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Preparation method of Gamma alumina fiber

A technology of alumina fiber and fiber, which is applied in the field of preparation of Gamma alumina fiber, can solve the problems of unsuitable catalyst carrier, low activity, low specific surface area, etc., achieve high specific surface area, high specific surface activity, and simple technical route Effect

Active Publication Date: 2021-11-09
成都海鑫高科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, alumina fibers have a form of alfa phase on the micron scale. This form of alumina fibers only has a low specific surface area and low activity, so it is not suitable for use as a catalyst carrier.

Method used

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  • Preparation method of Gamma alumina fiber
  • Preparation method of Gamma alumina fiber
  • Preparation method of Gamma alumina fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Gamma alumina fibers sintered in hydrogen

[0036] (1) in deionized water was added Al (NO 3 ) 3 Analytical grade, prepared at a concentration of the aqueous solution of 3mol L / ; Transfer 500 ml of solution, and then 20 g of urea and 20 g of polyethylene glycol, dissolved dispersed by mechanical agitation into the ultrasonic instrument; until the solution became clear and transparent after allowed to stand in air for 12 hours standby; the solution was poured into water after heat aging vessel, one-fifth of retained voids, capped and tightened; hot water kettle was placed in a drying oven to heating rate 2 ℃ / min heating to 280 deg.] C, and then incubated at this temperature for 120 hours, then the power is off, the water in the autoclave and then cooled.

[0037] (2) hot water tank is opened, pouring the reaction solution was not clear and transparent, the white precipitate was poured into a suction funnel vacuum filtration, and washed with deionized water until no odor o...

Embodiment 2

[0042] Gamma alumina fibers sintered in acetylene

[0043] (1) in deionized water was added Al (NO 3 ) 3 AR, formulated at a concentration of 10mol L aqueous / ; Transfer 500 ml of solution, and then 50 g of urea and 100 grams of polyethylene glycol, by mechanically stirring the dispersed and dissolved into a sonicator; until the solution became clear and transparent after allowed to stand in air for 12 hours standby; the solution was poured into water after heat aging vessel, one-fifth of retained voids, capped and tightened; hot water kettle was placed in a drying oven to heating rate 2 ℃ / min heating to 200 ℃, then incubated for 48 hours at this temperature, then turn off the power, the water in the autoclave and then cooled.

[0044](2) Open the heating kettle, pour out the clear and transparent unreacted solution, pour the white precipitate into the suction funnel for vacuum filtration, and use deionized water to clean until there is no obvious ammonia odor; Filtered fiber pr...

Embodiment 3

[0049] Sintered Gamma alumina fibers in methane

[0050] (1) Add Al (NO) in deionized water 3 ) 3 The analysis was purified, the concentration of 5 mol / L was prepared; 500 ml of solution was added, then 40 g of urea and 10 grams of polyethylene glycol were added, and the dispersion dissolved in the ultrasound meter after mechanical stirring; after the solution became clear and transparent Stand for 12 hours in the air; pour the aged solution into the water heater, retain one-fifth of the gap, cover the cover and tighten; put the hydrotherm into the blast drying tank, The temperature rise rate of 2 ° C / min was heated to 250 ° C, and then the temperature was held for 240 hours, then the power is turned off, and the hydrothelin is cooled with the furnace.

[0051] (2) Open the heating kettle, pour out the clear and transparent unreacted solution, pour the white precipitate into the suction funnel for vacuum filtration, and use deionized water to clean until there is no obvious am...

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Abstract

The invention discloses a preparation method of a Gamma alumina fiber. The preparation method specifically comprises the following steps: uniformly mixing aluminum nitrate, urea and polyethylene glycol according to a ratio to prepare an aqueous solution, placing in a high temperature hydrothermal kettle, carrying out thermal insulation at 200-280 DEG C for 48-240 h, filtering, drying and screening the precipitation product to obtain fine particle precursor powder; carrying out high-temperature heat treatment in a high-temperature tube furnace under the protection of hydrogen and the like, and carrying out heat treatment at 700-1300 DEG C for 120-240 hours to obtain Gamma alumina fibers; and carrying out ball-milling crushing and sieving to obtain the Gamma alumina fiber with uniform granularity, high length-diameter ratio and pure white color. The Gamma alumina fiber prepared by the method has low apparent density, high length-diameter ratio and high specific surface area; the method is simple in process, low in cost and easy to realize industrial production, and has important application prospects in the fields of petrochemical engineering and fine catalysis.

Description

Technical field [0001] The present invention belongs to the technical field of new materials, in particular, relates to a method for preparing Gamma alumina fibers. Background technique [0002] Gamma-alumina (γ-Al 2 O 3 ) Is a compound of aluminum oxide of cubic crystal, a metastable material having a very high activity; it is a porous material, up to several hundred square meters of surface area, strong adsorption capacity, it is widely used in petrochemical as adsorbents and catalyst supports, as a laboratory medium strong desiccants, and transformer oil as an industrial turbine oil deacidification and the like. [0003] Gamma alumina morphology of current commercial nanoparticulate, hollow sphere or nano-whiskers, nano-size are controlled, as a catalyst carrier in not constitute a valid multi-scale three-dimensional frame structure, affect the catalytic effect. In published papers, not yet related to the preparation of micron-sized Gamma alumina fibers; already in Patent appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/62236C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/77C04B2235/94C04B2235/95Y02P20/52
Inventor 文力
Owner 成都海鑫高科技有限公司
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