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Porous alumina nanofiber and preparation method thereof

A porous alumina and nanofiber technology, applied in nanotechnology, inorganic raw material rayon and other directions, can solve the problems of high cost, unfriendly environment, low alumina pore volume, etc., achieve low cost, reduce production cost, prepare simple steps

Active Publication Date: 2019-11-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Our team invented a green process for synthesizing basic aluminum ammonium carbonate and its pyrolysis to prepare alumina with high specific surface area (CN109292802 A), but the pore volume of alumina prepared by this method is relatively low, which limits its application in hydrofining Applications
[0006] The patent (CN103911686) uses aluminum nitrate and urea to synthesize basic aluminum ammonium carbonate fiber with the assistance of an organic template. This method is costly due to the use of the template, and the environment is not friendly, which is not conducive to industrial production

Method used

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  • Porous alumina nanofiber and preparation method thereof
  • Porous alumina nanofiber and preparation method thereof
  • Porous alumina nanofiber and preparation method thereof

Examples

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preparation example Construction

[0032] The invention provides a method for preparing porous alumina nanofibers, comprising the following steps:

[0033] (1) Mix active aluminum hydroxide, modifier and water for hydrothermal crystallization, and obtain alumina precursor and hydrothermal crystallization mother liquor after solid-liquid separation;

[0034] (2) Calcining the alumina precursor to obtain porous alumina nanofibers.

[0035] The invention mixes active aluminum hydroxide, a modifying agent and water for hydrothermal crystallization, and obtains an alumina precursor and a hydrothermal crystallization mother liquor after solid-liquid separation. In the present invention, the activated aluminum hydroxide is obtained by activating aluminum hydroxide through an activation atmosphere; the activation atmosphere preferably includes one or more of hydrogen, oxygen, nitrogen, air, carbon dioxide, argon and helium; The activation temperature is preferably 100-800° C., more preferably 200-400° C., and the acti...

Embodiment 1

[0045] At room temperature, prepare a biuret solution with a mass fraction of 30%, and then add activated aluminum hydroxide powder according to the molar ratio of biuret to Al of 10:1 (activate aluminum hydroxide at 100°C for 5h under a nitrogen atmosphere), Stir evenly, transfer to a crystallization kettle, crystallize at 80°C for 14 hours, suction filter and wash the solid obtained after crystallization, and dry at 80°C for 12 hours to obtain an alumina fiber precursor, which is designated as A-1, The mother liquor obtained after crystallization is recorded as mother liquor (1). The obtained A-1 specific surface area is 505.4m 2 / g, the pore volume is 2.7cm 3 / g.

[0046] The obtained A-1 solid was heated up to 650°C at a heating rate of 2°C / min in an air atmosphere, and then roasted at a constant temperature for 6 hours to obtain porous alumina nanofibers, denoted as Al 2 o 3 -1, the specific surface area is 318.3m 2 / g, the pore volume is 2.10cm 3 / g.

Embodiment 1-1

[0048] Add biuret to the mother liquor (1) obtained in Example 1, then add the same amount of active aluminum hydroxide powder as in Example 1 (aluminum hydroxide is activated at 150° C. for 4 h under a carbon dioxide atmosphere) and water, and stir evenly. Wherein the molar ratio of added biuret to Al in added activated aluminum hydroxide is 4:1, and the molar ratio of added water to added Al in activated aluminum hydroxide is 20~30:1; Crystallize in a crystallization kettle at 130°C for 12 hours, filter and wash the solid after crystallization, and dry at 100°C for 12 hours to obtain a nanofibrous alumina precursor, which is denoted as A-1-1, and the crystallized The mother liquor is recorded as mother liquor (2). The obtained A-1-1 specific surface is 325.9m 2 / g, the pore volume is 1.42cm 3 / g.

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Abstract

The invention relates to the technical field of nanofibers and provides a porous alumina nanofiber and a preparation method thereof. aluminum hydroxide is used as an aluminum source, an ammonium saltor an amide compound is used as a modifier, an alumina precursor is prepared through hydrothermal crystallization of the activated aluminum hydroxide and the modifier; the porous alumina nanofiber isprepared by calcining the alumina precursor. The preparation method provided herein has simple steps and low cost; a hydrothermal crystallization mother liquor is reusable; no wastewater is discharged; energy is saved, and the environment is protected; the preparation method is green and is suitable for industrial production. The industrial aluminum hydroxide low in price and easy to attain is used as one aluminum source which helps further reduce the production cost as compared to a soluble aluminum salt; the alumina precursor prepared herein has specific surface area up to 505.4 m<2> / g and pore volume up to 2.70 cm<3> / g; after being calcined, the porous alumina nanofiber has specific surface area up to 318.3 m<2> / g and pore volume up to 2.10 cm<3> / g.

Description

technical field [0001] The invention relates to the technical field of nanofiber materials, in particular to a porous alumina nanofiber and a preparation method thereof. Background technique [0002] Alumina is widely used in catalysts, catalyst supports, adsorbents or composite materials due to its high specific surface area, abundant pores and excellent chemical properties. Hydrofinishing is one of the important means to improve the quality of oil products. Hydrofinishing can reduce the impurity content of raw oil. In the process of hydrorefining, alumina is often used as a catalyst carrier, and alumina has a rich pore structure, thereby improving catalytic activity and selectivity. [0003] With the decline of crude oil quality, alumina with large pore volume has attracted the attention of the petrochemical industry. The large pore volume will reduce the internal diffusion resistance of heavy oil macromolecules, and can also improve the activity and selectivity of cataly...

Claims

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Application Information

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IPC IPC(8): D01F9/08B82Y40/00
CPCB82Y40/00D01F9/08
Inventor 白鹏衣启松吴萍萍阎子峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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