Preparation method for copper and aluminium hydrotalcite

A hydrotalcite, copper-aluminum technology, applied in chemical instruments and methods, copper compounds, inorganic chemistry, etc., can solve the problems of high cost, large metal salt, low atom utilization rate, etc., and achieve low industrialization costs, good crystallinity, Effect of High Atom Utilization

Active Publication Date: 2012-09-12
徐州宏阳新材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In summary, in the existing methods for preparing copper-aluminum hydrotalcite, most of the copper sources used are metal salts, and more are metal salts containing multiple crystal waters. When a large amount of hydrotalcite needs to be synthesized, the required The amount of metal salt is relatively large, which makes the cost high and the utilization rate of atoms is low, which is not suitable for industrial production
Moreover, the hydrothermal method also has the problem that the quality of the copper-aluminum hydrotalcite produced is not high

Method used

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  • Preparation method for copper and aluminium hydrotalcite
  • Preparation method for copper and aluminium hydrotalcite
  • Preparation method for copper and aluminium hydrotalcite

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Weigh 6g of AlCl 3 and 4.9g of Cu(OH) 2 Dissolve in 50ml of deionized water in a three-necked flask to form a mixed solution. Constant electric stirring at 30 °C. The solution turned blue in about 30 minutes. Measure its pH=3, continue to stir and react for 3h, then crystallize at 30°C for 24h, then filter it with suction, wash it with deionized water for 3 times, put it in a drying oven at 40°C for 24h, and grind it to obtain Cu / Al hydrotalcite powder.

Embodiment 2

[0028] Weigh 6g of AlCl 3 and 4.9g of Cu(OH) 2 Dissolve in 50ml of deionized water in a three-necked flask to form a mixed solution. Under constant temperature electric stirring at 35°C, the solution turns blue in about 30 minutes. Weigh 5g of NaOH, dissolve it in 50ml of deionized water to make a 0.1g / ml solution, add part of it to the above blue solution, adjust pH=6, continue to stir for 3h and then crystallize at 35°C for 18h , and then suction filtered, and washed with deionized water for 3 times, then placed in a 40°C drying oven for 24 hours, and then ground to obtain Cu / Al hydrotalcite powder.

Embodiment 3

[0030] Weigh 6g of AlCl 3 and 4.9g of Cu(OH) 2 Dissolve in 50ml of deionized water in a three-necked flask to form a mixed solution. Under constant temperature electric stirring at 35°C, the solution turns blue in about 30 minutes. Weigh 5g of NaOH, dissolve it in 50ml of deionized water to make a 0.1g / ml solution, add part of it to the above blue solution, adjust pH=6, continue stirring for 3h and then crystallize at 40°C for 20h , and then suction filtered, and washed with deionized water for 3 times, then placed in a 60°C drying oven for 24 hours, and then ground to obtain Cu / Al hydrotalcite powder. Its XRD pattern is as follows figure 2 shown.

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Abstract

The invention discloses a preparation method for copper and aluminium hydrotalcite. The preparation method comprises the following steps of: (1) weighing a copper source and aluminium chloride according to a 2:1 molar ratio of Cu:Al, wherein the copper source is copper oxide or copper hydroxide, dissolving the copper oxide or copper hydroxide and the aluminium chloride in deionized water to be prepared into a mixed liquor in a reaction vessel, heating and stirring the mixed liquor at the constant temperature of 30-40 DEG C till all the copper oxide or copper hydroxide is dissolved, i.e. the color of the solution becomes blue; (2) adjusting the pH value of the solution obtained in the step (1), leading the pH value of the solution not to be higher than 8, and continuously reacting for 2-4h at the temperature of 30-40 DEG C; (3) crystallizing the slurry reacted in the step (2) at the constant temperature of 30-40 DEG C; and (4) filtering, washing, drying and grinding reaction liquid crystallized in the step (3) to obtain the copper and aluminium hydrotalcite. The preparation method has the advantages that used raw materials are low in cost and easily obtained, the conversion rate of atoms is high, and the industrialization cost can be reduced.

Description

(1) Technical field [0001] The invention relates to a preparation method of copper-aluminum hydrotalcite. (2) Technical background [0002] Hydrotalcite is similar to brucite Mg(OH) 2 It is an inorganic material with an anionic layered structure. It consists of metal ions and octahedral shared edges composed of six hydroxyl groups to form laminates. Anions or water molecules can be doped between the laminates. The general structural formula is M 2+ 1-x m 3+ x (OH) 2 An x- x / n .mH 2 O, where M is a metal element, which can be a trivalent or divalent metal ion; A is an interlayer anion, and x is M 3+ / (M 2+ +M 3+ ), generally between 0.2 and 0.33. We can control the charge density of the laminates by adjusting the ratio of divalent and trivalent metal cations, thereby controlling the number of interlayer anions and obtaining the hydrotalcite we need. In addition, the exchangeability of interlayer anions also provides us with a method for preparing supramolecular la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G3/00
Inventor 王力耕杨超鸿郑逸凡倪哲明袁庭胡军
Owner 徐州宏阳新材料科技股份有限公司
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