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A kind of method for preparing layered double metal hydroxide from metal powder

A layered bimetallic, hydroxide technology, applied in the directions of alumina/aluminum hydroxide, zinc oxide/zinc hydroxide, nickel oxide/nickel hydroxide, etc., can solve the complex operation process, consumption cost and many restrictions. and other problems, to achieve the effect of simple process flow, low cost and energy consumption, and low equipment investment

Inactive Publication Date: 2011-12-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the Chinese invention patent (CN 1507944A) uses MgCO 3 or Mg(OH) 2 As a magnesium source, it is roasted at high temperature to obtain active MgO, and then mixed with aqueous sodium aluminate solution, adding NaOH and Na 2 CO 3 , to obtain MgAl-LDH by stirring, the reaction operation process is too complicated, and there are many restrictions at the same time, the reaction also consumes NaOH and the cost is high
The LDHs prepared by the above traditional methods have the disadvantages of low crystallinity, insufficient order of hydroxylated laminates and impurity of interlayer anions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix 0.8 mol magnesium powder (Mg) with aluminum hydroxide (Al(OH) 3 ) and sodium bicarbonate (NaHCO 3 ) according to the molar ratio of 4:1:5 is placed in a hydrothermal kettle with 1000ml of aqueous solution, hydrothermally reacted at 150°C for 48 hours, and finally the product is separated and washed with water, and dried at 70°C for 12 hours to obtain the interlayer anion Magnesium aluminum LDHs for carbonate.

Embodiment 2

[0017] Mix 1.0 mol magnesium powder (Mg) with aluminum hydroxide (Al(OH) 3 ) and sodium carbonate (Na 2 CO 3 ) according to the molar ratio of 2:1:6 is placed in a hydrothermal kettle with 1000ml of aqueous solution, hydrothermally reacted at 180°C for 20 hours, and finally the product is separated and washed with water, and dried at 60°C for 24 hours to obtain the interlayer anion Magnesium aluminum LDHs for carbonate.

Embodiment 3

[0019] Mix 0.8 mol magnesium powder (Mg) with aluminum hydroxide (Al(OH) 3 ) and sodium chloride (NaCl) were placed in a hydrothermal kettle with 1000ml of aqueous solution in a molar ratio of 3:1:10, and reacted hydrothermally at 140°C for 54 hours. Finally, the product was separated and washed with water, and dried at 80°C for 10 Hours, the magnesium-aluminum LDHs whose interlayer anions are chloride ions are obtained.

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PUM

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Abstract

The invention discloses a method for preparing layered double metal hydroxides from metal powder, which belongs to the technical field of double metal hydroxides. First, divalent metal powder or its hydroxide, trivalent metal powder or its hydroxide, soluble salt and deionized water are used in a certain proportion to form a hydrothermal solution. Then the solution is placed in a hydrothermal kettle, hydrothermally reacted in a standing state, the product is separated and washed with water, and then dried to obtain a layered double metal hydroxide. The invention has the advantages that the layered double metal hydroxide with a regular layered structure can be directly prepared in one step, and compared with the traditional method, the process flow is simple, the equipment investment is small, and the cost and energy consumption are low.

Description

technical field [0001] The invention belongs to the technical field of double metal hydroxides. In particular, a method for preparing layered double metal hydroxides from metal powders is provided. Background technique [0002] Layered double hydroxides (Layered Double Hydroxides, abbreviated as LDHs) are an important class of inorganic functional materials, which have a layered structure similar to brucite. In the layer, some divalent cations are replaced by trivalent cations, so that The laminate is positively charged, and the interlayer is filled with anions and water molecules with balanced charges. Its general chemical formula is [M 2+ 1-x m 3+ x (OH) 2 ] x+ (A n- ) x / n ·yH 2 O). Due to its unique anion exchange properties, designability of laminate composition, and recoverability of structure, it has been widely used in the fields of catalysis, adsorption, environment, medicine, nanomaterials, and functional polymer materials. LDHs can be used as catalysts a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01G49/02C01G9/02C01G53/04
Inventor 李峰秦华刘玉成邹鲁
Owner BEIJING UNIV OF CHEM TECH