Preparation method of spherical silicon-aluminum composite carrier
A technology of aluminum composite and spherical silicon, which is used in catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low energy consumption, unfavorable industrialization promotion, poor applicability of raw materials, etc., and achieves high strength , shorten the production process steps, the effect of strong adaptability of raw materials
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Embodiment 1
[0019] At room temperature, use 15% nitric acid as the bottom liquid, gradually add sodium metaaluminate solution with a solid content of 10-20% by weight based on alumina for reaction under stirring, control the pH at the end point to 6-8.5, and directly carry out plate and frame filtration after the reaction and removing impurities to obtain an alumina hydrogel with a dry basis content of 15-30% by weight.
Embodiment 2
[0021] Get 400g of alumina hydrogel with a dry basis content of 20% prepared according to Example 1; add 20g of A380 powder (silicon dioxide powder produced by Degussa), and stir evenly; then add 400g of seaweed with a concentration of 2% by weight Sodium nitrate solution, stirred evenly to make a suspension slurry; drop the suspension slurry into an aluminum nitrate solution with an aluminum ion concentration of 1mol / L to form composite gel particles; take out the gel particles, and dry at 120°C for 10 hours. Then calcined at 550° C. for 4 hours to obtain a spherical silicon-aluminum composite carrier.
[0022] Analyze and characterize the product: particle size: 2.0±0.05mm; average strength: 85N / particle; pore volume: 0.78ml / g; specific surface area: 240m 2 / g.
Embodiment 3
[0024] Take 400g of alumina hydrogel with a dry basis content of 20% prepared according to Example 1; add 100g of A380 powder, and stir evenly; add 600g of sodium alginate solution with a concentration of 3% by weight, and stir evenly to make a suspension slurry ; Drop the suspension slurry into an aluminum nitrate solution with a molar concentration of aluminum ions of 0.5 mol / L to form composite gel particles; take out the gel particles, dry at 120°C for 10 hours, and then bake at 550°C for 4 hours to obtain spherical silica-alumina Composite carrier.
[0025] Analyze and characterize the product: particle size: 2.15±0.05mm; average strength: 50N / particle; pore volume: 0.95ml / g; specific surface area: 255m 2 / g.
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