Method for preparing superfine mesoporous magnesium aluminate spinel

A magnesia-aluminum spinel, mesoporous technology, applied in the preparation of alkaline earth metal aluminate/alumina/aluminum hydroxide, magnesium aluminate, alumina/aluminum hydroxide, etc., can solve the problem of nano-magnesium-aluminum spinel Rarely seen and so on

Inactive Publication Date: 2009-10-28
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the synthesis of high specific surface, porous, nano-magnesium aluminum spinel by hydrothermal method.

Method used

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  • Method for preparing superfine mesoporous magnesium aluminate spinel
  • Method for preparing superfine mesoporous magnesium aluminate spinel
  • Method for preparing superfine mesoporous magnesium aluminate spinel

Examples

Experimental program
Comparison scheme
Effect test

example 1-4

[0039] Examples 1-4 illustrate the preparation of magnesium aluminum spinel with different aluminum sources, magnesium sources and preparation conditions by adopting the method provided by the present invention. The formula used and the properties of the synthesized magnesium aluminum spinel are shown in Table 1. The specific preparation method of magnesium aluminum spinel is as follows: (1) Weigh a certain amount of aluminum source and magnesium source compound, dissolve in 50 milliliters of deionized water to make mixed solution I; (2) under continuous and rapid stirring conditions 216 milliliters of ammoniacal liquor of 25% by weight is added dropwise in mixed solution I; And add 0.36 gram of hexadecyltrimethylammonium bromide, make mixed solution II; Each component mol ratio is about in the mixture, Al: Mg:OH - : Surfactant: H 2 O=2: 1: 3: 0.1: 10; (3) after the dropwise addition, the mixed solution II continued to stir for a certain period of time at room temperature, a...

example 5-8

[0044] Examples 5-8 illustrate the preparation of magnesium aluminum spinel with different surfactants, lyes and preparation conditions by using the method provided by the present invention. The formula used and the properties of the synthesized magnesium aluminum spinel are shown in Table 2. The specific preparation method of magnesium aluminum spinel is as follows: (1) Weigh a certain amount of aluminum source and magnesium source compound, dissolve in 50 milliliters of deionized water to make mixed solution I; (2) under continuous and rapid stirring conditions , a certain amount of lye is added dropwise to the mixed solution I; and an appropriate amount of surfactant is added to make the mixed solution II; the molar ratio of each component in the mixture is about, Al: Mg: OH - : Surfactant: H 2 O=2: 1: 3: 0.1: 10; (3) after the dropwise addition, the mixed solution II continued to stir for 1 hour at room temperature, and left to age for 8 hours; (4) the aged mixture was ch...

example 9-12

[0048] Examples 9-12 illustrate the preparation of magnesium-aluminum spinel with different raw material ratios and preparation conditions by using the method provided by the present invention. The formula used and the properties of the synthesized magnesium aluminum spinel are shown in Table 3. The specific preparation method of magnesium aluminum spinel is as follows: (1) Weigh a certain amount of aluminum source and magnesium source compound, dissolve in 50 milliliters of deionized water to make mixed solution I; (2) under continuous and rapid stirring conditions 216 milliliters of ammoniacal liquor of 25% by weight is added dropwise in mixed solution I; And add 0.36 gram of hexadecyltrimethylammonium bromide, make mixed solution II; Each component mol ratio is about in the mixture, Al: Mg:OH - : Surfactant: H 2 O=2: 1: 3: 0.1: 10; (3) After the dropwise addition, the mixed solution II continued to be stirred at room temperature for 0.5 hours, and left to age for 4 hours;...

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Abstract

The invention discloses a method for preparing a superfine mesoporous magnesium aluminate spinel, which comprises the following steps: (1) adding an alkaline solution into a mixed solution of a soluble aluminum salt and a magnesium salt, and adding a surfactant into the mixture; (2) performing hydrothermal crystallization on the mixture after ageing at a temperature of between 120 and 180 DEG C for 4 to 72 hours; and (3) separating the mixture to obtain a solid product, and washing, filtering and drying the solid product to obtain magnesium aluminate spinel powder without baking or after baking at a temperature of between 500 and 700 DEG C for 4 to 6 hours. The particle size of the magnesium aluminate spinel prepared by the method is less than 100 nanometers, the specific surface area is between 200 and 400 m / gram, the pore volume is between 0.20 and 0.55 cm / gram, and the most probable pore diameter is between 3 and 6 nanometers.

Description

technical field [0001] The invention belongs to the field of synthesis and application of inorganic materials. Specifically, the invention provides a preparation method of ultrafine magnesium-aluminum spinel with high specific surface area and mesoporous structure. technical background [0002] Spinel-type magnesium aluminate oxide (magnesium-aluminum spinel) has special physical and chemical properties, such as (1) defects such as ionic vacancies and large surface energy edges and corners; (2) surface acid-base (3) good hydrothermal stability; (4) good chemical stability; (5) high mechanical strength; therefore, magnesium aluminum spinel is an important class of catalysts and catalyst supports, and its preparation and catalytic The application has attracted widespread attention. [0003] Magnesia-aluminum spinel is prepared by the traditional method - "pottery firing method", which requires a high firing temperature (1435°C), and the produced magnesium-alumina spinel parti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/162
CPCC01F7/162C01P2002/32C01P2002/72C01P2004/04C01P2004/64C01P2006/12C01P2006/14C01P2006/16
Inventor 张昕
Owner NORTHWEST UNIV(CN)
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