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Gamma-alumina nanofiber and preparation method thereof

A technology of alumina nanometer and aluminum hydroxide, which is applied in the preparation of alumina/hydroxide, alkali metal aluminate/alumina/aluminum hydroxide preparation, chemical instruments and methods, etc., can solve the problem of γ-alumina nanometer Small fiber pore volume, non-uniform supersaturation, low mixing efficiency, etc., to achieve the effect of improving uniformity of supersaturation, low cost, and easy operation

Active Publication Date: 2020-09-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low mixing efficiency of traditional reactors, the supersaturation of the solution system is not uniform, so the prepared γ-alumina nanofibers have small pore volume and low specific surface area.

Method used

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  • Gamma-alumina nanofiber and preparation method thereof
  • Gamma-alumina nanofiber and preparation method thereof
  • Gamma-alumina nanofiber and preparation method thereof

Examples

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preparation example Construction

[0030] The invention provides a method for preparing gamma-alumina nanofibers, comprising the following steps:

[0031] Dispersing the first dispersed phase solution in the mobile phase through the first membrane dispersion microreactor to obtain the dispersed phase solution;

[0032] Using the dispersed phase solution as the mobile phase, the second dispersed phase solution is dispersed in the dispersed phase solution through the second membrane dispersion microreactor, and a precipitation reaction is carried out to obtain an aluminum hydroxide suspension;

[0033] The aluminum hydroxide suspension is used as the mobile phase, and the dispersion process of the first dispersed phase solution and the second dispersed phase solution is circulated in sequence until the volume of the mobile phase increases to 3 to 5 times the initial value to obtain hydrogen Alumina precursor;

[0034] Aging and calcining the aluminum hydroxide precursor in sequence to obtain γ-alumina nanofibers...

Embodiment 1

[0056] Under the condition of 80°C, prepare an aqueous solution of aluminum sulfate with a molar concentration of 0.44mol / L and an aqueous solution of sodium metaaluminate with a molar concentration of 2.00mol / L. The flow rate is passed through the first membrane dispersion microreactor (the micropore diameter of the porous membrane used is 15 μm), and enters the mobile phase (300mL of pure water, flow rate is 244mL / min) of the communication pipeline to obtain the dispersed phase solution;

[0057] Using the dispersed phase solution as the mobile phase (the flow rate is 259mL / min), the sodium metaaluminate aqueous solution is passed through the second membrane dispersion microreactor (the pore diameter of the porous membrane used is 15 μm) with a flow rate of 21mL / min. In the phase, a precipitation reaction is carried out to obtain an aluminum hydroxide suspension (the temperature is 80° C., and the solid content is 5.2%);

[0058] With the aluminum hydroxide suspension as the...

Embodiment 2

[0065] Under the condition of 80°C, prepare an aqueous solution of aluminum sulfate with a molar concentration of 0.125 mol / L and an aqueous solution of sodium metaaluminate with a molar concentration of 0.50 mol / L. The flow rate is passed through the first membrane dispersion microreactor (the micropore diameter of the porous membrane used is 15 μm), and enters the mobile phase (pure water, volume is 300mL, and flow rate is 189mL / min) in the communication pipeline to obtain the dispersed phase solution;

[0066] With the dispersed phase solution as the mobile phase (the flow rate is 219mL / min), the sodium metaaluminate aqueous solution is passed through the second membrane dispersion microreactor (the pore diameter of the porous membrane used is 15 μm) with a flow rate of 26mL / min. In the phase, a precipitation reaction is carried out to obtain an aluminum hydroxide suspension (the temperature is 80° C., and the solid content is 1.4%);

[0067] With the aluminum hydroxide sus...

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Abstract

The invention provides a gamma-aluminum oxide nanofiber and a preparation method thereof, and belongs to the technical field of chemical material preparation. A dispersion phase in a dispersion phasesolution is dispersed into countless tiny and uniform liquid drops under the action of a microporous membrane through the first membrane dispersion micro-reactor and the second membrane dispersion micro-reactor which are connected in series, and the liquid drops enter a mobile phase channel; the method has great mass transfer efficiency and is complete in reaction of the mobile phase and the dispersion phase; according to the method, the supersaturation degree uniformity in a reaction system can be effectively improved, in the circulation process with aluminum hydroxide turbid liquid as a mobile phase, a solid phase in the mobile phase can promote heterogeneous nucleation, a new phase is attached to the surfaces of existing particles, anisotropic fibrous gamma-aluminum oxide is generated,and then the macropore proportion of the fibrous gamma-aluminum oxide is increased. The result of the embodiment shows that the stacking density of the prepared gamma-aluminum oxide nanofiber is 0.16-0.23 g / cm3, the specific surface area is 285-570 m2 / g, and the pore volume is 1.2-1.92 cm3 / g.

Description

technical field [0001] The invention relates to the technical field of chemical material preparation, in particular to a gamma-alumina nanofiber and a preparation method thereof. Background technique [0002] γ-alumina is a very important functional inorganic material, which has high thermal stability, chemical stability, high specific surface area and adsorption capacity, and is widely used as adsorption material, catalyst and catalyst carrier. In the petrochemical industry, γ-alumina can be used as a catalyst carrier for catalytic cracking, catalytic reforming, hydrotreating, hydroisomerization, residue hydrogenation, and low-carbon hydrocarbon dehydrogenation, especially for catalytic cracking and slag Oil hydrogenation process requires alumina support with high pore volume and high specific surface area. The γ-alumina crystals mainly have two forms: fibrous and granular. The fibrous alumina grown along a certain crystal plane has a smaller packing density, larger pore v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/14C01F7/30B01J19/00B82Y30/00B82Y40/00
CPCB01J19/0093B82Y30/00B82Y40/00C01F7/02C01F7/14C01F7/30C01P2004/04C01P2004/16C01P2004/64C01P2006/12
Inventor 王玉军于志远骆广生
Owner TSINGHUA UNIV
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