Method for preparing organic hydrogenation catalyst based on noble metal nanoparticles

A nanoparticle and hydrogenation reaction technology, applied in the field of nanomaterials, can solve the problems of complex catalyst preparation methods and unoptimized catalytic activity, and achieve excellent catalytic activity

Active Publication Date: 2016-11-09
XI AN JIAOTONG UNIV
5 Cites 11 Cited by

AI-Extracted Technical Summary

Problems solved by technology

The preparation method of the catalyst is relatively compli...
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Abstract

The invention discloses a method for preparing an organic hydrogenation catalyst based on noble metal nanoparticles. The method is as below: first conducting amino modification on a substrate material, and then preparing a noble metal nanoparticles layer on the amino modified substrate material, so as to obtain the organic hydrogenation catalyst based on noble metal nanoparticles. The method can load ultra small noble metal nanoparticles with a variety of particle sizes on a variety of substrate surface, and the particle size can be precisely controlled; and the catalyst shows excellent catalytic activity in organic hydrogenation. The method can prepare novel noble metal nano catalyst based on ultra small size, so as to achieve hydrogenation activity much higher than that of conventional catalyst materials.

Application Domain

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  • Method for preparing organic hydrogenation catalyst based on noble metal nanoparticles
  • Method for preparing organic hydrogenation catalyst based on noble metal nanoparticles
  • Method for preparing organic hydrogenation catalyst based on noble metal nanoparticles

Examples

  • Experimental program(11)
  • Effect test(1)

Example Embodiment

[0038] Example 1:
[0039] 1) Preparation of ~100nm silica balls: Add 15mL of ethyl orthosilicate (TEOS) to a mixed solution consisting of 294mL of ethanol, 24mL of deionized water and 7.5mL of aqueous ammonia (28wt%), and stir at room temperature for 12 hours, Centrifuge the silicon ball and redisperse it into 50 mL isopropanol (HPLC grade), then add 0.1 mL 3-amino-4-hydroxybenzene sulfonic acid (APS), reflux at 70°C for 10 hours, then centrifuge and use the solid part The mixture of anhydrous ethanol and water is cleaned and re-dispersed in 150ml of anhydrous ethanol to obtain a base dispersion after amino modification.
[0040] 2) Preparation of ultra-small platinum nanoparticle film layer on the surface of the silicon ball. Take 3mL of the amino-modified base dispersion prepared in step 1) and add it to a mixture of 20mL of absolute ethanol, 125mL of deionized water and 0.2mL of aqueous ammonia (28wt%), and add 0.3g of dodecyl Sodium benzene sulfonate (SDBS), stir evenly to obtain a base mixture. Mix resorcinol into a 25g/L solution, add K 2 PtCl 4 Prepare a 0.1mol/L solution. Take 10mL of the prepared resorcinol solution and 2mL K 2 PtCl 4 The solution was mixed with 0.42mL formaldehyde solution (37wt%) and added to the above-mentioned base mixture. After stirring for 24 hours in a water bath at 28°C, it was refluxed at 70°C for 10 hours, and then centrifuged. The solid part was composed of absolute ethanol and After the water mixture is washed several times, it is dried in an oven at 60°C, that is, a precious metal nanoparticle layer is prepared on the surface of the substrate, and an organic hydrogenation reaction catalyst based on precious metal nanoparticles is obtained.
[0041] figure 1 This is a transmission electron microscope picture of the ultra-small platinum nano-film layer on the surface of the silica sphere prepared in Example 1 of the present invention. figure 1 The medium and dark parts are platinum nanoparticles, the average particle size of platinum nanoparticles is 0.7nm, and the light parts are silica balls and the RF resin coating layer. The inset is a high-resolution transmission electron microscope picture in this example.

