Method of preparing amorphous silica-alumina using carbonization

A technology of amorphous silica-alumina and sodium aluminate, applied in chemical instruments and methods, catalyst activation/preparation, chemical/physical processes, etc., can solve environmental pollution and provide higher metal dispersion and pore volume for inactive components and low specific surface area to achieve the effects of low energy consumption, easy control, and convenient silicon source

Inactive Publication Date: 2005-03-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
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AI Technical Summary

Problems solved by technology

The preparation method is to form a mixed solution of alkali metal aluminum salt and silicate at a pH of about 12, and then react with aluminum sulfate to prepare a silicon-aluminum carrier. The specific surface of the product is 277m 2 / g, pore volume 0.31ml / g, containing SiO 2 35wt%, the disadvantage is that the pore volume and specific surface are low, as a carrier catalyst, silica-alumina cannot provide higher metal dispersion for active components
[0006] CN1210755A discloses a kind of amorphous silicon aluminum and its preparation method, its silicon oxide content is 10~50wt%, specific surface is 350~600m 2 / g, pore volume 0.8~1.5ml / g, infrared acidity 0.25~0.55mmol / g, its preparation process is NH 4 OH and alumina first form alumina and then decompose silicate, which will produce ammonia and nitrogen-containing wastewater and pollute the environment

Method used

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Examples

Experimental program
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Effect test

example 1

[0028] Prepare solid sodium aluminate to a concentration of 200g Al 2 o 3 / l concentrated sodium aluminate solution, then diluted to a concentration of 20g Al 2 o 3 / l sodium aluminate working solution, take SiO 2 28wt% sodium silicate solution, then diluted to a concentration of 100g SiO 2 / l sodium silicate working solution. Take 10L of sodium aluminate working solution and place it in a gel-forming tank, then add 0.3L of sodium silicate working solution, control the reaction temperature at 24°C, and feed in a flow rate of 6Nm 3 / h, the concentration is 50v% CO 2 gas, stop passing CO when the pH reaches 9.0 2 , add 0.6L sodium silicate working solution, then ventilate and stabilize for 10 minutes, the slurry is filtered and washed with 75°C deionized water until neutral. Dry at 120°C for 8 hours, pulverize and sieve to obtain the amorphous silica-alumina product GL-1.

example 2

[0030] Sodium aluminate working solution concentration 25g Al 2 o 3 / L, sodium silicate working solution concentration 100 SiO 2 / l, take 10L of sodium aluminate working solution and place it in a gel-forming tank, then add 0.5L of sodium silicate working solution, control the reaction temperature at 20°C, and feed in a flow rate of 4Nm 3 / h, the concentration is 35v% CO 2 Gas, after 5 minutes, add 0.6L sodium silicate working solution while ventilating, stop when the pH value reaches 9.5, then ventilate stably for 15 minutes, the slurry is filtered and dried as in Example 1, the amorphous silicon aluminum product GL-2.

example 3

[0032] Sodium aluminate working solution concentration 30g Al 2 o 3 / L, sodium silicate working solution concentration 150 SiO 2 / l, take 10L of sodium aluminate working solution and place it in a gel-forming tank, then add 0.20L of sodium silicate working solution, control the reaction temperature at 30°C, and feed in a flow rate of 7Nm 3 / h, the concentration is 44v% CO 2 Gas, after 4 minutes, add 0.05L sodium silicate working solution, stop when the pH value reaches 10.0, then ventilate for 20 minutes, the slurry is filtered and dried as in Example 1, amorphous silicon aluminum product GL-3.

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Abstract

A process for preparing the amorphous Si-Al material by the carbonizing method includes such steps as adding part of sodium silicate solution to sodium aluminate solution, introducing CO2 gas to it for a certain time, adding the rest of sodium silicate solution while reacting, stabilizing, filtering, washing and drying. It can be used as the carrier of catalyst.

Description

technical field [0001] The invention relates to a method for preparing amorphous silicon-aluminum, in particular to a method for preparing amorphous silicon-aluminum by a carbon dioxide neutralization method (that is, a carbonization method). Background technique [0002] Amorphous silica-alumina has certain pore structure and specific surface area, so it can be used as catalyst carrier and adsorbent in oil refining and petrochemical industry. Amorphous silica-alumina as a catalyst carrier requires itself to have a large specific surface and pore volume to ensure the dispersion of catalyst active components, and as a carrier for cracking catalysts, amorphous silica-alumina must also have a certain cracking activity (i.e. acidic). [0003] With the rapid development of the petrochemical industry, the demand for amorphous silicon-alumina is increasing, but the amorphous silicon-alumina prepared by the existing technology mostly uses NH 4 OH, which will produce wastewater con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/12B01J37/03
Inventor 樊宏飞关明华孙晓艳赵崇庆
Owner CHINA PETROLEUM & CHEM CORP
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