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Mesoporous alumina and preparation method thereof

A technology of mesoporous alumina and alumina, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of insufficient specific surface area and complicated preparation methods, and achieve the effects of low cost, simple preparation process, and increased added value

Active Publication Date: 2015-07-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​the mesoporous alumina prepared by the prior art is not large enough to meet the existing needs, or the preparation method is complicated.

Method used

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  • Mesoporous alumina and preparation method thereof
  • Mesoporous alumina and preparation method thereof
  • Mesoporous alumina and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The preparation method of mesoporous alumina, its specific process steps and conditions are as follows:

[0071] (1) Roast the ball-milled coal gangue at 800°C, then mix it with HCl solution with a concentration of 6mol / L at a solid-to-liquid ratio of 1:4.5 (g / ml or kg / L), stir and reflux at 90°C for 2 hours, Filtrate is collected by filtration;

[0072] (2) Measure 30ml of the filtrate collected in step (1), add excess 6.0mol / L NaOH solution until the Al(OH) 3 Precipitation disappears and complete conversion to NaAlO 2 , filter to remove insoluble impurities, and collect the filtrate for subsequent use;

[0073] (3) Add 6.0mol / L HCl solution to the filtrate collected in step (2) to adjust the pH close to neutral, so that NaAlO 2 Completely converted to boehmite precipitation, filtered and washed until neutral and NaCl-free, and the filter cake was collected as an aluminum source for the preparation of mesoporous alumina;

[0074] (4) Dilute the filter cake, Triton ...

Embodiment 2

[0078] The preparation method of mesoporous alumina, its specific process steps and conditions are as follows:

[0079] (1) Roast the ball-milled coal gangue at 800°C, then mix with 9mol / L HCl solution at a solid-to-liquid ratio of 1:3.0, stir and reflux at 90°C for 2 hours, and collect the filtrate by filtration;

[0080] (2) Measure 30ml of the filtrate collected in step (1), add excess 6.0mol / L KOH solution until the Al(OH) 3 The precipitate disappeared and completely converted to KAlO 2 , filter to remove insoluble impurities, and collect the filtrate for subsequent use;

[0081] (3) Add 6.0mol / L H to the filtrate collected in step (2) 2 SO 4 solution, adjust the pH close to neutral, so that KAlO 2 Completely converted to boehmite precipitate, filtered and washed to neutral and K-free 2 SO 4 , collecting the filter cake as an aluminum source for the preparation of mesoporous alumina;

[0082] (4) Dilute the filter cake, Triton X-100 and deionized water by 1 (with Al...

Embodiment 3

[0086] The preparation method of mesoporous alumina, its specific process steps and conditions are as follows:

[0087] (1) Roast the ball-milled coal gangue at 900°C, then mix with 6mol / L HCl solution at a solid-to-liquid ratio of 1:4.5, stir and reflux at 90°C for 2 hours, and collect the filtrate by filtration;

[0088](2) Measure 30ml of the filtrate collected in step (1), add excess 6.0mol / L NaOH solution until the Al(OH) 3 Precipitation disappears and complete conversion to NaAlO 2 , filter to remove insoluble impurities, and collect the filtrate for subsequent use;

[0089] (3) Add 6.0mol / L HNO to the filtrate collected in step (2) 3 solution, adjust the pH close to neutral, so that NaAlO 2 Completely converted to precipitate, filter and wash the filter cake to be free of NaNO 3 , collecting the filter cake as an aluminum source for the preparation of mesoporous alumina;

[0090] (4) Dilute the filter cake, Triton X-100 and deionized water by 1 (with Al in the pick...

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Abstract

The invention relates to a preparation method of a mesoporous alumina The preparation method comprises the following steps of: removing impurities of a mineral resource containing alumina; transforming the alumium into meta-aluminate, separating from impurity ions, and regulating a pH value by an acid, so the meta-aluminate is turned into a boehmite precipitate; filtering and collecting the precipitate and taking as an aluminum source; mixing the obtained boehmite precipitate with a template agent and water in the ratio of 1: (0.02-0.5): (20-70) by amounts of the materials, regulating the pH value to 3-10, and aging for at least 6h at 20-120 DEG C, wherein the template agent is triton X-100 and / or cetyl trimethyl ammonium bromide (CTAB); removing impurities of the aged mixture, to obtain a solid product; and baking for at least 1.5h at 450-950 DEG C, to obtain the mesoporous alumina. The preparation method disclosed by the invention has the characteristics that the operation is simple; the iron-free mesoporous alumina is prepared under a moderate condition by adding an iron removal process in the preparation process; and the mesoporous alumina can maintain the mesoporous structure after being baked, and has comparatively high specific surface area.

Description

technical field [0001] The invention relates to the field of preparation of inorganic materials, in particular, the invention relates to a mesoporous alumina and a preparation method thereof. Background technique [0002] Mesoporous alumina has high specific surface area, narrow pore size distribution and uniform pore channel, so it is widely used as adsorbent, catalyst and catalyst carrier. At present, there are many patents and literature reports on the preparation of mesoporous alumina, such as CN102219242A, CN101024503A, CN 101993102A, CN 101597077A, CN102219243A all use inorganic aluminum salts as aluminum salt sources such as aluminum nitrate, aluminum chloride and aluminum sulfate, Prepare mesoporous alumina with P123, polyethylene glycol 1540, methylcellulose, amino acid surfactant and glucose as template respectively; CN101829552A uses aluminum nitrate as aluminum source and CTAB as template to prepare mesoporous alumina, It uses an organic solvent, which has high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/30
Inventor 卢旭晨潘锋王体壮闫岩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI