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A kind of preparation method of spherical silicon-alumina composite carrier

A technology of aluminum composite and spherical silicon, which is applied in the direction of catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of poor applicability of raw materials, unfavorable industrialization promotion, low energy consumption, etc., and achieve shortened production Process steps, strong adaptability of raw materials, high strength effect

Active Publication Date: 2016-05-18
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has low energy consumption, no pollution, simple process, and convenient operation, but it is only suitable for composite oxide wet filter cakes, and it is not suitable for silica gel and silica-alumina dry gel available on the market.
Therefore, its raw material applicability is not strong, is unfavorable for industrialization promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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 alginic acid with a concentration of 2% by weight Sodium 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, dry at 120°C for 10 hours, and 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 400 g of alumina hydrogel with a dry basis content of 20% prepared according to Example 1; add 100 g of A380 powder, and stir evenly; add 600 g of sodium alginate solution with a concentration of 3% by weight, and stir evenly to make a suspension slurry; Drop the suspension into an aluminum nitrate solution with an aluminum ion molar concentration of 0.5 mol / L to form composite gel particles; take out the gel particles, dry them at 120°C for 10 hours, and then bake them at 550°C for 4 hours to obtain spherical silicon-aluminum composites 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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Abstract

The invention relates to a preparation method of a spherical silicon-aluminum composite carrier. The preparation method is characterized by comprising the following steps: adding silicon dioxide to an alumina gel, and uniformly mixing; slowly adding to an alginate solution, and uniformly stirring to prepare suspension slurry; dropping the suspension slurry into a multivalent metal cation solution to form a spherical composite gel granule; taking out the spherical composite gel granule, and drying and calcining to obtain the spherical silicon-aluminum composite carrier, wherein the alumina gel is an alumina hydrogel or a nano-alumina sol, the addition amount of the silicon dioxide is 0.1-0.3 time more than the weight of the alumina gel in terms of Al2O3, the suspension slurry contains 5%-25% by weight of solids and 0.3%-5% by weight of alginate, the soluble alginate is one or more of sodium alginate, potassium alginate, magnesium alginate and ammonium alginate, and the multivalent metal cation solution is an aluminum, zinc, calcium, copper, iron, ferrous iron, cobalt, manganese or nickel ion salt solution with the saturation concentration of 0.1 mol / L. The spherical silicon-aluminum composite carrier obtained through the preparation method disclosed by the invention has the advantages of high strength, large pore volume and low bulk density.

Description

technical field [0001] The invention relates to the technical field of catalyst carriers, in particular to a method for preparing a spherical silicon-aluminum composite carrier. technical background [0002] Alumina is the most widely used catalyst carrier, accounting for about 70% of the total amount of catalyst carrier. Studies have shown that adding a certain amount of silica to alumina to prepare a silicon-alumina composite carrier is not only beneficial to increase the specific surface area of ​​the carrier, but also to increase the acidity, improve the acid distribution, play a role in solid acid catalysis, and play a role in catalytic cracking, adding The hydrocracking reaction is very favorable. [0003] When the carrier is used in a catalytic reaction, its shape also has a great influence on the catalytic reaction. Industrial applications of silicon-aluminum composite supports include strips, columns, honeycombs, and spheres, among which spherical particles have t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/06B01J35/08
Inventor 于海斌李晓云杨文建孙彦民耿姗孟广莹周鹏谢献娜
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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