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Ordered mesoporous alumina materials loaded with precious metals and their synthesis methods and applications

A mesoporous alumina and synthesis method technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, separation methods, etc., can solve the problems of difficult uniform dispersion of nanoparticles, low filling rate, and capillary action Small problems, to achieve high catalytic activity and thermal stability, high loading rate, high dispersion effect

Inactive Publication Date: 2017-06-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the key step of this synthesis method similar to the "casting" process lies in the loading efficiency of metal oxide precursors in the mesoporous channels, and the actual situation is that during the impregnation process, the metal salt solution is more willing to adsorb on the outer surface of the channels. , at the same time, capillary action is the only driving force for the solution to move in the channel. If the force between the mesoporous pore wall and the solution is weak, the capillary action will also become very small, resulting in a low filling rate of the solution in the channel. At the same time, the nanoparticles Difficult to disperse evenly
Repeated impregnation is a common method for the "nano-casting" method, but the problem brought about by this is that the synthesis steps are cumbersome and time-consuming, and the yield of the ordered structure can not be compared with the soft template method, which cannot meet the needs of large-scale synthesis and Further practical needs
Another commonly used method is the grafting method. Although the grafting method can ensure that the nanoparticles enter the pores, it is necessary to find a suitable grafting molecule, and the loading needs to be carried out in multiple steps.

Method used

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  • Ordered mesoporous alumina materials loaded with precious metals and their synthesis methods and applications
  • Ordered mesoporous alumina materials loaded with precious metals and their synthesis methods and applications
  • Ordered mesoporous alumina materials loaded with precious metals and their synthesis methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 1.0 g of nonionic surfactant Pluronic P123 and 20 mL of ethanol to a 50 mL beaker, and stir at room temperature until Pluronic P123 dissolves. Add 8.4g of citric acid, stir to dissolve, then add 0.006g of platinum acetylacetonate and 3.75g of aluminum nitrate, and stir at room temperature for 10 hours or longer until completely dissolved. After the dissolution is complete, transfer the beaker to an air blast drying oven, place it open, and set the temperature at 40°C, and volatilize the solvent under this condition. After 48 hours, take out the colloid after the solvent has volatilized, transfer the colloid to a porcelain crucible, raise the temperature to 400°C, and roast it in an air atmosphere at this temperature for 4 hours to remove the template agent, and grind it finely with an agate mortar to obtain a powder product, namely It is an ordered mesoporous alumina material loaded with platinum, and the mass percentage of platinum loaded in the material is 0.6% (c...

Embodiment 2

[0054] The operation method is the same as in Example 1, except that the platinum acetylacetonate added is 0.013 g, and the mass percentage of platinum supported is 1.3%. The small angle XRD of the material is shown in figure 1 , wide-angle XRD see figure 2 ; Nitrogen adsorption and desorption curve see image 3 , the pore size distribution see Figure 4 , the pore size of the material varies between 4-6nm; the specific surface area and pore volume are shown in Table 1, and the transmission electron microscope (TEM) photos are shown in Figure 6 .

Embodiment 3

[0056] The operation method is the same as in Example 1, except that the platinum acetylacetonate added is 0.021 g, and the mass percentage of platinum supported is 2.1%. The small angle XRD of the material is shown in figure 1 , wide-angle XRD see figure 2 , the nitrogen adsorption-desorption curve is shown in image 3 , the pore size distribution see Figure 4 , the pore size of the material varies between 4-6nm; the specific surface area and pore volume are shown in Table 1, and the transmission electron microscope (TEM) photos are shown in Figure 7 .

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Abstract

The invention provides a precious-metal-supported ordered mesoporous alumina material, and a synthetic method and application thereof. The method comprises the following steps: uniformly mixing acid, alcohol and a non-ionic surfactant, then adding hydrophobic precious metal salt and aluminium salt, and carrying out uniform mixing so as to obtain a mixed solution; and maintaining the obtained mixed solution for a period of time at 30 to 60 DEG C so as to volatile a solvent; and carrying out calcination at 300 to 600 DEG C so as to obtain the precious-metal-supported ordered mesoporous alumina material. The precious-metal-supported ordered mesoporous alumina material can be applied in preparation of a catalyst for oxidation reaction of carbon monoxide. According to the invention, the precious-metal-supported ordered mesoporous alumina material is synthesized by a one-step method; the precious metal nanoparticle of the material have high dispersity, high supporting rate, small size and highly-ordered mesopore channel structure in a mesoporous material; and the precious-metal-supported ordered mesoporous alumina material, used as the catalyst for the oxidation reaction of carbon monoxide, has high catalytic activity and heat stability.

Description

technical field [0001] The invention relates to an ordered mesoporous alumina material loaded with precious metals and a synthesis method and application thereof, belonging to the technical field of porous materials loaded with noble metals. Background technique [0002] Among mesoporous materials, mesoporous silica is a system that has been studied more deeply. Compared with silica, alumina has some properties superior to silica, such as higher hydrolytic stability, stronger acidity, easier loading of different metal species, etc., so it has been more widely used in the fields of catalysis and adsorption. for a wide range of applications. Because alumina has a large specific surface area, special pore structure, certain acidity, and high thermal stability, the specific surface area can still be maintained at 100m when the temperature is higher than 800°C. 2 It is the most widely used in the field of catalysis, and has become the most widely used catalyst or catalyst carri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/50B01J23/44B01D53/90B01D53/62
CPCY02A50/20
Inventor 李振兴
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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