Method for preparing amorphous silicon alumnium using carbonization method

An amorphous silicon-alumina, carbonization technology, applied in chemical instruments and methods, catalyst activation/preparation, aluminum silicate, etc., can solve the problem of inactive components providing higher metal dispersion, environmental pollution, pore volume and ratio problems such as low surface, to achieve the effect of easy control, low energy consumption, and convenient silicon source

Active Publication Date: 2006-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 value 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 dispersi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] (1) Prepare solid sodium aluminate to a concentration of 200g Al 2 O 3 / l concentrated sodium aluminate solution, and then diluted to a concentration of 30g Al 2 O 3 / l Sodium aluminate working solution, which contains SiO 2 28wt% sodium silicate solution, and then diluted to a concentration of 100g SiO 2 / l Sodium silicate working solution.

[0037] (2) Take 10L of sodium aluminate working solution and put it in the gel forming tank, then add 0.43L of sodium silicate working solution, control the reaction temperature at 25℃, and pass in CO with a concentration of 50v% 2 Gas, CO 2 Gas flow rate 5Nm 3 / h, stop CO when the pH value reaches 9.0 2 , Ventilate 0.86L of sodium silicate working solution.

[0038] (3) Add 10L of sodium aluminate working solution within 15 minutes under ventilated conditions, then add 0.43L of sodium silicate working solution, control the reaction temperature at 25°C, stop the air and let in CO 2 Gas, stop CO when the pH value reach...

Example Embodiment

[0040] Example 2

[0041] Sodium aluminate working solution concentration 30g Al 2 O 3 / L, concentration of sodium silicate working solution 100 SiO 2 / l, take 10L of sodium aluminate working solution and put it in the gel tank, then add 0.63L of sodium silicate working solution, control the reaction temperature to 20℃, and pass in CO with a concentration of 40v% 2 Gas, CO 2 Gas flow 4Nm 3 / h, after 5 minutes of ventilating, add 0.66L of sodium silicate working solution while ventilating, stop when the pH value reaches 8.5, and then repeat step (3) in Example 1 for 3 times according to the above gel forming conditions, and then ventilate and stabilize for 15 minutes , The slurry was filtered and dried as in Example 1, to obtain the amorphous silicon-alumina product SL-2.

Example Embodiment

[0042] Example 3

[0043] Sodium aluminate working solution concentration 30gAl 2 O 3 / L, the concentration of sodium silicate working solution is 150 SiO 2 / l, take 10L of sodium aluminate working solution and put it in the gel tank, then add 0.20L of sodium silicate working solution, control the reaction temperature to 30℃, and pass in CO with a concentration of 48v% 2 Gas, CO 2 Gas flow rate 5Nm 3 / h, add 0.05L of sodium silicate working solution for 5 minutes, stop when the pH value reaches 9.5, and then repeat step (3) in Example 1 according to the above gelation conditions for 1 time, and then ventilate and stabilize for 20 minutes. Filtration and drying were the same as in Example 1, to obtain the amorphous silicon-alumina product SL-3.

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Abstract

This invention discloses a method to prepare amorphous silica-alumina, which comprises: forming gel by mix of sodium aluminate solution and silicon-containing compound and CO2, filtering, cleaning and drying. Wherein, the forming gel process uses pH-value swinging method, and during the process, it adds silicon-containing compound step by step. This method needs low cost, has no pollution; the product has well chemical properties, can be used as carrier component in catalytic cracking and hydrocracking or olefin oligopolymerization 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] The preparation of amorphous silica-alumina in the prior art is mostly limited by the preparation method. If it is required to have a large surface area and pore volume, it cannot introduce a sufficient amount of silica, and its acidity is...

Claims

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Application Information

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IPC IPC(8): C01B33/46B01J20/16B01J21/12B01J32/00B01J37/03
Inventor 孙晓艳樊宏飞赵崇庆
Owner CHINA PETROLEUM & CHEM CORP
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