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Preparation method of mesoporous gamma-Al2O3 carrier, and mesoporous gamma-Al2O3 carrier

A carrier and mesoporous technology, applied in the preparation of alumina/hydroxide, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of limited purity of pseudo-boehmite, difficulty in removing Na ions, and inappropriateness

Active Publication Date: 2020-11-17
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that sodium aluminate is used as the aluminum source, Na ions are difficult to remove, and the purity of the obtained pseudo-boehmite is limited, which is not suitable for use as a carrier for some catalysts that have high requirements for impurity content.

Method used

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  • Preparation method of mesoporous gamma-Al2O3 carrier, and mesoporous gamma-Al2O3 carrier
  • Preparation method of mesoporous gamma-Al2O3 carrier, and mesoporous gamma-Al2O3 carrier
  • Preparation method of mesoporous gamma-Al2O3 carrier, and mesoporous gamma-Al2O3 carrier

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preparation example Construction

[0021] The first aspect of the present invention provides a mesoporous γ-Al 2 o 3 The preparation method of carrier, wherein, this method comprises the following steps:

[0022] (1) The seed crystal is contacted with a mixed aqueous solution containing an aluminum source and a precipitating agent to carry out a hydrothermal reaction to obtain a slurry containing an alumina precursor;

[0023] (2) spray drying after mixing the slurry and water to obtain alumina precursor microspheres;

[0024] (3) Calcining the alumina precursor microspheres.

[0025] According to the present invention, the type selection of the seed crystal is very critical, which has a great influence on the pore structure of the prepared alumina. In the present invention, the seed crystal can be selected from among pseudoboehmite, aluminum hydroxide and aluminum oxide. One or more of; Preferably, the seed crystal is pseudo-boehmite. In addition, in the present invention, the introduction of seed crystals...

Embodiment 1

[0047] This example is to illustrate the mesoporous γ-Al prepared by the method of the present invention 2 o 3 .

[0048] Take by weighing 580.0g aluminum chloride hexahydrate and 360.0g urea and dissolve in 940.0ml deionized water, 23.0g pseudo-boehmite powder (average pore diameter 6.0nm, pore volume 0.5cm 3 / g) is added to the above mixed solution, wherein, the aluminum element (Al s ) and Al in the aluminum source solution 3+ Ions (Al l ) molar ratio (Al s / Al l ) is 0.15:1. After peptizing for 2 hours, transfer it to a stainless steel hydrothermal kettle of 316L material; heat the stainless steel hydrothermal kettle to 180°C and keep the temperature for 4 hours;

[0049] After cooling, the slurry produced by the hydrothermal reaction was filtered and washed, and 500.0ml deionized water was added each time, and washed 5 times in total, so that the pH of the filter cake was 7, and the conductivity of the filtrate was less than 50 μs / cm; The cake was mixed with 300.0...

Embodiment 2

[0051] This example is to illustrate the mesoporous γ-Al prepared by the method of the present invention 2 o 3 .

[0052] Take by weighing 316.0g aluminum nitrate nonahydrate and 215.0g urea and be dissolved in 960.0ml deionized water, 30.0g pseudo-boehmite powder (average pore diameter 6.0nm, pore volume 0.5cm 3 / g) added to the above mixed solution, wherein, the aluminum element (Al s ) and Al in the aluminum source solution 3+ Ions (Al l ) molar ratio (Al s / Al l ) is 0.3:1. After peptizing for 4 hours, transfer it to a 316L stainless steel hydrothermal kettle; heat the hydrothermal kettle to 120°C and keep the temperature constant for 20 hours;

[0053]After cooling, filter and wash the slurry produced by the hydrothermal reaction, add 600.0ml deionized water each time, and wash 5 times in total, so that the pH of the filter cake is 7, and the conductivity of the filtrate is less than 50 μs / cm; The cake was mixed with 500.0ml of deionized water and repulped, then s...

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Abstract

The invention relates to the field of preparation of porous materials, and discloses a preparation method of a mesoporous gamma-Al2O3 carrier, and the mesoporous gamma-Al2O3 carrier. The method comprises the following steps: (1) contacting a seed crystal with a mixed aqueous solution containing an aluminum source and a precipitant, and carrying out a hydrothermal reaction to obtain slurry; (2) mixing the slurry with water, and carrying out spray drying to obtain alumina precursor microspheres; and (3) roasting the alumina precursor microspheres. Besides, a seed crystal used in the method can be continuously recycled; expensive substances such as alcohol, organic acid, a surfactant and a template agent do not need to be used; experimental steps are simple; a preparation period is short; themethod is suitable for large-scale continuous production; gamma-Al2O3 can be prepared through the method, free modulation of the pore structure and the pore diameter of the catalyst carrier can be achieved, and therefore, the catalyst carrier with the pore structure suitable for various catalytic reaction systems is obtained.

Description

technical field [0001] The invention relates to the field of preparation of porous materials, in particular to a mesoporous γ-Al 2 o 3 Preparation method of carrier and mesoporous γ-Al 2 o 3 carrier. Background technique [0002] Due to the advantages of large specific surface area, adjustable morphology and pore size, high mechanical strength, good thermal and chemical stability, mesoporous γ-Al 2 o 3 Materials are widely used in the field of catalyst supports. Catalyst support not only acts as a skeleton for supporting active components, but also has a great influence on catalyst selectivity, heat transfer (mass) performance, service life and production cost. Therefore, in many catalytic reaction systems, physical and chemical properties such as texture / structural properties, hydrothermal stability and purity of the alumina support used are required. [0003] For example, for cobalt-based Fischer-Tropsch synthesis catalysts, both the purity and pore structure of the...

Claims

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Application Information

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IPC IPC(8): C01F7/30B01J21/04B01J35/10
CPCC01F7/30B01J21/04C01P2006/17C01P2006/12C01P2006/14C01P2006/80B01J35/61
Inventor 秦绍东李加波杨霞门卓武孙琦杨林颜
Owner CHNA ENERGY INVESTMENT CORP LTD