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A method of loading ultrafine metal nanoparticles in the inner channel of microporous material

A technology of metal nanoparticles and microporous materials, which is applied in the field of nanomaterials and nanometers, can solve the problems of large Pt nanoparticle size, large pore size of mesoporous materials, and affecting performance, so as to avoid deposition agglomeration, high dispersion, and small size Effect

Inactive Publication Date: 2019-03-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Pt is a precious metal material, its reserves in the earth's crust are low, and its cost is high. This major problem has always hindered the industrial application of Pt-based materials.
Mesoporous materials are relatively easy to carry Pt metal nanoparticles, but the pore size of mesoporous materials is large. If mesoporous materials are used to load Pt metal nanoparticles, the resulting Pt nanoparticles will be larger in size and prone to agglomeration.
Agglomeration leads to a decrease in the active surface area of ​​the nanoparticles, which affects their performance

Method used

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  • A method of loading ultrafine metal nanoparticles in the inner channel of microporous material
  • A method of loading ultrafine metal nanoparticles in the inner channel of microporous material
  • A method of loading ultrafine metal nanoparticles in the inner channel of microporous material

Examples

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Effect test

Embodiment 1

[0033] This example provides a preparation of highly monodisperse Pt metal nanoparticles@microporous composite material (Pt@MIL-101-Cr), the specific steps are as follows:

[0034] (1) Synthesis of microporous material MIL-101-Cr with hydrophilic channels:

[0035] 0.66 g of terephthalic acid (4.0 mmol) was added to 20 ml of a 0.05 mol / L aqueous solution of tetramethylammonium hydroxide, and stirred at room temperature for 10 minutes. Then add 1.6gCr(NO 3 ) 3 .9H 2 O (4.0 mmol) was added into the mixed solution, and stirring was continued for another 20 minutes. The final obtained suspension was transferred to a polytetrafluoroethylene-lined kettle and heated at 180°C for 24 hours (the time required for heating was 10 hours, and the time required for cooling was 18 hours, and the heating and cooling time did not include within 24 hours);

[0036] (2) Place the MIL-101-Cr sample in a vacuum oven at 150°C for 12 hours;

[0037] (3) 100 mg of MIL-101-Cr green powder sample ...

Embodiment 2

[0046] This example provides a preparation of highly monodisperse Pt metal nanoparticles@microporous composite material (Pt@MOF-808), the specific steps are as follows:

[0047] (1) Synthesis of MOF-808, a microporous material with hydrophilic channels:

[0048] 0.11 g trimesic acid (0.5 mmol) and 0.32 g zirconium oxychloride octahydrate ZrOCl 2 ·8H 2 O (0.5mmol) was added to a mixed solution of 20mL DMF (N,N-dimethylformamide) and 20mL formic acid, and heated and stirred at 100°C for 7 days. The resulting solid powder was washed three times with DMF, each time using 10 mL of DMF.

[0049] (2) Place the MOF-808 sample in a vacuum oven at 120°C for 12 hours;

[0050] (3) Take 100 mg of MOF-808 powder sample and dissolve it in 25 ml of anhydrous n-hexane, which is used as a hydrophobic solvent. The obtained suspension was sonicated for 15 minutes with an ultrasonic oscillator to make the suspension into a uniform solution, and then stirred at room temperature for 2 hours. A...

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Abstract

The invention relates to a method for preparing highly monodispersed ultrafine Pt metal nanoparticles in microporous materials. The method includes the following steps: 1) adding a microporous matrix material with hydrophilic channels into a hydrophobic solvent, and adding a Pt precursor into the hydrophilic solvent to prepare a hydrophilic Pt precursor solution; The hydrophilic Pt precursor solution is added to the hydrophobic solvent in which the microporous matrix material with hydrophilic pores is dispersed, stirred and dispersed, the precursor solution is introduced into the internal pores of the microporous matrix material, and then dried Obtain a microporous matrix material loaded with Pt precursor inside the pore channel; 2) The microporous matrix material loaded with the precursor obtained in step 1) is obtained by reducing the Pt precursor to obtain a microporous matrix material loaded with metal nanoparticles ;3) Filter, wash and dry to obtain the final product. Compared with other methods for preparing Pt metal nanoparticles, this preparation method has small size and high dispersion of the obtained Pt metal nanoparticles.

Description

technical field [0001] The invention belongs to the field of nanomaterials and nanotechnology, and in particular relates to a method for loading Pt metal nanoparticles only inside microporous materials. Background technique [0002] Pt-based nanomaterials have very important application value in the fields of catalysis and sensors. However, Pt is a noble metal material, its reserves in the earth's crust are low, and its cost is high. This major problem has always hindered the industrial application of Pt-based materials. Therefore, how to effectively reduce the cost of Pt-based materials without affecting the performance of the precursor is one of the very important research directions at present. [0003] The most commonly used method is to use a porous matrix material to support Pt metal nanoparticles. The advantage of this method is to replace part of the Pt material with a lower-cost porous material, which can significantly reduce the amount of Pt material, thereby Red...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J29/44C07C211/52C07C209/36
CPCC07C209/36B01J29/44B01J31/28B01J35/393B01J35/618B01J35/635C07C211/52
Inventor 田歌魏浩应杰肖宇轩范思宇阳晓宇
Owner WUHAN UNIV OF TECH
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