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Synthetic method of aluminium oxide with two-stage pores

A synthesis method and alumina technology, which are applied in directions such as alumina/aluminum hydroxide, can solve the problems of high preparation cost, low macropore ratio and content, and time-consuming template assembly, and achieve simple and feasible preparation method and production cost. Low, good for the effect of transmission and diffusion

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] Although there have been many public reports on the preparation methods of existing macroporous materials, especially macroporous alumina, there are still some defects that need to be overcome. For example, the template assembly of the colloidal crystal template method takes too long, the preparation cost is high, and it is difficult to industrialize production. ; The macropore ratio and content of macroporous materials obtained by some technologies are too low, and the macropore diameter is generally greater than 200nm. The application value of the pore diameter is too large, and the macropore with high application value in the pore diameter range of 100-200nm is difficult to prepare.

Method used

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  • Synthetic method of aluminium oxide with two-stage pores
  • Synthetic method of aluminium oxide with two-stage pores

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Mix 5g of carbon black with 50mL of 0.02mol / L sodium hydroxide solution, stir at 70°C for 2h, then filter, and dry the obtained solid sample at 100°C for 10h;

[0040] (2) Mix 5g of aluminum nitrate with 50mL of distilled water and stir for 20min;

[0041] (3) Add the carbon black obtained in step (1) to the solution in step (2), stir for 1 hour, and then ultrasonicate for 5 hours;

[0042] (4) Put the substance obtained in step (3) in a water bath at 80°C and stir it to slowly evaporate the water until it becomes viscous, and then dry it at 100°C;

[0043] (5) Put the substance obtained in step (4) in a tube furnace, and feed nitrogen gas at a flow rate of 300mL / min, raise the temperature from room temperature to 450°C at 2°C / min, and keep the temperature constant for 3.5h; then feed oxygen, The oxygen flow rate was 300mL / min, and the temperature was kept at 450°C for 5 hours to obtain alumina, coded as CL1. The results of the concentration distribution and compar...

Embodiment 2

[0045] (1) Mix 6g of carbon black with 100mL of 0.02mol / L sodium hydroxide solution, stir at 70°C for 2h; then filter, and dry the obtained solid sample at 100°C for 10h;

[0046] (2) Mix 5g of aluminum nitrate with 60mL of distilled water and stir for 20min;

[0047] (3) Add the carbon black obtained in step (1) to the solution in step (2), stir for 1 hour, and then ultrasonicate for 7 hours;

[0048] (4) The substance obtained in step (3) was placed in a water bath at 80°C and stirred to evaporate the water until it became viscous, and then dried at 100°C;

[0049] (5) Place the substance obtained in step (4) in a tube furnace, and feed nitrogen gas at a flow rate of 200mL / min, raise the temperature from room temperature to 450°C at 2°C / min, and keep the temperature constant for 4 hours; then feed oxygen, oxygen The flow rate was 350mL / min, and the temperature was kept at 450°C for 7 hours to obtain alumina, coded as CL2. The concentration distribution and comparative area ...

Embodiment 3

[0051] (1) Mix 8g of carbon black with 80mL of 0.02mol / L sodium hydroxide solution, stir at 60°C for 2h; then filter, and dry the obtained solid sample at 100°C for 10h;

[0052] (2) Mix 4g of aluminum nitrate with 50mL of distilled water and stir for 20min;

[0053] (3) Add the carbon black obtained in step (1) to the solution in step (2), stir for 1 hour, and then ultrasonicate for 5 hours;

[0054] (4) The substance obtained in step (3) was placed in a water bath at 80°C and stirred to evaporate the water until it became viscous, and then dried at 100°C;

[0055] (5) Put the substance obtained in step (4) in a tube furnace, and feed nitrogen gas at a flow rate of 260mL / min, raise the temperature from room temperature to 500°C at 1°C / min, and keep the temperature constant for 4 hours; then feed oxygen, oxygen The flow rate was 300mL / min, and the temperature was kept at 500°C for 5 hours to obtain alumina, coded as CL3. The results of the concentration distribution and compa...

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Abstract

The invention provides a synthetic method of aluminium oxide with two-stage pores. Composition of aluminium oxide contains amorphous alumina which has two-stage pores. The synthetic method of aluminium oxide comprises the following steps: firstly mixing carbon black and alkali lye and stirring, preparing an aluminium salt solution, mixing filtered and dried carbon black and the aluminium salt solution and stirring, carrying out ultrasonic treatment, drying the mixture, and processing the dried mixture successively in a nitrogen atmosphere and in an oxygen atmosphere so as to obtain aluminium oxide. According to the method, expensive organic additives are not used, operating steps are simple and feasible, and production cost is low.

Description

technical field [0001] The invention belongs to the field of synthesis of porous inorganic materials, in particular to a synthesis method of two-stage pore alumina. Background technique [0002] According to the classification of the International Union of Pure and Applied Chemistry, porous materials can be divided into three categories: macroporous materials (direct>50nm), mesoporous materials (2nm≤direct≤50nm) and microporous materials (direct<2nm). Since microporous materials and mesoporous materials have been successfully applied in the fields of industrial catalysis and separation, they have always been a hot spot in research and application. In recent years, as macroporous materials have made up for the shortcomings of small-pore molecular sieves and mesoporous materials in the field of macromolecular catalysis and separation, and it is difficult to allow macromolecules to enter the interior of the channel, as well as the advantages of other physical and chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 范峰凌凤香王少军张会成陈晓刚杨春雁
Owner CHINA PETROLEUM & CHEM CORP