Gamma-alumina particles and method for manufacturing same

A technology of alumina particles and pore size, which is applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of high cost, complicated production process, cumbersome production process, etc., and achieve the effect of low cost, simple process and accelerated catalytic reaction rate

Inactive Publication Date: 2013-07-17
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two types of methods, on the one hand, the production process is cumbersome, for example, in the hydrothermal method, the sediment needs to be filtered, washed and dried; When , more catalyst

Method used

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  • Gamma-alumina particles and method for manufacturing same
  • Gamma-alumina particles and method for manufacturing same
  • Gamma-alumina particles and method for manufacturing same

Examples

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specific Embodiment approach

[0032] Provide a kind of preparation method of gamma-alumina particle in this specific embodiment, comprise the following steps:

[0033] 1) Dissolving the soluble aluminum salt in an aqueous solution acidified by acid with a pH value less than or equal to 3, the amount of the soluble aluminum salt added is such that the molar concentration of aluminum ions in the prepared aluminum-containing aqueous solution is 0.01-5 mol / L.

[0034] Among them, the soluble aluminum salt is aluminum chloride hexahydrate (AlCl 3 ·6H 2 O), anhydrous aluminum chloride (AlCl 3 ), aluminum nitrate nonahydrate (Al(NO 3 ) 3 9H 2 O), sodium metaaluminate (NaAlO 2 ), ammonium aluminum sulfate (NH 4 Al(SO 4 ) 2 ) and aluminum sulfate octadecahydrate (Al 2 (SO 4 ) 3 18H 2 O) one or more mixtures. The acid is one or a mixture of hydrochloric acid, nitric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, citric acid and malic acid.

[0035]Preferably, it also includes adding a ...

Embodiment 1

[0052] Take 26.16g of AlCl 3(soluble aluminum salt), 0.5g CTAB (pore forming agent) dissolved in 240ml of aqueous solution acidified by hydrochloric acid with a pH value of 3 and mixed evenly, and then an appropriate amount of ammonia water (alkaline precipitant) was added dropwise to the mixed solution to make the transition metal ions Precipitate to form a hydrosol, the amount of ammonia water added dropwise makes the final pH of the solution after the reaction = 8.3, the suspension of the mixed precipitate obtained after the reaction is stirred at room temperature for 2 hours, and the suspension of the mixed precipitate is aged at 90 ° C. After 20 hours, stir the aged water sol evenly and use the spray drying method to atomize and dry. When spray drying, the inlet air temperature is 200°C, the outlet air temperature is 100°C, and the thermal efficiency of spray drying is 50%. After drying, the obtained The alumina precursor powder was heated from room temperature to 350°C a...

Embodiment 2

[0054] The difference between this example and Example 1 is that in this example, 0.5 g of the pore-forming agent CTAB in Example 1 is replaced by 1 g of the pore-forming agent CTAB. All the other step processes are the same as in Example 1, and the final product γ-Al obtained 2 o 3 Granules, named A-2.

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Abstract

The invention discloses gamma-alumina particles and a method for manufacturing the same. The method includes co-precipitation procedures implemented in a step 1) and a step 2), a hydrothermal ageing procedure implemented in a step 3), a spray-drying procedure implemented in a step 4) and a heating procedure implemented in a step 5) so that the gamma-alumina particles are manufactured. The gamma-alumina particles and the method have the advantages that the procedures for manufacturing the gamma-alumina particles are simple, and follow-up treatment procedures required by a common hydrothermal method are omitted; cheap soluble aluminum salt is used as a raw material during manufacture, and accordingly the cost is low; as verified and tested by experiments, the manufactured gamma-alumina particles are high in specific surface area which ranges from 180m<2>/g to 260m<2>/g; the manufactured gamma-alumina particles have hollow foam-shaped morphological structures when observed under a scanning electron microscope and are of micropore-mesopore-macropore composite aperture structures, so that active components in catalysts can be effectively dispersed by the hollow foam-shaped morphological structures of the gamma-alumina particles when gamma-alumina is used as a carrier of the catalysts; and material transmission in a catalytic procedure is facilitated by the hollow foam-shaped morphological structures and the composite aperture structures, and accordingly the catalytic reaction rate is increased.

Description

【Technical field】 [0001] The invention relates to alumina particle material and its preparation method, in particular to a gamma-alumina particle and its preparation method. 【Background technique】 [0002] There are currently 8 crystal forms of alumina found, namely γ-, β-, θ-, η-, k-, π-, σ- and α-, a total of 8 crystal forms, of which α-Al 2 o 3 It is a high-temperature stable final crystal form. The other seven crystal forms of alumina belong to the transition phase, and the alumina of this type of transition phase will eventually undergo a phase transformation reaction and transform into α-Al 2 o 3 . γ-Al 2 o 3 Among all the transition phases, the structure is relatively stable, the preparation process is relatively easy to control, the raw materials are easy to obtain, and it has the advantages of good adsorption performance and large specific surface. agent carrier material. γ-Al 2 o 3 It is a defect spinel structure and belongs to the cubic crystal system. ...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 翁端司知蠢李明阳王敏
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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