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A kind of preparation method of aluminum oxide

A technology of alumina and aluminum sulfate, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of long production process, high production cost, and inability to meet the demand for large specific surface area of ​​alumina for catalysis, and achieve short process, The effect of simple operation steps

Active Publication Date: 2020-09-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the invention is simple and feasible, electrolytic alumina can be successfully prepared, but the specific surface area of ​​this alumina is too small to meet the demand for large specific surface area of ​​catalytic alumina in the chemical industry
[0008] In summary, although the existing methods for preparing alumina are various and very mature, they all have long production processes, complicated operation steps, high preparation costs, and the properties of the prepared alumina products cannot meet the needs of the chemical industry. The problem of the demand for large specific surface area of ​​alumina for catalysis

Method used

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  • A kind of preparation method of aluminum oxide
  • A kind of preparation method of aluminum oxide
  • A kind of preparation method of aluminum oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Put 10g of aluminum sulfate in a closed reactor, feed hydrogen, and the flow rate is 400mL / min; raise the temperature to 300°C at 5°C / min for 2 hours; then raise the temperature to 600°C at 5°C / min for 3 hours; obtain alumina . The obtained sample number is CL1, and the crystal phase structure is shown in figure 1 , the pore properties are shown in Table 1. From figure 1 , figure 2 It can be seen from Table 1 that the obtained sample is γ-alumina with good pore structure.

Embodiment 2

[0022] Put 15g of aluminum sulfate in a closed reactor, pass in hydrogen, and the flow rate is 450mL / min; raise the temperature to 300°C at 6°C / min for 2 hours; then raise the temperature to 650°C at 6°C / min for 4 hours; obtain alumina . The obtained sample number is CL2, and the obtained sample is γ-alumina with a good pore structure.

Embodiment 3

[0024] Put 20g of aluminum sulfate in a closed reactor, feed hydrogen gas at a flow rate of 450mL / min; raise the temperature at 5°C / min to 300°C for 1 hour; then raise the temperature to 550°C at 5°C / min for 4 hours; obtain alumina . The obtained sample number is CL3, and the obtained sample is γ-alumina with a good pore structure.

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Abstract

The invention provides a method for preparing aluminum oxide. The aluminum oxide is crystal aluminum oxide and belongs to gamma-aluminum oxide in crystal structure; the aluminum oxide has the surfacearea of 150-400 m<2> / g and the pore volume of 0.2-0.55 cm<3> / g; the aluminum oxide has concentrated pore size distribution; the aluminum oxide product is obtained as follows: aluminum sulfate is put in a reactor, and hydrogen is introduced; the aluminum sulfate is heated to a set temperature with a certain heating procedure and treated at the constant temperature for a certain time. The provided preparation method is simple, easy to implement and low in production cost.

Description

technical field [0001] The invention relates to a method for preparing alumina, in particular to a method for preparing alumina with aluminum sulfate. Background technique [0002] Activated alumina is an important industrial catalyst carrier due to its porosity, high dispersion, large specific surface area and thermal stability. There are many ways to prepare activated alumina, two of which are more common, one is the Bayer process, that is, heating and dehydrating gibbsite or industrial aluminum hydroxide at high temperature; the other is by neutralizing solutions such as aluminum salts or by alcohol Aluminum is decomposed to obtain aluminum glue, and then activated at high temperature to prepare activated alumina. [0003] CN02158286.6 discloses a preparation method of activated alumina, which is a sodium metaaluminate solution prepared by aluminum hydroxide powder and sodium hydroxide, and the CO 2 Gel; then dry, and bake at 500 ~ 700 ℃ to get activated alumina. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/32
CPCC01F7/32C01P2002/72C01P2006/12C01P2006/14C01P2006/17
Inventor 范峰凌凤香张会成王少军杨春雁
Owner CHINA PETROLEUM & CHEM CORP