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A method for the controllable synthesis of noble metal nanocatalysts using amino acids as soft templates

A nano-catalyst and amino acid technology, which is applied in the direction of nanotechnology, can solve the problems of toxic substances, unfavorable green and environmental protection synthesis concepts, etc., and achieve high reproducibility, good dispersion and stability, and simple preparation methods.

Active Publication Date: 2017-04-12
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these functional molecules will produce certain toxic substances in the process of preparing noble metal nanoparticles, which is not conducive to the construction of green and environmentally friendly synthesis concepts.

Method used

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  • A method for the controllable synthesis of noble metal nanocatalysts using amino acids as soft templates
  • A method for the controllable synthesis of noble metal nanocatalysts using amino acids as soft templates
  • A method for the controllable synthesis of noble metal nanocatalysts using amino acids as soft templates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for controllable synthesis of noble metal nano-catalysts using amino acids as soft templates includes the following steps:

[0035] (1) Pipette 0.5 ml 0.5 M lysine solution and 1.0 ml 0.05 M K 2 PtCl 4 The solution was added to 8 ml of deionized water and mixed with ultrasound to form uniform lysine-K 2 PtCl 4 Complex solution

[0036] (2) Add Lysine-K under stirring 2 PtCl 4 Add 50 mg of polyvinylpyrrolidone (PVP) to the complex solution and adjust the pH of the mixed solution to 9.0;

[0037] (3) Add 0.5 ml of HCHO (40%wt) solution to the mixed solution of step (2), and then put it into a hydrothermal reactor; place the reactor in a dry box at 160°C for 4 hours;

[0038] (4) After centrifugal separation, washing, and vacuum drying of the obtained black suspended matter, the Pt nanoparticles with controllable synthesis of lysine are obtained.

[0039] Observe the TEM of the Pt nanoparticles prepared above, as attached figure 1 As shown, the Pt nanoparticles have a hexa...

Embodiment 2

[0041] A method for controllable synthesis of noble metal nano-catalysts using amino acids as soft templates includes the following steps:

[0042] (1) Pipette 0.4 ml 0.5 M arginine solution and 0.5 ml 0.05 M PdCl 2 The solution was added to 8 ml of deionized water and mixed with ultrasound to form uniform arginine-PdCl 2 Complex solution

[0043] (2) Under agitation to arginine-PdCl 2 Add 50 mg of polyvinylpyrrolidone (PVP) to the complex solution and adjust the pH of the mixed solution to 12.0;

[0044] (3) Add 0.5 ml of HCHO (40%) solution to the mixed solution of step (2), and then put it into a hydrothermal reactor; place the reactor in a dry box at 140°C for 4 hours;

[0045] (4) After centrifugal separation, washing, and vacuum drying of the obtained black suspended matter, the Pd nanoparticles with controllable synthesis of arginine are obtained.

[0046] Observe the TEM of the Pd nanoparticles prepared above, as attached figure 2 As shown, the Pd nanoparticles have a uniformly...

Embodiment 3

[0048] A method for controllable synthesis of noble metal nano-catalysts using amino acids as soft templates includes the following steps:

[0049] (1) Pipette 0.4 ml 0.5 M lysine solution and 0.5 ml 0.05 M PdCl 2 The solution was added to 8 ml of deionized water and mixed with ultrasound to form uniform lysine-PdCl 2 Complex solution

[0050] (2) Add Lysine-PdCl under stirring 2 Add 50 mg of polyvinylpyrrolidone (PVP) to the complex solution and adjust the pH of the mixed solution to 12.0;

[0051] (3) Then put the mixed solution of step (2) into a hydrothermal reaction kettle (note: there is no HCHO in this example), and place it in a drying box at 140°C for 2 h;

[0052] (4) After centrifugal separation, washing, and vacuum drying of the obtained black suspended matter, the Pd nanoparticles with controllable synthesis of lysine are obtained.

[0053] Observe the TEM image of the Pd nanoparticles prepared above, as attached image 3 As shown, the Pd nanoparticles have a chain morpholo...

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Abstract

The invention relates to the field of precious metal nanocatalyst preparation, and discloses a preparation method for regulating and controlling the structure and morphology of precious metal nanocatalyst with amino acid as soft templates. According to the method, precious metal salt serves as precursors, polyvinylpyrrolidone (PVP) and amino acid serve as dispersion agents and the soft templates respectively, and the amino-acid-oriented precious metal nanocatalyst is constructed through a hydrothermal route. By regulating the type and addition amount of amino acid, hexahedral, branch-shaped and chain-shaped precious metal nanoparticles with the controllable morphology and sizes can be obtained, and the high reproducibility is achieved. Due to the fact that amino acid is rich in resource and low in price, the preparation method is economical, easy and suitable for industrial large-scale production, and has good application prospects in the field of heterogeneous catalysis and electric catalysis.

Description

Technical field [0001] The invention relates to a method for preparing a precious metal nano catalyst, in particular to a method for preparing a precious metal nano catalyst structure and morphology by using amino acid as a soft template. Background technique [0002] Fuel cells (including alcohol, acid and ammonia fuel cells, etc.) can directly convert chemical energy into electrical energy. They have the advantages of high energy conversion efficiency, low pollution, and diversified fuels. They are recognized as highly efficient and green energy conversion technologies. , Has always been regarded as a potential energy device for automobiles, portable or fixed power systems. [0003] Due to the "geometric effect" and "crystal surface effect", noble metal nanocatalysts with specific morphologies and sizes have attracted widespread attention in the fields of industrial catalysis and fuel cells. An important method to improve electrocatalytic performance is to control the morphology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00B01J23/42B01J23/44
Inventor 唐亚文付更涛孙冬梅陈煜吴平周益明
Owner NANJING NORMAL UNIVERSITY
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