A kind of high mesopority h-zsm-5 molecular sieve with uniform bulk mesopore distribution and its preparation method and application
A H-ZSM-5 technology with uniform distribution, applied in molecular sieve catalysts, molecular sieve characteristic polymorphic crystalline silicon, chemical instruments and methods, etc., can solve the problems of reducing the acidity of molecular sieves, removing framework aluminum, etc., and achieve inhibition of carbon deposition. problem, the effect of improving diffusion performance
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Embodiment 1
[0031] (1) Synthesis of pure silicon molecular sieve silicalite-1
[0032] Ethyl orthosilicate is used as silicon source, tetrapropylammonium hydroxide is used as template, ethanol and deionized water are used as solvent, and ethyl orthosilicate is used as SiO2 In terms of tetrapropyl ammonium hydroxide in terms of TPAOH, the molar composition of each raw material is 1SiO 2 : 0.27TPAOH:4EtOH: 10H 2 O, the above solution was aged at 35°C for 5 hours and then transferred to a crystallization kettle for crystallization at 170°C for 3 days. After the product was centrifugally washed and dried, the powder was roasted in a muffle furnace at 550°C for 6 hours to obtain a 0.2 μm Pure silicon molecular sieve silicalite-1.
[0033] (2) Preparation of bulk homogeneous mesoporous Na-ZSM-5
[0034] The pure silicon molecular sieve silicalite-1 prepared in step (1) is used as the silicon source, sodium metaaluminate is used as the aluminum source, and SiO is formed according to the molar ...
Embodiment 2
[0042] (1) Synthesis of pure silicon molecular sieve silicalite-1
[0043] The raw material molar composition of embodiment 1 is adjusted 1SiO 2 : 0.2TPAOH: 4EtOH: 46H 2 O, aging at 25°C for 6 hours, crystallization at 150°C for 4 days, the obtained product was centrifugally washed and dried, and the powder was calcined in a muffle furnace at 400°C for 7 hours to obtain a 0.6 μm pure silicon molecular sieve silicalite-1.
[0044] (2) Preparation of bulk homogeneous mesoporous Na-ZSM-5
[0045] The pure silicon molecular sieve silicalite-1 prepared in step (1) is used as the silicon source, sodium metaaluminate is used as the aluminum source, and SiO is formed according to the molar composition 2 : Al 2 o 3 =1: 0.0056 dissolved in TPAOH solution with a concentration of 0.1mol / L, wherein TPAOH :silicalite-1=10ml: 1g, fully stirred at room temperature, crystallized in a crystallization kettle at 150°C for 5 days, and the obtained product was centrifugally washed and dried Af...
Embodiment 3
[0050] (1) Synthesis of pure silicon molecular sieve silicalite-1
[0051] The raw material molar composition of embodiment 1 is adjusted 1SiO 2 : 0.17TPAOH: 3EtOH: 46H 2 O, aged at 40°C for 4 hours, crystallized at 130°C for 9 days, the product obtained was centrifugally washed and dried, and the powder was calcined in a muffle furnace at 450°C for 7 hours to obtain a 1 μm pure silicon molecular sieve silicalite-1.
[0052] (2) Preparation of bulk homogeneous mesoporous Na-ZSM-5
[0053] The pure silicon molecular sieve silicalite-1 prepared in step (1) is used as the silicon source, sodium metaaluminate is used as the aluminum source, and SiO is formed according to the molar composition 2 : Al 2 o 3 =1: 0.0033 dissolved in a TPAOH solution with a concentration of 0.2mol / L, where TPAOH:silicalite-1=10ml: 1g, fully stirred at room temperature, crystallized in a crystallization kettle at 200°C for 2 days, and the obtained product was washed and dried by centrifugation Afte...
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