Nanowire-shaped spherical alumina with large aspect ratio and preparation method thereof

A spherical alumina, large aspect ratio technology, applied in alumina/aluminum hydroxide and other directions, can solve the problems of high cost of SB powder, pollution, complicated process, etc., and achieve the effect of low price, low cost and simple steps

Active Publication Date: 2021-10-08
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, more organic matter needs to be added during the molding process, which not only complicates the process, but also produces pollution, and the cost of SB powder is relatively high

Method used

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  • Nanowire-shaped spherical alumina with large aspect ratio and preparation method thereof
  • Nanowire-shaped spherical alumina with large aspect ratio and preparation method thereof
  • Nanowire-shaped spherical alumina with large aspect ratio and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] (1) Take 66g of aluminum isopropoxide, add it into 600ml of deionized water and stir until it is completely hydrolyzed, and then evaporate the isopropanol from the solution at 95°C. Add deionized water to 600g, add 6.2g acetic acid, and stir at 95°C for 0.5h.

[0023] (2) Transfer the obtained reaction mixture into a reaction kettle, seal it, perform a hydrothermal reaction at 150° C. for 6 hours, and obtain a sol after the reaction is completed and cooled to room temperature.

[0024] (3) Rotating the sol at 50° C. to prepare a boehmite sol with a mass fraction of 16.9% for use. The microstructure of the sol was observed by transmission electron microscopy, and the results were as follows: figure 1 shown. It can be seen that the boehmite sol has a one-dimensional nanowire microstructure with a diameter of 2-5 nm, a length of 100-2000 nm, and an aspect ratio of 20-1000.

[0025] (4) In the oleylamine column with a length of 1.5m and a diameter of 40mm, first add 8% a...

Embodiment 2

[0027] Al prepared by the method of embodiment 1 2 o 3 The difference is that the boehmite sol concentration is 25.8% in the step (3), and the diameter of the prepared bead is about 2.5mm, and the appearance is visible. image 3 ,From image 3 It can be seen from the figure that the outer surface of the pellets is smooth, spherical and uniform in particle size, and their physical properties are shown in Table 1.

Embodiment 3

[0029] Al prepared by the method of embodiment 1 2 o 3 Beads, the difference is that the boehmite sol concentration is 30.35% in the step (3), and the diameter of the made bead is about 3mm, and the outward appearance sees image 3 ,From image 3 It can be seen from the figure that the outer surface of the pellets is smooth, spherical and uniform in particle size, and their physical properties are shown in Table 1.

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Abstract

The invention discloses a nanowire-shaped spherical alumina with a large length-to-diameter ratio and a preparation method thereof. Using aluminum isopropoxide as raw material, boehmite sol is prepared by hydrolysis, and then hydrothermal reaction is carried out to obtain a nanowire boehmite sol precursor with large aspect ratio. Its diameter is 2‑5nm, length is 100‑2000nm, and aspect ratio is 20‑1000. The precursor is dropped into the oily ammonia column of the upper oil phase and the lower ammonia phase to form spherical gel particles, which are aged, dried, and roasted to obtain spherical alumina. The alumina is formed by agglomerating nanowires of the above specifications, has a high specific surface area, a regular mesoporous structure and high mechanical strength, and the size of the spherical particles is controllable, and can be used as a catalyst carrier. The molding process is simple and easy, the cost is low, and it can be mass-produced.

Description

technical field [0001] The invention relates to the technical field of preparation technology of spherical alumina, in particular to a preparation method of nanowire-shaped spherical alumina. Background technique [0002] Because of its large specific surface area, special pore structure, good adsorption and certain acidity, alumina is widely used in various fields such as catalysts, catalyst supports, adsorption, and ceramics. Alumina one-dimensional nanomaterials also have the characteristics of high elastic modulus, high dielectric constant, low magnetic permeability, high thermal conductivity and unique optical properties, and can be used for catalysts and catalyst supports, ceramic materials and composite material reinforcements. Therefore, the preparation of alumina nanomaterials, especially one-dimensional alumina nanomaterials, has become a research hotspot in the field of materials science. However, the preparation of one-dimensional alumina nanomaterials by the ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
CPCC01F7/02C01P2004/04C01P2006/12C01P2006/14C01P2006/16
Inventor 樊斯斯徐金铭黄延强张涛
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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