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Porous aluminium oxide micro/nanospheres and preparation method thereof

A technology of porous alumina and micro-nano balls, applied in the field of nano-materials, can solve problems such as complicated operation process and difficult control

Inactive Publication Date: 2013-12-18
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The preparation of inorganic hollow spheres is mainly based on metal oxides and metals. Moreover, most of the previous work is difficult to control, and the operation process is generally complicated, which limits their application to a large extent.
There are few reports on the synthesis of alumina core-shell and hollow spheres

Method used

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  • Porous aluminium oxide micro/nanospheres and preparation method thereof
  • Porous aluminium oxide micro/nanospheres and preparation method thereof
  • Porous aluminium oxide micro/nanospheres and preparation method thereof

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preparation example Construction

[0024] The embodiment of the present invention provides a method for preparing porous alumina micro-nanospheres with simple process and easy controllable conditions. The process flow of the preparation method of the porous alumina micro-nanospheres is as follows: figure 1 shown, including the following steps:

[0025] Step S01. Prepare a mixed emulsion of emulsifier, n-hexane, and sodium aluminate aqueous solution: mix the emulsifier, n-hexane, and sodium aluminate aqueous solution and perform emulsification treatment to prepare a mixed emulsion; wherein, the emulsifier, n-hexane, aluminum The dosage ratio of sodium acid is 0.5g: 10-40mL: 1.0-5.0g;

[0026] Step S02. Precipitation of basic ammonium aluminum carbonate: add the mixed emulsion prepared in step S01 to an aqueous ammonium bicarbonate solution with a concentration of 0.9-1.0 mol / L for precipitation reaction, perform solid-liquid analysis after the reaction is completed, wash and dry Precipitation, obtain basic alu...

Embodiment 1

[0047] A porous alumina micro-nanosphere and a preparation method thereof. The preparation method is as follows:

[0048] (1) Add 0.5g Span80 to 18mL1.0mol / L sodium aluminate solution, then add 36mL n-hexane, emulsify at 10000rpm / min with a high-speed emulsifier for at least 1min, and prepare a mixed emulsion;

[0049] (2) Add the mixed emulsion prepared in step (1) to the pre-prepared 0.94mol / L NH 4 HCO 3 In the solution, stirring was continued at 500 rpm / min for 3 h. After the reaction was complete, the product was repeatedly washed four times with deionized water and absolute ethanol, and finally dried in a drying oven at 60°C for 12 hours to obtain a white precipitated product.

[0050] (3) Put the white precipitate product prepared in step (2) in a porcelain crucible and directly heat it to 600°C in a muffle furnace at a heating rate of 10°C / min for 5 hours, then place the prepared sample in air naturally After cooling to room temperature, porous alumina micro-nanosph...

Embodiment 2

[0058] A porous alumina micro-nanosphere and a preparation method thereof. The preparation method is as follows:

[0059] (1) Add 0.5g of Span80 to 20mL of 2.0mol / L sodium aluminate solution, then add 40mL of n-hexane, and emulsify with a high-speed emulsifier at a speed of 10000rpm / min for at least 1min to prepare a mixed emulsion;

[0060] (2) Add the mixed emulsion prepared in step (1) into the pre-prepared 1.0mol / L NH 4 HCO 3 In the solution, stirring was continued at 500 rpm / min for 3 h. After the reaction was complete, the product was washed repeatedly four times with deionized water and absolute ethanol, and finally dried in a drying oven at 60° C. for 12 hours to obtain a white precipitated product.

[0061] (3) Put the white precipitate product prepared in step (2) in a porcelain crucible and directly heat it to 600°C in a muffle furnace at a heating rate of 15°C / min for 5 hours, then place the prepared sample in the air naturally After cooling to room temperature...

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Abstract

The invention discloses a porous aluminium oxide micro / nanosphere and a preparation method thereof. The preparation method of the porous aluminium oxide micro / nanospheres comprises the steps of mixing an emulsifier, normal hexane and the aqueous solution of sodium aluminate together and then carrying out emulsifying treatment on the mixed solution to prepare a mixed emulsion, preparing ammonium aluminum carbonate basic precipitate and performing heat treatment on the ammonium aluminum carbonate basic precipitate to prepare the porous aluminium oxide micro / nanospheres. The preparation method of the porous aluminium oxide micro / nanospheres is characterized in that hollow or solid micro / nanospheres with an ammonium aluminum carbonate porous structure are prepared successfully in a W / O / W emulsion system with the aqueous solution of sodium aluminate as an aluminium source and ammonium bicarbonate as a precipitator, and then the heat treatment is performed on the hollow or solid micro / nanospheres to obtain hollow or solid micro / nanospheres with an aluminium oxide porous structure. The preparation method is simple in process, easily controllable in condition, low in requirements for equipment and suitable for batch production. The prepared porous aluminium oxide micro / nanospheres are hollow and solid spheroidal particles with a porous structure; with the porous structure, the porous aluminium oxide micro / nanospheres are large in specific surface area, good in stability and excellent in surface infiltration capacity.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a porous alumina micronanosphere and a preparation method thereof. Background technique [0002] Compared with bulk materials, nanomaterials (especially hollow structures) have the characteristics of low density, high specific surface area, good stability, strong surface permeability and special optical properties, so they have become one of the attractive directions in the field of material research. one. The alumina hollow structure has a hollow structure with a large specific surface area, which can adsorb and fill particles, and its chemical stability is high, especially when its size is reduced to the nanometer scale, because of its large specific surface area and pore size, activity High, can significantly improve catalytic efficiency, as a packaged very small reactor, widely used in catalytic cracking of heavy oil macromolecules, heterogeneous cata...

Claims

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Application Information

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IPC IPC(8): C01F7/30B82Y30/00
Inventor 刘白刘力睿
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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