Flaky gamma-Al2O3 nanometer crystal and preparation method thereof

A nano-grain and flaky technology, which is applied in the field of flaky γ-Al2O3 nano-grain and its preparation, can solve the problems of low reactivity, small specific surface area of ​​alumina, and few applications, and achieve cheap raw materials and simple preparation process easy effect

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This form of alumina has a small specific surface area and low reactivity, and it is different from the flake γ-Al 2

Method used

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  • Flaky gamma-Al2O3 nanometer crystal and preparation method thereof
  • Flaky gamma-Al2O3 nanometer crystal and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0024] Example 1

[0025] Prepare 10ml of 0.2mol / L aluminum nitrate solution and 30ml of 0.2mol / L sodium hydroxide solution, and then mix and stir the sodium hydroxide solution and aluminum nitrate solution under the condition of 0.5KW / L ultrasonic and vigorous stirring Evenly. The mixture was sealed and kept under hydrothermal conditions at 190°C for 24 hours. Then it was cooled to room temperature, and the product was separated and washed several times with distilled water to remove the impurity ions. After drying, it was calcined at 550°C for 7 hours to obtain flake γ-Al 2 O 3 Nano crystal grains have a length of 10-26nm and a thickness of 5-8nm. The alumina nanoparticles are characterized as γ-Al by powder X-ray diffraction 2 O 3 , The specific surface area is 167m 2 / g.

Example Embodiment

[0026] Example 2

[0027] Prepare 10ml of 0.2mol / L aluminum nitrate solution and 35ml of 0.2mol / L lithium hydroxide solution, and then mix the sodium hydroxide solution with aluminum nitrate solution and stir evenly under the action of 0.5KW / L ultrasound and stirring . The mixture was kept tightly closed under hydrothermal conditions at 200°C for 16 hours. Then it was cooled to room temperature, and the product was separated and washed several times with distilled water to remove the impurity ions. After drying, it was calcined at 550°C for 5 hours to obtain flake γ-Al 2 O 3 The length of the nano crystal grain is 30-50nm and the thickness is 5-10nm. The alumina nanoparticles are characterized as γ-Al by powder X-ray diffraction 2 O 3 , The specific surface area is 133m 2 / g.

Example Embodiment

[0028] Example 3

[0029] Prepare 10ml of 1mol / L aluminum nitrate solution and 43ml of 1mol / L sodium hydroxide solution, and then mix the sodium hydroxide solution and aluminum nitrate solution under 4KW / L ultrasound and stirring and stir evenly. The mixture was kept tightly closed under hydrothermal conditions at 220°C for 6 hours. Then it was cooled to room temperature, and the product was separated and washed with distilled water several times to remove the impurity ions. After drying, it was calcined at 650°C for 3 hours to obtain flake γ-Al 2 O 3 The nanocrystalline grains have a length of 25-40 nm and a thickness of 7-10 nm. The alumina nanoparticles are characterized as γ-Al by powder X-ray diffraction 2 O 3 , The specific surface area is 125m 2 / g.

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Abstract

The invention discloses a flaky gamma-Al2O3 nanometer crystal and a preparation method thereof. The flaky gamma-Al2O3 nanometer crystal is prepared from a mixture of an inorganic aluminum salt solution and an alkaline solution with a certain concentration under a hydrothermal condition. The crystal form of the hydrothermal product obtained after calcination is gamma-Al2O3, the specific surface area is 110-200m<2>/g, the size of particles is 15-50nm, and the thickness is 5-10nm. Compared with an existing preparation method of flaky Al2O3 particles, the price of raw materials is low, the preparation process is simple and feasible, the product particles have nanoscale sizes, the specific surface area is relatively high, and the preparation method can be used for catalysis, adsorption, separation and other oil chemical processes.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and relates to a flaky γ-Al 2 o 3 Nanocrystalline particles and methods for their preparation. Background technique [0002] As an important inorganic functional material, alumina is widely used in petrochemical, catalysis, adsorption and ceramic toughening materials. Nanomaterials have excellent physical and chemical properties due to their particular shapes. The preparation methods of various forms of nano-alumina materials include chemical vapor deposition, pyrolysis, water (solvent) thermal method, and hard template method. As one of the forms of nanomaterials, the preparation of flaky alumina nanomaterials has attracted great attention of researchers. [0003] In the literature "Gas-phase synthesis and mechanical properties of alumina nanosheets" ("Powder Metallurgy Materials Science and Engineering", 2011, 16 (6)), Al sheets and SiO 2 Powder as raw material, with H 2...

Claims

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Application Information

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IPC IPC(8): C01F7/02B82Y40/00
Inventor 杨卫亚凌凤香王少军沈智奇郭长友季洪海王丽华孙万付
Owner CHINA PETROLEUM & CHEM CORP
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