Hierarchical pore HZSM-5 zeolite molecular sieve
A zeolite molecular sieve and multi-stage pore technology, which is applied in the direction of molecular sieve catalysts, molecular sieves and alkali exchange compounds, crystalline aluminosilicate zeolites, etc., can solve the problems of uncontrollable pore structure, low yield of aromatic hydrocarbons, high yield of aromatic hydrocarbons, etc.
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Embodiment 1
[0045] Catalyst preparation:
[0046] (1) 10 g of commercial ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 =38) After roasting in a muffle furnace at 550°C for 5h, mix it with 300mL NaOH solution with a concentration of 0.1mol / L, and reflux and stir in an oil bath at 60°C for 1h; separate the reaction mixture from solid to liquid, and use deionized After fully washing with water, the separated solid was dried at 110°C for 12 hours to obtain solid A;
[0047] (2) Mix the molecular sieve obtained in step (1) with 300 mL of HCl solution with a concentration of 0.1 mol / L, and reflux and stir in an oil bath at 60°C for 1 hour; , drying the separated solid at 110°C for 12h to obtain solid B;
[0048] (3) Dissolve 1g of solid B, 0.16g of sodium metaaluminate, and 4.88g of tetrapropylammonium hydroxide (25% aqueous solution) in 13.5g of water, then add dropwise 6.25g of ethyl orthosilicate, and mix and prepare at room temperature The aqueous precursor solution of molecular sieves was st...
Embodiment 2
[0053] According to Example 1, only the alkali solution is changed to NaOH solution with a concentration of 0.5mol / L, and the oil bath is refluxed and stirred for 4 hours at 80°C, and only the acid solution is changed to an HCl solution with a concentration of 0.5mol / L, and the oil bath is heated at 80°C After reflux and stirring for 4 hours, only the crystallization time was changed for 72 hours, and other conditions remained unchanged, a hierarchically porous HZSM-5 zeolite molecular sieve was obtained, denoted as BA2.
[0054] The aromatics yield of cellulose pyrolysis catalyzed by the hierarchically porous HZSM-5 zeolite molecular sieve prepared in this example was 37.4%, and the coke yield was 32.7%.
Embodiment 3
[0056] According to Example 1, only the alkali solution is changed to NaOH solution with a concentration of 1.0mol / L, and the oil bath is refluxed and stirred for 8 hours at 100°C, and only the acid solution is changed to an HCl solution with a concentration of 1.0mol / L. Refluxing and stirring for 8 hours, only changing the crystallization time for 96 hours, and keeping other conditions unchanged, a hierarchically porous HZSM-5 zeolite molecular sieve was obtained, denoted as BA3.
[0057] The aromatics yield of cellulose pyrolysis catalyzed by the hierarchically porous HZSM-5 zeolite molecular sieve prepared in this example was 43.7%, and the coke yield was 26.1%.
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