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A Synthetic Method of Mesoporous γ-al2o3 with Excellent Performance

A synthesis method and mesoporous technology, applied in the field of preparing mesoporous γ-Al2O3, can solve the problems of small pore volume, complex operation steps, mesoporous, high cost, etc., achieve high mechanical strength, short reaction time, avoid alkyl The effect of the use of aluminum

Active Publication Date: 2019-07-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the invention is to solve the problem of the high cost of the prior art, complicated operation steps and the resulting mesoporous γ-Al 2 o 3 To solve the problem of small pore volume, develop a low-cost, simple preparation method with high specific surface area and large pore volume mesoporous γ-Al 2 o 3 synthesis method

Method used

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  • A Synthetic Method of Mesoporous γ-al2o3 with Excellent Performance
  • A Synthetic Method of Mesoporous γ-al2o3 with Excellent Performance
  • A Synthetic Method of Mesoporous γ-al2o3 with Excellent Performance

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Embodiment 1

[0029] At room temperature, will contain NaAlO 2 solution with AlCl 3 ·6H 2 O solution, according to AlO 2 - and Al 3+ A molar ratio of 2.78 was mixed cocurrently to produce a white precipitate, and the resulting mixture was stirred at room temperature for 2 hours. The mixture was suction filtered and washed to obtain aluminum hydroxide precipitate, which was redispersed in Al 3+ The P123 solution with a molar ratio of 29 / P123 was mechanically stirred for 2 hours. The uniformly stirred composite was dried in an oven at 100°C for 12 hours, and the dried composite was transferred to a muffle furnace, heated to 550°C at a heating rate of 2°C / min, and then roasted at a constant temperature of 550°C for 2 hours. Depend on figure 1 N in 2 The adsorption-desorption isotherm and pore size distribution curve show that the γ-Al 2 o 3 is a mesoporous material, the resulting mesoporous γ-Al 2 o 3 The specific surface area is 400.9m 2 / g, the pore volume is 1.43cm 3 / g, the p...

Embodiment 2

[0031] At room temperature, will contain NaAlO 2 solution with AlCl 3 ·6H 2 O solution, according to AlO 2 - and Al 3+ A molar ratio of 2.78 was mixed cocurrently to produce a white precipitate, and the resulting mixture was stirred at room temperature for 2 hours. The mixture was suction filtered and washed to obtain aluminum hydroxide precipitate, which was redispersed in Al 3+ The P123 solution with a molar ratio of / P123 of 22.7 was mechanically stirred for 2 hours. The uniformly stirred composite was dried in an oven at 100°C for 12 hours, and the dried composite was transferred to a muffle furnace, heated to 550°C at a heating rate of 2°C / min, and then roasted at a constant temperature of 550°C for 2 hours. Depend on image 3 N in 2 The adsorption-desorption isotherm and pore size distribution curve show that the γ-Al 2 o 3 is a mesoporous material, the resulting mesoporous γ-Al 2 o 3 The specific surface area is 421.9m 2 / g, the pore volume is 1.56cm 3 / g,...

Embodiment 3

[0033] At room temperature, will contain NaAlO 2 solution with AlCl 3 ·6H 2 O solution, according to AlO 2 - and Al 3+ A molar ratio of 2.56 was mixed cocurrently to produce a white precipitate, and the resulting mixture was stirred at room temperature for 2 hours. The mixture was suction filtered and washed to obtain aluminum hydroxide precipitate, which was redispersed in Al 3+ The P123 solution with a molar ratio of 38.7 / P123 was mechanically stirred for 2 hours. The uniformly stirred composite was dried in an oven at 100°C for 12 hours, and the dried composite was transferred to a muffle furnace, heated to 550°C at a heating rate of 2°C / min, and then roasted at a constant temperature of 550°C for 2 hours. Depend on Figure 5 N in 2 The adsorption-desorption isotherm and pore size distribution curve show that the γ-Al 2 o 3 is a mesoporous material, the resulting mesoporous γ-Al 2 o 3 The specific surface area is 400.3m 2 / g, the pore volume is 1.38cm 3 / g, th...

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Abstract

The invention provides a method for synthesizing mesoporous gamma-Al2O3. The mesoporous gamma-Al2O3 is prepared by performing hydrolysis reaction generated by Al<3+> and AlO2<-> on inorganic cationic aluminum salt and NaAlO2 which serve as aluminum sources and a three-block polymer Pluronic P123 serving as a structure guiding agent at room temperature; the time for reaction is short, and the operation steps are simple. The specific surface area of the mesoporous gamma-Al2O3 synthesized by the method can be up to 452 m<2> / g, the pore volume can reach 1.55 cm<3> / g, and the aperture is about 10 nm; the mesoporous structure can be kept stable when being roasted at the temperature being equal to or higher than 550 DEG C; furthermore, the obtained mesoporous aluminum oxide material is high in mechanical property, and is suitable for being used as a catalyst carrier.

Description

technical field [0001] The invention relates to a mesoporous γ-Al 2 o 3 method of preparation. More specifically, it is a kind of inorganic cationic aluminum salt and NaAlO 2 As aluminum source, mesoporous γ-Al was prepared by using Pluronic P123 as structure directing agent 2 o 3 Methods. Background technique [0002] Alumina has rich crystal forms (amorphous, α phase, β phase, γ phase, δ equal), cheap and easy to obtain, and has good physical and chemical properties (thermal stability, chemical stability, mechanical stability). As an important catalyst support and adsorbent, it has been widely used in industry. Mesoporous alumina, as a new type of alumina material, not only has the physical and chemical properties of ordinary alumina materials, but also has a large specific surface area, large pore volume, and excellent pore structure. It has important roles in the fields of catalysis and adsorption. Value. [0003] In 1996, Pinnavaia et al. first reported the succ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/14
CPCC01F7/14C01P2002/72C01P2006/12C01P2006/14C01P2006/16C01P2006/17
Inventor 白鹏庄洪庆吴萍萍邢伟阎子峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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