High-specific-surface-area hierarchical porous gamma-AlOOH hollow microspheres and preparation method and application of hollow microspheres

A hierarchical porous and hollow microsphere technology, applied in chemical instruments and methods, other chemical processes, alumina/aluminum hydroxide, etc., can solve problems such as unfavorable industrial production

Inactive Publication Date: 2014-02-19
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods also have the disadvantage of introducing organic structure regulators, which is unfavorable for industrialized production.

Method used

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  • High-specific-surface-area hierarchical porous gamma-AlOOH hollow microspheres and preparation method and application of hollow microspheres
  • High-specific-surface-area hierarchical porous gamma-AlOOH hollow microspheres and preparation method and application of hollow microspheres
  • High-specific-surface-area hierarchical porous gamma-AlOOH hollow microspheres and preparation method and application of hollow microspheres

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) In 35mL aqueous solution of aluminum potassium sulfate, add urea, stir until completely dissolved, then transfer this solution into a microwave hydrothermal reaction kettle for microwave hydrothermal reaction to obtain a microwave hydrothermal product; the aluminum potassium sulfate The molar concentration is 0.05mol / L, the molar ratio of urea to aluminum potassium sulfate is 2:1, the microwave hydrothermal reaction temperature is 180°C, and the reaction time is 10min;

[0033] (2) The microwave hydrothermal product obtained in step (1) is cooled, centrifuged, washed repeatedly with water until neutral, then washed with alcohol and centrifuged, and then dried in an oven at 80°C for 8 hours to obtain a high-ratio Surface integral grade porous γ-AlOOH hollow microspheres; the diameter of the hollow microspheres is between 600nm and 1000nm, and its reproducibility is good.

Embodiment 2

[0035] (1) In 35mL aqueous solution of aluminum potassium sulfate, add urea, stir until completely dissolved, then transfer this solution into a microwave hydrothermal reaction kettle for microwave hydrothermal reaction to obtain a microwave hydrothermal product; the aluminum potassium sulfate The molar concentration is 0.05mol / L, the molar ratio of urea to aluminum potassium sulfate is 2:1, the microwave hydrothermal reaction temperature is 180°C, and the reaction time is 20min;

[0036] (2) The microwave hydrothermal product obtained in step (1) is cooled, centrifuged, washed repeatedly with water until neutral, then washed with alcohol and centrifuged, and then dried in an oven at 80°C for 8 hours to obtain a high-ratio Surface integral grade porous γ-AlOOH hollow microspheres; the diameter of the hollow microspheres is between 600nm and 1000nm, and its reproducibility is good.

Embodiment 3

[0038] (1) In 35mL aqueous solution of aluminum potassium sulfate, add urea, stir until completely dissolved, then transfer this solution into a microwave hydrothermal reaction kettle for microwave hydrothermal reaction to obtain a microwave hydrothermal product; the aluminum potassium sulfate The molar concentration is 0.05mol / L, the molar ratio of urea to aluminum potassium sulfate is 2:1, the microwave hydrothermal reaction temperature is 180°C, and the reaction time is 30min;

[0039] (2) The microwave hydrothermal product obtained in step (1) is cooled, centrifuged, washed repeatedly with water until neutral, then washed with alcohol and centrifuged, and then dried in an oven at 80°C for 8 hours to obtain a high-ratio Surface integral grade porous γ-AlOOH hollow microspheres; the diameter of the hollow microspheres is between 600nm and 1000nm, and its reproducibility is good.

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Abstract

The invention relates to high-specific-surface-area hierarchical porous gamma-AlOOH hollow microspheres and a preparation method and an application of the hollow microspheres, and belongs to the technical field of inorganic nonmetallic materials. The preparation method of the microspheres comprises the steps as follows: a mixed solution of aluminium potassium sulfate and urea is subjected to a microwave hydrothermal reaction, so that the high-specific-surface-area hierarchical porous gamma-AlOOH hollow microspheres are obtained; and the mixed solution is calcinated again, so that high-specific-surface-area hierarchical porous gamma-Al2O3 hollow microspheres are obtained. Both the gamma-AlOOH hollow microspheres and the gamma-Al2O3 hollow microspheres are all hierarchical porous cauliflower-shaped hollow microspheres, the diameters range between 600 nm and 1000 nm, and the specific surface areas are large; the rate of adsorption rate to Congo red in the solution is high, the adsorption capacity is large, and the microspheres can be used repeatedly; and at the same time, the microspheres have a good effect of adsorbing formaldehyde in indoor air. According to the method, a synthetic route is simple, the reaction time is short, raw materials are easy to obtain, the reproducibility of the hollow microspheres is good, and the hollow microspheres are applicable to industrial production.

Description

technical field [0001] The invention relates to a graded porous γ-AlOOH hollow microsphere with high specific surface area and its preparation method and application, belonging to the technical field of inorganic non-metallic materials. Background technique [0002] γ-AlOOH, also known as boehmite or boehmite, is the main precursor for the preparation of activated alumina. It has a large specific surface area and pore distribution, and can be used as a carrier for adsorbents and catalysts. Calcining γ-AlOOH at 400~700℃, the product obtained is γ-Al 2 o 3 . Nano γ-Al 2 o 3 With the advantages of high specific surface area, moderate pore distribution and good mechanical strength, it can meet the requirements of high selectivity and high reactivity of catalysts, and is widely used as catalysts in automobile exhaust purification, catalytic combustion, petroleum refining, etc. and its carrier. γ-AlOOH to γ-Al 2 o 3 The morphology of the structure plays a decisive role, us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B01J20/08
Inventor 聂龙辉
Owner HUBEI UNIV OF TECH
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