Fibrous mesoporous alumina and preparation method thereof

A technology of mesoporous alumina, which is applied in the field of batch synthesis of fibrous mesoporous alumina, can solve the problems of unsuitability for industrialization, complex operating conditions, and low production cost, and achieve low production cost, simple process, and large specific surface area. Effect

Inactive Publication Date: 2011-08-17
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the disadvantages of complex operating conditions and unsuitability for industrialization in the prior art, the present invention discloses a fibrous meso

Method used

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  • Fibrous mesoporous alumina and preparation method thereof
  • Fibrous mesoporous alumina and preparation method thereof
  • Fibrous mesoporous alumina and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1～4

[0029] At 343 K, 2.32 g of polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (P123) was dissolved in 50 mL of aluminum nitrate aqueous solution (0.5 mol / L). Under stirring, 150 mL of ammonium carbonate aqueous solution (0.5 mol / L) was added dropwise, and stirred evenly. The obtained inorganic aluminum precipitates were aged at 343 K for 0 h, 6 h, 12 h and 18 h, respectively. The resulting product was washed and filtered with hot water until neutral, and dried at 323 K to obtain an inorganic aluminum precursor. The precursor was calcined at 773 K for 4 h to obtain alumina powder. The samples are labeled A-3-0h, A-3-6h, A-3-12h and A-3-18h, respectively. The resulting inorganic aluminum precursor is characterized by XRD (see figure 1 ). The results showed that with the increase of aging time, the crystal phase of the inorganic aluminum precursor changed from Gibbsite to ammonium aluminum carbonate (NH 4 Al(OH) 2 CO 3 ). Combined with SEM characterization,...

Embodiment 5～8

[0031] The implementation method is the same as in Example 4, except that the addition amount of ammonium carbonate aqueous solution (0.5 mol / L) is 100 mL, 200 mL, 300 mL and 400 mL respectively. When the ammonium carbonate aqueous solution was added in an amount of 100 mL, the crystal phase of ammonium aluminum carbonate could not be obtained, nor could the fibrous morphology be formed. When the addition amount of ammonium carbonate aqueous solution is 200 mL, 300 mL and 400 mL, the crystal phase of ammonium aluminum carbonate can be obtained, and the fibrous morphology can be formed at the same time.

Embodiment 9～13

[0033] At 343 K, no surfactant is added or the ratio of aluminum nitrate to surfactant (molar ratio) is 1:0.02, the surfactant cetyltrimethylammonium bromide, sodium lauryl sulfate And polyethylene glycol 2000 and a mixture of cetyltrimethylammonium bromide and sodium lauryl sulfate (molar ratio 1:1) were dissolved in 50 mL of aluminum nitrate aqueous solution (0.5 mol / L). Under stirring, 150 mL of ammonium carbonate aqueous solution (0.5 mol / L) was added dropwise, and stirred evenly. The obtained inorganic aluminum precipitate was aged at 343 K for 18 h. The resulting product was washed and filtered with hot water until neutral, and dried at 323 K to obtain an inorganic aluminum precursor. The precursor was calcined at 773K for 4 h to obtain alumina powder. Samples were labeled A-NON, A-CTAB, A-SDS, A-PEG2000 and A-CTAB+SDS. Calcined at 773 K, the fibrous structure is preserved.

[0034] Table 1. Examples of structural and performance characterization of fibrous mesoporou...

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Abstract

The invention discloses fibrous mesoporous alumina and a preparation method thereof. At a medium/low temperature, inorganic aluminum salt is used as aluminum source and ammonium salt is used as precipitant to prepare fibrous mesoporous alumina through the precipitation method, wherein inorganic aluminum salt is aluminum nitrate and ammonium salt is ammonium carbonate; the traditional precipitation method is adopted to drop ammonium carbonate solution in aluminum nitrate solution and obtain precipitate; and the precipitate is aged, washed, filtered and dried to obtain fibrous precursor powder, and the obtained fibrous precursor powder is calcined to obtain fibrous mesoporous alumina. The preparation method has simple technology and safe operations and is suitable for large-scale mass production. By using inorganic aluminum salt as aluminum source and ammonium carbonate as precipitant, the production cost is low. The prepared mesoporous alumina is fibrous, the diameter is 70-500nm and the length is 2-3mu m. The fibrous mesoporous alumina has larger specific surface area and bore diameter which are separately 290-380m<2>/g and 3.8-6.5nm and can be widely used in the fields such as adsorption and catalysis, thus the fibrous mesoporous alumina has important and practical application value.

Description

technical field [0001] The present invention belongs to the field of inorganic porous materials, and specifically relates to a method for batch synthesis of fibrous mesoporous alumina. Background technique [0002] Alumina is an inorganic porous material with large specific surface area, abundant pores and good mechanical and thermal stability. As a catalyst or catalyst carrier, it is widely used in the petrochemical industry. However, the performance of alumina is not only determined by the specific surface area and pore size, but also by its unique morphology. Due to its high dielectric constant, excellent thermal and chemical stability and other special properties, alumina with 1D special morphology is receiving widespread attention[1,2]([1]Jianping Zou, Lin Pu, Ximao Bao , Duan Feng. Branchy Alumina Nanotubes. Applied Physics Letters, 80 (2002) 1079-1081. [2] Xiao-Sheng. Fang, Chang-Hui Ye, Li-De Zhang, Ting Xie. Twinning-Mediated Growth of Al 2 o 3 Nanobelts and Th...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 赵振东王鹏毕良武陈玉湘王婧张磊
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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