Method for synthesizing mesoporous gamma-Al2O3 by anion/cation dual-hydrolysis

An anion-cation and double hydrolysis technology, which is applied in the preparation of alkali metal aluminate/alumina/aluminum hydroxide, can solve the problems of long production cycle, harsh reaction conditions, and high price, and achieve good hydrothermal stability, Rapid hydrolysis reaction and high mechanical strength

Inactive Publication Date: 2014-12-24
PETROCHINA CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, these methods generally require the use of expensive and toxic alkylaluminum as an aluminum source, resulting in high production costs and great harm to the operator.
Or it needs a very long and complicated process of hydrolysis and pH adjustment, which makes the production cycle long and the reaction conditions harsh
This makes the preparation of mesoporous alumina difficult to achieve industrialization

Method used

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  • Method for synthesizing mesoporous gamma-Al2O3 by anion/cation dual-hydrolysis
  • Method for synthesizing mesoporous gamma-Al2O3 by anion/cation dual-hydrolysis
  • Method for synthesizing mesoporous gamma-Al2O3 by anion/cation dual-hydrolysis

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Embodiment 1

[0042] Under vigorous stirring, a certain amount of NaAlO 2 Solution (4.71wt%Al 2 o 3 ,2.87wt%Na 2 O) was added dropwise to Al(NO 3 ) 3 and P123 mixed aqueous solution (10.3wt%Al(NO 3 ) 3 ,7.7wt%P123), after stirring at room temperature for 4 hours, the molar composition of Al(NO 3 ) 3 9H 2 O:3NaAlO 2 :0.05P123:278H 2 O mixture, the reaction mixture was allowed to stand at room temperature for 24 hours, then transferred to a stainless steel reactor, crystallized at 80°C for 24 hours, taken out, filtered with suction, washed to remove floating matter on the surface. Dry at 80°C to obtain an organic-inorganic composite, which is then fired at 150°C for 6 hours, and then fired at 500°C for 4 hours to obtain mesoporous alumina. Representative N 2 Adsorption-desorption isotherm, XRD, TG-DTA curve as Figure 1~4 shown.

Embodiment 2

[0044] Under vigorous stirring, a certain amount of Al(NO 3 ) 3 solution (15.79 wt%) was added dropwise to NaAlO 2 and a mixed aqueous solution of P123 (4.44wt% Al 2 o 3 ,8.02wt%P123,2.63wt%Na 2 O), after stirring at room temperature for 4 hours, the molar composition of Al(NO 3 ) 3 9H 2 O:3NaAlO 2 :0.05P123:278H 2 O mixture. Other conditions are the same as example 1.

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Abstract

The invention relates to a method for synthesizing mesoporous gamma-Al2O3 by anion / cation dual-hydrolysis, which is characterized in that cheap and accessible inorganic salts Al(NO3)3 and NaAlO2 are used as aluminum sources to synthesize the mesoporous gamma-Al2O3 material by using Pluronic P123 as a structural guide agent and using dual-hydrolysis as the guiding ideology. The method comprises the following steps: dissolving P123 in distilled water; after the solution becomes clear and transparent, adding Al(NO3)3.9H2O solid powder, and dissolving by stirring; meanwhile, weighing a certain amount of NaAlO2, and dissolving in distilled water; while intensely stirring, dropwisely adding the NaAlO2 solution into the Al(NO3)3 solution; after finishing the addition, continuing the intense stirring for 4 hours; transferring the reaction gel into a stainless steel reaction kettle, and crystallizing at 60-120 DEG C for 1-4 days; and taking out, carrying out vacuum filtration, washing, drying to obtain a surfactant-alumina organic-inorganic composite, and roasting the composite in a muffle furnace for 2 hours to obtain the mesoporous alumina.

Description

technical field [0001] The invention relates to a method for simply synthesizing mesoporous alumina by utilizing anion-cation double hydrolysis reaction. The method is guided by the double hydrolysis method, and the cheap and easy-to-obtain inorganic salt, Al(NO 3 ) 3 and NaAlO 2 As the aluminum source, Pluronic P123 was used as the structure directing agent to synthesize mesoporous γ-Al 2 o 3 Material. Background technique [0002] Alumina is an important industrial chemical. Because of its good thermal stability, strong chemical stability, high mechanical stability and low price, it is often used as a catalyst and catalyst carrier in industry. Amorphous transition state alumina is generally formed by the dehydration of aluminum hydrate, and is often used in petroleum cracking, hydrocracking, and hydrodesulfurization processes as adsorbents, catalysts, and catalyst supports in chemical processes. Activated alumina is an important catalyst in chemical processes such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/14
Inventor 阎子峰白鹏乔柯刘欣梅谭争国张忠东高雄厚张志华
Owner PETROCHINA CO LTD
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