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A kind of preparation method of aluminum oxide

A technology of alumina carrier and aluminum salt, which is applied in the field of preparation of alumina carrier, can solve the problems of complex preparation process and small carrier pore size, and achieve the effects of simplifying the preparation process, large pore size and reducing production cost

Active Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the prior art uses aluminum salt as the aluminum source and urea as the precipitating agent to prepare pseudo-boehmite and alumina, usually through hydrothermal reaction to obtain precipitates, and the precipitates are filtered, washed, dried, and roasted to obtain oxides. Aluminum, the alumina prepared by this method has a higher specific surface, but the pore size of the carrier is smaller, and the preparation process is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Measure 50ml concentration and be the aluminum nitrate solution of 0.5mol / L, add 12g urea in above-mentioned solution to make urea and Al 3+ The molar ratio of the above solution is 8:1. Transfer the above solution into a 100ml reaction kettle and react at 160°C for 8 hours under sealed conditions. The obtained precipitate is filtered and dried at 60°C for 42 hours without washing. The obtained precipitate is crushed in 600°C The alumina support S1 was prepared by calcination at ℃ for 4 hours. The average pore diameter of the obtained alumina support was 13nm, the pore volume of 10nm-20nm pores accounted for 62% of the total pore volume, and the specific surface area of ​​the support was 319m 2 / g.

example 2

[0022] With example 1, just the concentration of aluminum nitrate solution is 2mol / L, urea and Al 3+ The molar ratio is 6:1, the hydrothermal reaction is 140°C for 10 hours, and the obtained precipitate is dried at 90°C for 24 hours to obtain alumina carrier S2. The pore volume accounts for 65% of the total pore volume, and the specific surface area of ​​the carrier is 308m 2 / g.

example 3

[0024] With example 1, just the concentration of aluminum nitrate solution is 1mol / L, urea and Al 3+ The molar ratio is 4:1, the hydrothermal reaction is 200°C for 6 hours, and the obtained precipitate is dried at 50°C for 48 hours to obtain alumina carrier S3. The pore volume accounts for 57% of the total pore volume, and the specific surface area of ​​the carrier is 331m 2 / g.

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PUM

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Abstract

The invention discloses a preparation method of an alumina carrier. The method includes the following steps: measuring an appropriate amount of an aluminum salt solution with concentration of 0.5-2.5 mol / L, adding an appropriate amount of urea to the aluminum salt solution and stirring to completely dissolve the urea, wherein the molar ratio of urea to Al<3+> is 2-10:1; placing the solution into a sealed reaction container and reacting at 140-200 DEG C for 2-12 h; and after the reaction, the directly drying and calcining the materials without filtering or washing to obtain the alumina carrier. The method uses inorganic aluminium salt as an aluminum source and urea as a precipitating agent, and has simple operation process; and the prepared alumina carrier has high specific surface area and large pore size.

Description

technical field [0001] The invention relates to a method for preparing an alumina carrier, in particular to a method for preparing an alumina carrier with a relatively high specific surface area and a relatively large pore diameter. Background technique [0002] γ-Al 2 o 3 It is a porous and highly dispersed solid material with large surface area, good adsorption performance, acidic surface and good thermal stability. It can be used as a catalyst carrier for various chemical reactions. In addition, it is also widely used in petroleum, national defense, chemical fertilizer, medicine, health and other departments. γ-Al 2 o 3 The carrier is usually prepared by heating and dehydrating pseudo-boehmite above 450°C. The preparation methods of pseudo-boehmite usually include acid precipitation, alkali precipitation, aluminum alcohol hydrolysis, carbonization, etc. Acid precipitation method is to neutralize sodium aluminate with strong acid or aluminum salt of strong acid, first...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/34
Inventor 季洪海沈智奇凌凤香王少军杨卫亚王丽华郭长友
Owner CHINA PETROLEUM & CHEM CORP