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Wet chemical preparation process of multi-component mixed oxide

A mixed oxide and wet chemical technology, applied in the direction of oxide/hydroxide preparation, chemical instruments and methods, oxygen/ozone/oxide/hydroxide, etc., can solve the limited types of oxide powder mixtures, loss , restrictions and other issues, to achieve the effect of less catalyst loss, uniform particle size, and uniform particle size

Inactive Publication Date: 2006-10-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the precipitation method, its advantages are: since most metal salts are soluble in water, that is, water is used as a solvent, which is safe and economical, and has a wide range of applications; the disadvantage is: when preparing materials containing multiple components, because The precipitation of various metals is closely related to the pH value of the solution. When they are co-dissolved, the concentration and precipitation speed of each component are different due to precipitation, so the uniformity of the precipitate and the original atomic level of the solution are different. Homogeneity may be partially lost and water soluble components cannot be obtained using this method
[0007] For the sol-gel method, its advantage is that the product system can accommodate both insoluble and non-precipitating components, but the disadvantage is that its hydrolysis process is limited by the type of solvent, so that the type of mixture of the prepared oxide powder limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] AlCl 3 ·6H 2 O, SnCl 4 ·5H 2 O and PdCl 2 Prepare an aqueous solution with a total ion concentration of 0.5M at a molar ratio of 5:2:0.1, quickly add it to 20 ml of ammonia water at a temperature of 65°C, and stir for 30 minutes; then add dropwise a 1M hydrochloric acid solution to the solution The pH value is 3, and it is continuously stirred at 65°C for 8 hours to form a uniform sol system; the sol is dried by spray drying to obtain a xerogel, which is thermally decomposed at 450°C to obtain Al 2 o 3 , SnO 2 and Pd mixture powder.

Embodiment 2

[0019] Dissolve indium sulfate in water to make a solution with a concentration of 0.01M, quickly add it to an appropriate amount of ammonia water at a temperature of 55°C, stir for 45 minutes, then drop in hydrochloric acid with a concentration of 1M, and stir at the same time until the pH of the solution is 4.5 , a sol was formed and stirring was continued at 55°C for another 8 hours. Butyl titanate was dissolved in ethylene glycol to prepare a solution with a concentration of 0.2M, quickly added to an appropriate amount of acetic acid, and stirred at a temperature of 80° C. for 40 minutes to form a sol. Mix the two sols at a temperature of 80°C and keep stirring for 2 hours to obtain a homogeneous sol mixing system. Freeze-dry the mixed sol to obtain a xerogel, which is thermally decomposed at 750°C to obtain TiO 2 with In 2 o 3 mixture powder.

Embodiment 3

[0021] Prepare indium sulfate and gold trichloride in a molar ratio of 1:0.05 to make an aqueous solution with a total ion concentration of 0.1M, quickly add it to an appropriate amount of ammonia water at a temperature of 50°C, stir for 45 minutes, and then drop in hydrochloric acid with a concentration of 1M. Stir at the same time until the pH of the solution is 3.5, and continue to stir at 50°C for 9 hours to form a sol. The sol is dried by spray drying to obtain a xerogel, which is thermally decomposed at 650°C to obtain In 2 o 3 and Au mixture powder.

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PUM

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Abstract

A wet chemical preparation method of multi-component mixed oxide relates to a practical multi-component mixed oxide preparation technology and / or doped oxide preparation technology, and belongs to the technical field of wet chemical powder preparation. The invention overcomes the limitations of the mixture co-precipitation technology and the sol-gel technology, so that the metal salts that can form precipitation under different pH conditions can simultaneously form a precipitation or a complex under the same conditions, and then add a suitable dispersant to make the metal salt precipitate. The product forms a sol system, which can accommodate insoluble components and non-precipitating components, thereby obtaining a mixed oxide with a more uniform particle size distribution and a controllable composition ratio or a doping oxide with a controllable doping concentration and a more uniform distribution. material powder.

Description

1. Technical field [0001] The invention relates to a practical preparation technology of multi-component mixed oxides and / or a preparation technology of doped oxides, and belongs to the technical field of wet chemical method powder preparation. 2. Background technology [0002] The traditional wet chemical oxide powder preparation technology is currently widely used in laboratories and industries to prepare powders. The wet chemical method has the characteristics of simple equipment, easy access to raw materials, high product purity, good uniformity, and accurate control of chemical composition, so it is widely used in the preparation of oxide-based powders. It mainly includes precipitation method, sol-gel method and other preparation methods. [0003] The precipitation method is to add an appropriate precipitant (such as OH - , C2O 4 2- , CO 3 2- etc.) make the cations in the raw materials form various forms of precipitates (the size and shape of the precipitated part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/14C01B13/36B01J13/00
Inventor 余萍肖定全
Owner SICHUAN UNIV