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Round alumina of containing silicon, and preparation method

A silica-alumina, spherical technology, which is applied in the field of spherical silica-containing alumina and its preparation, can solve problems affecting the performance of catalysts or catalyst carriers, failure to reach molecular state, dispersion, etc.

Inactive Publication Date: 2007-05-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

SiO 2 Added in the form of particles, it cannot achieve molecular state dispersion, which affects its performance as a catalyst or catalyst carrier

Method used

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  • Round alumina of containing silicon, and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A. Dissolve 30g of aluminum powder with an average particle size of 50 μm in 250g of 10% hydrochloric acid to prepare aluminum sol.

[0030] B. Add 8.3g NaSiO 3 9H 2 O was dissolved in 55g of deionized water, ion-exchanged through a 001×7 (732) strongly acidic styrene-based cation exchange resin column to obtain an acidic silica sol, and then 35g of hexamethylenetetramine was added to the acidic silica sol to fully dissolve.

[0031] C. Mix the above two solutions thoroughly, and drop them into the vacuum pump oil at 70°C with a droplet-type dispersing dripper to form. The formed pellets were separated from the oil and aged at 130°C for 5 hours.

[0032] D. Wash the obtained product, dry at 140°C for 10 hours, and bake at 550°C for 6 hours to obtain SiO 2 γ-shaped spherical alumina carrier with a content of 3%.

[0033] It has been determined that the specific surface area of ​​the spherical alumina carrier is 223m 2 / g, the pore volume is 0.82ml / g, and the bulk de...

Embodiment 2

[0035] Keep other preparation conditions constant in embodiment 1, in step B with 14.1g NaSiO 3 9H 2 O was dissolved in 70 g of deionized water, and the resulting SiO 2 5% gamma spherical alumina. Its specific surface area is 266m 2 / g, the pore volume is 0.94ml / g, and the bulk density is 0.46g / cm 3 , the average particle size is 2.3mm, and the Na content is 21ppm. The XRD spectrum is shown in curve 2 in Fig. 1 .

Embodiment 3

[0037] Keep other preparation conditions constant in embodiment 1, in step B with 23.3g NaSiO 3 9H 2 O was dissolved in 90 g of deionized water, and the resulting SiO 2 γ-type spherical alumina with a content of 8%. Its specific surface area is 309m 2 / g, the pore volume is 1.18ml / g, and the bulk density is 0.35g / cm 3 , the average particle size is 2.5mm, and the Na content is 25ppm. The XRD spectrum is shown in curve 3 in FIG. 1 .

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Abstract

This invention relates to a method for preparing spherical Al2O3 containing Si. The method comprises: adding silica sol into alumina sol to obtain mixed silica / alumina sol, performing oil drop method to obtain spheres, aging, washing, drying and torrefying to obtain spherical Al2O3 containing Si. The content of SiO2 is 1-15 wt.%, the specific surface area is 180-350 m2 / g, the particle diameters are 0.005-5 mm, the pore volume is 0.7-1.5 mL / g, the content of pores with diameters of 2-80 nm is higher than 70%, and the packing density is 0.30-0.60 g / cm3. The spherical Al2O3 containing Si can be used as catalyst or catalyst carrier for petrochemicals and fine chemicals, and is suitable for hydrogenation refinery and selective hydrogenation.

Description

Technical field: [0001] The invention relates to a spherical silicon-containing alumina and a preparation method thereof. The silicon-containing spherical alumina can be used as a catalyst or a catalyst carrier in petrochemical and fine chemical industries, and is more suitable for hydrogenation refining, selective hydrogenation, etc. hydrogen reaction. technical background: [0002] When alumina is used as a catalyst or a catalyst carrier for a catalytic reaction, its shape has a great influence on the catalytic reaction. The alumina used in industry has strip shape, column shape, honeycomb shape and spherical shape, etc. Among them, when spherical alumina is used as a fixed bed catalyst or catalyst carrier, the particles are in point contact with each other, and the stacking is uniform, which reduces the bed path. Resistance, which greatly improves the mass transfer and catalytic effect; when used as a fluidized bed catalyst or catalyst carrier, the spherical appearance c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B01J21/04
Inventor 李殿卿段雪刘鹏程林彦军
Owner BEIJING UNIV OF CHEM TECH
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