Example Embodiment

[0042] Example 2:
[0043] 1) Preparation of ~100nm silica balls: Add 15mL of ethyl orthosilicate (TEOS) to a mixed solution consisting of 294mL of ethanol, 24mL of deionized water and 7.5mL of aqueous ammonia (28wt%), and stir at room temperature for 12 hours, Centrifuge the silicon ball and redisperse it into 50 mL isopropanol (HPLC grade), then add 0.1 mL 3-amino-4-hydroxybenzene sulfonic acid (APS), reflux at 70°C for 10 hours, then centrifuge and use the solid part The mixture of anhydrous ethanol and water is cleaned and re-dispersed in 150ml of anhydrous ethanol to obtain a base dispersion after amino modification.
[0044] 2) Preparation of ultra-small platinum nanoparticle film layer on the surface of the silicon ball. Take 3mL of the amino-modified base dispersion prepared in step 1) and add it to a mixture of 20mL of absolute ethanol, 125mL of deionized water and 0.2mL of aqueous ammonia (28wt%), and add 0.3g of dodecyl Sodium benzene sulfonate (SDBS), stir evenly to obtain a base mixture. Mix resorcinol into a 25g/L solution, add K 2 PtCl 4 Prepare a 0.1mol/L solution. Take 10mL prepared resorcinol solution and 4mL K 2 PtCl 4 The solution was mixed with 0.42mL formaldehyde solution (37wt%) and added to the above-mentioned base mixture. After stirring for 24 hours in a water bath at 28°C, it was refluxed at 70°C for 10 hours, and then centrifuged. The solid part was composed of absolute ethanol and After the water mixture is washed several times, it is dried in an oven at 60°C, that is, a precious metal nanoparticle layer is prepared on the surface of the substrate to obtain an organic hydrogenation reaction catalyst based on precious metal nanoparticles.
[0045] figure 2 This is a transmission electron microscope picture of the ultra-small platinum nano-film layer on the surface of the silica sphere prepared in Example 2 of the present invention. figure 2 The medium and dark parts are platinum nanoparticles, the average particle size of platinum nanoparticles is 1.2nm, and the light parts are silica balls and the RF resin coating layer. The inset is a high-resolution transmission electron microscope picture in this example.

Example Embodiment

[0046] Example 3:
[0047] 1) Preparation of ~100nm silica balls: Add 15mL of ethyl orthosilicate (TEOS) to a mixed solution consisting of 294mL of ethanol, 24mL of deionized water and 7.5mL of aqueous ammonia (28wt%), and stir at room temperature for 12 hours, Centrifuge the silicon ball and redisperse it into 50 mL isopropanol (HPLC grade), then add 0.1 mL 3-amino-4-hydroxybenzene sulfonic acid (APS), reflux at 70°C for 10 hours, then centrifuge and use the solid part The mixture of anhydrous ethanol and water is cleaned and re-dispersed in 150ml of anhydrous ethanol to obtain a base dispersion after amino modification.
[0048] 2) Preparation of ultra-small platinum nanoparticle film layer on the surface of the silicon ball. Take 3mL of the amino-modified base dispersion prepared in step 1) and add it to a mixture of 20mL of absolute ethanol, 125mL of deionized water and 0.2mL of aqueous ammonia (28wt%), and add 0.3g of dodecyl Sodium benzene sulfonate (SDBS), stir evenly to obtain a base mixture. Mix resorcinol into a 25g/L solution, add K 2 PtCl 4 Prepare a 0.1mol/L solution. Take 10mL of the prepared resorcinol solution and 20mL K 2 PtCl 4 The solution was mixed with 0.42mL formaldehyde solution (37wt%) and added to the above-mentioned base mixture. After stirring for 24 hours in a water bath at 28°C, it was refluxed at 70°C for 10 hours, and then centrifuged. The solid part was composed of absolute ethanol and After washing the water mixture several times, it is dried in an oven at 60°C, that is, a precious metal nanoparticle layer is prepared on the surface of the substrate, and an organic hydrogenation reaction catalyst based on precious metal nanoparticles is obtained.
[0049] image 3 This is a transmission electron microscope picture of the ultra-small platinum nano-film layer on the surface of the silica sphere prepared in Example 3 of the present invention. image 3 The medium and dark parts are platinum nanoparticles, the average particle size of the platinum nanoparticles is 2.4nm, and the light parts are silica balls and the RF resin coating layer. The inset is a high-resolution transmission electron microscope picture in this example.
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PUM

PropertyMeasurementUnit
The average particle size0.7nm
The average particle size1.2nm
The average particle size2.4nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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