A kind of preparation method of composite carrier
A composite carrier and precursor technology, applied in catalyst carrier, chemical instrument and method, catalyst activation/preparation, etc., can solve problems such as difficult effective combination, carrier pore structure damage, etc., to improve carrier strength and facilitate peptization , the effect of uniform carrier properties
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Embodiment 1
[0029]Put 1 L of aluminum sulfate solution (concentration of 0.2 mol / L) and 1 L of sodium metaaluminate solution (concentration of 0.3 mol / L) in the raw material tank respectively, and place 1 L of pure water in the reaction tank as the bottom liquid, pass The temperature of the reaction tank is controlled to 60° C. by water circulation, and a small amount of sodium hydroxide is added to make the pH value of the solution 8.5. Inject the aluminum sulfate solution into the reaction tank at a rate of 10 mL / min, and at the same time inject the sodium metaaluminate solution and adjust the rate so that the pH value of the reaction tank solution is constant at 8.8. After 60 min, the neutralization is completed, and the Na is fully washed to remove + ions and SO 4 2- After ionization, a certain amount of deionized water was added to obtain pseudo-boehmite slurry A with a solid-to-liquid ratio of 8% (calculated as alumina).
Embodiment 2
[0031] 50g ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 30.0, the unit cell constant is 20 Å, and the relative crystallinity is 85%), and put it into the 625g pseudoboehmite slurry A obtained in Example 1, stir well and then add 200g ethanol, continue stirring evenly, then add 50g of tetraethoxysilane, after continuous stirring, a small amount of tetramethylammonium hydroxide was added to adjust the pH value of the slurry to 8.5. Put it in a closed autoclave, age at 185°C for 24 hours, take it out and filter until the water content of the filter cake is 39%, add 8g of ethylenediamine and 6g of tetraethoxysilane and knead it into a plastic body, then extrude into a strip, and dry at 100°C After 3 hours, it was calcined at 500° C. for 4 hours to obtain the final composite carrier S-1.
Embodiment 3
[0033] 10g SBA-15 mesoporous molecular sieve (SiO 2 / Al 2 o 3 The molar ratio is 35.0) into the 625g pseudo-boehmite slurry A obtained in Example 1, and then add 500g isopropanol after stirring evenly, and then add 75g dimethylvinylethoxysilane after continuing to stir evenly, After continuing to stir evenly, add a small amount of triethanolamine to adjust the pH value of the slurry to 9.0. Put it in a closed autoclave, age at 160°C for 20 hours, take it out and filter until the water content of the filter cake is 52%, add 3.5g of diethylamine and 4g of dimethylethoxysilane and knead it into a plastic body, and then extrude it into a strip. After drying at 100°C for 3 hours, it was calcined at 500°C for 4 hours to obtain the final composite carrier S-2.
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