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Alumina-coated palladium composite nanomaterial and preparation method thereof

A technology of composite nanomaterials and alumina, which is applied in the field of composite nanomaterials coated with alumina and palladium and its preparation, can solve the problems of easy "poisoning" of nano-Pd powder, cumbersome and complicated preparation methods, and inability to obtain products, and achieve production costs. low cost, simple preparation method and reasonable structure

Inactive Publication Date: 2017-07-11
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this catalyst has high catalytic activity, it still has shortcomings. First, the exposed nano-Pd powder is still very easy to "poison", which makes its service life shorter; second, the preparation method is cumbersome and time-consuming. Energy consumption, and products with high hydrogenation and polymerization service life cannot be obtained

Method used

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  • Alumina-coated palladium composite nanomaterial and preparation method thereof
  • Alumina-coated palladium composite nanomaterial and preparation method thereof
  • Alumina-coated palladium composite nanomaterial and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The concrete steps of preparation are:

[0034] Step 1, first place the palladium target in a stirred 0.01mol / L aluminum nitrate solution; wherein, the aluminum nitrate solution is an aqueous aluminum nitrate solution. Then use a laser with a wavelength of 532nm (or 1064nm), a repetition rate of 1Hz, a pulse width of 15ns, and a power of 40mJ / pulse to irradiate the palladium target for 60min; wherein, the laser spot diameter is 0.5mm, and the emission wavelength is 532nm (or 1064nm ) laser is a Nd:YAG solid-state laser to obtain a mixed colloidal solution.

[0035] Step 2, the mixed colloidal solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotating speed is 1000r / min, and the time is 20min, and the washing process is to use deionized water or ethanol or Acetone washes the separated solid matter twice, the separation of solid matter during cleaning is centrifugation, an...

Embodiment 2

[0037] The concrete steps of preparation are:

[0038] Step 1, first place the palladium target in a 0.05mol / L aluminum nitrate solution under stirring; wherein, the aluminum nitrate solution is an aqueous aluminum nitrate solution. Then use a laser with a wavelength of 532nm (or 1064nm), a repetition rate of 5Hz, a pulse width of 12.5ns, and a power of 60mJ / pulse to irradiate the palladium target for 50min; wherein, the laser spot diameter is 1mm, and the emission wavelength is 532nm (or 1064nm ) laser is a Nd:YAG solid-state laser to obtain a mixed colloidal solution.

[0039] Step 2, the mixed colloidal solution is subjected to solid-liquid separation, washing and drying in sequence; wherein, the solid-liquid separation process is centrifugation, the rotating speed is 3000r / min, and the time is 15min, and the washing process is to use deionized water or ethanol or Acetone washes the separated solid matter twice, the separation of the solid matter during cleaning is centrif...

Embodiment 3

[0041] The concrete steps of preparation are:

[0042]Step 1, first place the palladium target in a 0.2 mol / L aluminum nitrate solution under stirring; wherein, the aluminum nitrate solution is an aqueous aluminum nitrate solution. Then use a laser with a wavelength of 532nm (or 1064nm), a repetition rate of 10Hz, a pulse width of 10ns, and a power of 80mJ / pulse to irradiate the palladium target for 40min; wherein, the laser spot diameter is 1.5mm, and the emission wavelength is 532nm (or 1064nm ) laser is a Nd:YAG solid-state laser to obtain a mixed colloidal solution.

[0043] Step 2, the solid-liquid separation, washing and drying of the mixed colloidal solution are carried out successively; wherein, the solid-liquid separation process is centrifugation, the rotating speed is 6000r / min, and the time is 10min, and the washing process is to use deionized water or ethanol or Acetone washes the separated solid matter three times. The separation of the solid matter during clean...

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Abstract

The invention discloses a composite nano material of aluminum oxide coated palladium and a preparation method thereof. The material is a nanoparticle two-dimensional chain, wherein the particle diameter of the nanoparticle constituting the nanoparticle two-dimensional chain is 6-80nm, which is composed of palladium nanoparticles coated with alumina, and the particle diameter of the palladium nanoparticle is 5-80nm. 50nm, the thickness of the aluminum oxide layer is 1-30nm; the method first puts the palladium target in the aluminum nitrate solution under stirring, and then uses a wavelength of 532nm or 1064nm, a repetition frequency of 1-20Hz, and a pulse width of 5-15ns. A laser with a power of 40-120mJ / pulse irradiates the palladium target for at least 20 minutes to obtain a mixed colloidal solution. Afterwards, the mixed colloidal solution is sequentially subjected to solid-liquid separation, washing and drying to obtain the target product. It has high hydrogenation and polymerization service life and structural stability, and is extremely easy to be widely commercialized in the fields of hydrogenation, polymerization, gas sensors, and surface-enhanced Raman scattering.

Description

technical field [0001] The invention relates to a composite nano material and a preparation method thereof, in particular to a composite nano material with aluminum oxide coated palladium and a preparation method thereof. Background technique [0002] As a metal, palladium (Pd) is an indispensable key material in high-tech fields such as aerospace and aviation, as well as in automobile manufacturing. In the field of nanomaterials, palladium is usually used as a catalyst and has important application value in the fields of gas sensing, photocatalysis, and electrochemistry. However, the practical application of palladium in various hydrogenation and polymerization reactions also has the problems of short service life and high regeneration frequency. To solve this problem, people have made unremitting efforts, such as in "nano-Pd / Al 2 o 3 Catalyst characterization and its selective hydrogenation reaction performance", "Acta Petroleum Sinica (Petroleum Processing)" in June 20...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/02
CPCB22F9/24B22F1/17
Inventor 张洪文王莹莹蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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