A kind of preparation method of γ-alumina powder material coated with silicon dioxide nanometer layer

A technology of alumina powder and silica, used in chemical instruments and methods, catalyst carriers, catalysts for physical/chemical processes, etc., can solve the problem of time-consuming and labor-intensive treatment of liquid waste, reduction of material specific surface area, uneven dispersion of additives, etc. problem, to achieve the effects of low cost, improved thermal stability, and simple method operation

Inactive Publication Date: 2016-07-20
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is likely to lead to uneven dispersion of additives and γ-Al 2 o 3 The agglomeration of the powder leads to a decrease in the specific surface area of ​​the material; while the chemical co-precipitation method uses a liquid solution as the mixing medium, and the powder prepared by the precipitation method needs subsequent drying treatment
Not only does this lead to lengthy steps, but liquid waste disposal is also time-consuming and labor-intensive

Method used

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  • A kind of preparation method of γ-alumina powder material coated with silicon dioxide nanometer layer
  • A kind of preparation method of γ-alumina powder material coated with silicon dioxide nanometer layer
  • A kind of preparation method of γ-alumina powder material coated with silicon dioxide nanometer layer

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Effect test

Embodiment 1

[0022] The preparation method of the gamma-alumina powder material coated with silica nano-layer provided by the present invention, the preparation steps are as follows:

[0023] (1) Use γ-Al 2 o 3 The purity of the powder is 95%, the particle size is 100nm, and the γ-Al 2 o 3 After the powder is dried, it is sieved, the drying temperature is 150°C, and it is dried for 5 hours. The size of the sieve hole is 200 mesh, and it is sieved three times; 2 o 3 The powder is placed in the chemical vapor deposition reaction chamber, vacuumed to 5Pa, and preheated to 400°C;

[0024] (2) Using ethyl orthosilicate as raw material, heat until the temperature reaches 80°C, and the reaction chamber starts to rotate at a rotation rate of 30r / min;

[0025] (3) Feed raw materials, argon and oxygen into the reaction chamber, wherein the flow rate of argon gas is 30sccm, and the flow rate of oxygen gas is 20sccm, then adjust the pressure in the reaction chamber, the pressure is 500Pa, and the...

Embodiment 2

[0029] The preparation method of the gamma-alumina powder material coated with silica nano-layer provided by the present invention, the preparation steps are as follows:

[0030] (1) Use γ-Al 2 o 3 The purity of the powder is 96%, the particle size is 1 μm, and the γ-Al 2 o 3 After the powder is dried, it is sieved, the drying temperature is 150°C, and it is dried for 7 hours. The size of the sieve hole is 200 mesh, and it is sieved three times; 2 o 3 The powder is placed in the chemical vapor deposition reaction chamber, vacuumed to 10Pa, and preheated to 500°C;

[0031] (2) Using tetraethyl orthosilicate as raw material, heat until the temperature reaches 90°C, and the reaction chamber starts to rotate at a rotation rate of 45r / min;

[0032] (3) Pass raw materials, argon and oxygen into the reaction chamber, wherein the flow rate of argon gas is 40 sccm, and the flow rate of oxygen gas is 10 sccm, then adjust the pressure in the reaction chamber, the pressure is 500 Pa,...

Embodiment 3

[0036] The preparation method of the gamma-alumina powder material coated with silica nano-layer provided by the present invention, the preparation steps are as follows:

[0037] (1) Use γ-Al 2 o 3 The purity of the powder is 98%, the particle size is 10 μm, and the γ-Al 2 o 3 After the powder is dried, it is sieved, the drying temperature is 150°C, and it is dried for 8 hours. The size of the sieve hole is 100 mesh, and it is sieved three times; 2 o 3 The powder is placed in the chemical vapor deposition reaction chamber, vacuumed to 15Pa, and preheated to 500°C;

[0038] (2) Using tetraethyl orthosilicate as raw material, heat until the temperature reaches 90°C, and the reaction chamber starts to rotate at a rotation rate of 60r / min;

[0039] (3) Pass raw materials, argon and oxygen into the reaction chamber, wherein the flow rate of argon gas is 40 sccm, and the flow rate of oxygen gas is 10 sccm, then adjust the pressure in the reaction chamber, the pressure is 800 Pa...

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Abstract

A method for preparing a γ-alumina powder material coated with a silicon dioxide nano-layer, which relates to the field of material engineering. 2 Precursors are used as raw materials, and argon and oxygen are passed through SiO 2 The thermal decomposition of the precursor coats a layer of SiO on the surface of γ-alumina powder 2 After the nano layer is coated, it is cooled to room temperature, taken out, and sieved. The preparation method of the γ-alumina powder material coated with a silicon dioxide nano-layer provided by the invention is to coat SiO on the surface of the γ-alumina powder by chemical vapor deposition technology. 2 nanometer layer, thereby improving the thermal stability of the γ-alumina powder structure, increasing the phase transition temperature of the γ-alumina powder, and thus preparing a γ-alumina powder material. The method is simple to operate, low in cost, and suitable for large scale commercial applications.

Description

technical field [0001] The invention belongs to the field of powder surface treatment in material processing engineering, and in particular relates to a γ-Al material for preparing high-temperature stable catalytic powder materials 2 o 3 method of preparation. Background technique [0002] γ-Al 2 o 3 Because of its specific surface and high dispersion, it is often used as a carrier for automobile exhaust purification catalysts. When used as a catalyst carrier, γ-Al 2 o 3 It does not participate in the reaction itself, but only dilutes, supports and disperses precious metals for the reacting substances. In addition, γ-Al 2 o 3 It also has the function of enhancing the thermal and mechanical stability of the catalyst. The device for placing the catalyst (catalytic converter) is generally installed near the exhaust port of the automobile engine, and it often withstands a high temperature of about 1000°C for an instant. When the car engine is burning, if there is a mis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/12B01J32/00C09C1/40C09C3/06
Inventor 张建峰吴玉萍洪晟李改叶郭文敏
Owner HOHAI UNIV
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