2 one or more of
[0038] The template agent B is selected from one or more of TPAOH, TPABr, CTAB, triethylamine, ethylenediamine and pyrrolidone homologues;
[0039] The precursor aqueous solution is subjected to hydrothermal crystallizatio...
Embodiment 1
[0073] 12.0g ethyl orthosilicate, 4.1g [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , a certain amount of CTAB, 1.1g of aluminum sulfate, and 0.7g of NaOH were mixed together to form a precursor aqueous solution, and left to stand for 24 hours. After separating the solid and liquid from the reaction material, it was dried at 110°C for 10 hours, and then roasted at 600°C for 6 hours to obtain the initial product; The initial product was stirred in a 1mol / L ammonium nitrate solution for 8 hours, filtered, washed, and this step was repeated 5 times, dried at 110°C for 10 hours, and then calcined at 500°C for 2 hours to obtain a hydrogen-type ZSM-5 molecular sieve; Hydrogen type ZSM-5 molecular sieve was mixed with molybdenum precursor solution, the type of molybdenum was ammonium molybdate, accounting for 1% mass ratio of molecular sieve, placed at room temperature for 12h, and then calcined at 500°C for 2h to obtain ZSM-5 catalyst.
[0074] Where...
Embodiment 2
[0078] 12.0g ethyl orthosilicate, 4.1g [C 22 h 45 –N + (CH 3 ) 2 –C 4 h 8 –N + (CH 3 ) 2 –C 6 h 13 ]Br 2 , 4g of CTAB, a certain amount of aluminum sulfate, and 0.7g of NaOH were mixed and stirred to form a precursor aqueous solution, which was left to stand for 24 hours. After the solid-liquid separation of the reaction material, it was dried at 110°C for 10 hours, and then roasted at 600°C for 6 hours to obtain the initial product; The initial product was stirred in a 1mol / L ammonium nitrate solution for 8 hours, filtered and washed, and this step was repeated 5 times, dried at 110°C for 10 hours, and then roasted at 500°C for 2 hours to obtain a hydrogen-type ZSM-5 molecular sieve; the obtained hydrogen Type ZSM-5 molecular sieve was mixed with molybdenum precursor solution, the type of molybdenum was ammonium molybdate, accounting for 1% mass ratio of molecular sieve, placed at room temperature for 12h, and then calcined at 500°C for 2h to obtain ZSM-5 catalyst....
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