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Preparation method for hierarchically mesoporous gamma-Al2O3 nanorods

A nanorod, grade technology, applied in nanostructure manufacturing, nanotechnology, nanotechnology, etc., can solve the problems of high cost, difficult to realize industrialization, difficult to control process conditions, etc.

Active Publication Date: 2010-11-10
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, at present, most of the synthetic mesoporous alumina uses expensive organic aluminum sources and templates, which are expensive, difficult to control the process conditions, and difficult to realize industrialization

Method used

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  • Preparation method for hierarchically mesoporous gamma-Al2O3 nanorods

Examples

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Embodiment 1

[0022] (1) Take 80ml of the prepared aluminum nitrate solution with a concentration of 1mol / L, add 27.4g of sucrose and 16g of PEG2W, stir to dissolve, and call it solution A1. Take 80ml of prepared ammonium carbonate solution with a concentration of 1.2mol / L, which is called solution B1.

[0023] (2) Under the condition of stirring, the solution A1 and the solution B1 are simultaneously added into a 200ml beaker for reaction in a co-current manner, and the reaction temperature is room temperature.

[0024] (3) Add 20ml of ammonia water with a concentration of 25% to the mixed solution obtained in (2), and adjust the p hour value of the system to 9.5.

[0025] (4) After aging the mixed solution obtained in (3) for 24 hours at room temperature, put it into a 200ml reactor, and conduct a hydrothermal reaction at 100°C for 24 hours;

[0026] (5) Filter the product obtained in (4), wash the filter cake with distilled water until the pH is 7-8, dry at 80°C for 48 hours; finally ro...

Embodiment 2

[0029] The preparation steps of this example are the same as Example 1, and the difference from Example 1 is that the PEG2W in Step 1 is changed from 16g in Example 1 to 24g.

[0030] The main physical and chemical properties of alumina: the specific surface area is 343.2m 2 / g, the pore volume is 1.54cm 3 / g, the pore size distribution is as figure 1 Shown: Double peaks appear at 3nm and 18nm, and the average pore diameter is 17.91nm.

Embodiment 3

[0032] The preparation steps of this example are the same as Example 1, and the difference with Example 1 is only that the concentration of the ammonium carbonate solution in Step 2 is changed from 1.2M in Example 1 to 5M.

[0033] The main physical and chemical properties of alumina: the specific surface area is 493.5m 2 / g, the pore volume is 1.07cm 3 / g, the pore size distribution is as figure 1 Shown: Double peaks appear at 2.4nm and 14.2nm, with an average pore size of 8.70nm.

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Abstract

The invention discloses a preparation method for pore canal aluminium oxide nanorods with hierarchical mesopores. The hierarchically mesoporous aluminium oxide nanorods with high specific surface area and large pore volume are synthesized by a hydrothermal crystallization method by taking aluminium nitrate as a precursor and ammonium carbonate or ammonium bicarbonate as a precipitate under the combined action of biological micromolecules such as sucrose and the like and macromolecules such as polyalcohol and the like. The small mesopores of the aluminium oxide obtained by the method are concentrated on about 3nm; the large mesopores can be adjusted and controlled within the range from 10 to 30nm; the length-diameter ratio of the nanorods is less than 50; and the specific surface reaches 500sq.m / g. The method has the advantages of overcoming the disadvantages of limitation of complex process route and high cost existing in a conventional synthetic mesoporous material. The obtained material has significant application value during the hydrotreating process of heavy distillate oil.

Description

technical field [0001] The invention relates to a preparation method of special pore nanorod aluminum oxide, which belongs to the field of preparation of catalytic materials. In this method, cheap inorganic salts are used as precursors, sugar biomolecules and polyalcohol macromolecules are used as structure-directing agents, and graded mesoporous alumina nanorods are synthesized by one-step hydrothermal method. This kind of alumina with special structure has excellent industrial application prospect in the process of heavy distillate oil hydrotreating. Background technique [0002] Mesoporous alumina (MA) is a specific surface over 350m 2 / g, porous alumina with pore size concentrated distribution between 2-50nm. Compared with traditional alumina, mesoporous alumina has a variety of excellent physical and chemical properties. Its specific surface area is large, its structure is regular, its pore size distribution is concentrated, and it has the outstanding characteristics ...

Claims

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Application Information

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IPC IPC(8): C01F7/24B82B3/00
Inventor 刘欣梅李翔薛红霞阎子峰
Owner PETROCHINA CO LTD
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