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Controllable precious metal nanocatalyst synthesis method with amino acid as soft templates

A nano-catalyst, amino acid technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Achieve the effects of good dispersion and stability, high reproducibility, and economical preparation method

Active Publication Date: 2015-05-13
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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  • Controllable precious metal nanocatalyst synthesis method with amino acid as soft templates
  • Controllable precious metal nanocatalyst synthesis method with amino acid as soft templates
  • Controllable precious metal nanocatalyst synthesis method with amino acid as soft templates

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A kind of method that utilizes amino acid as soft template controllable synthesis noble metal nano-catalyst, comprises 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 deionized water and mixed sonicated to form a homogeneous Lysine-K 2 PtCl 4 complex solution;

[0036] (2) Under the action of stirring, the lysine-K 2 PtCl 4 Add 50 mg polyvinylpyrrolidone (PVP) to the complex solution to adjust the pH of the mixed solution to 9.0;

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

[0038] (4) After the obtained black suspension is centrifuged, washed, and vacuum-dried, the Pt nanoparticles synthesized by the controllable lysine are obtained.

[0039] Observe the TEM of the Pt nanoparticles prepared above, as attachedfigure 1 As shown, the Pt nanoparticles ...

Embodiment 2

[0041] A kind of method that utilizes amino acid as soft template controllable synthesis noble metal nano-catalyst, comprises 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 deionized water and mixed sonicated to form a homogeneous arginine-PdCl 2 complex solution;

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

[0044] (3) Add 0.5 ml HCHO (40%) solution to the mixed solution in step (2), and then put it into a hydrothermal reaction kettle; place the reaction kettle in a drying oven at 140°C for 4 h;

[0045] (4) After the obtained black suspension is centrifuged, washed, and vacuum-dried, the Pd nanoparticles synthesized by the controllable arginine are obtained.

[0046] Observe the TEM of the Pd nanoparticles prepared above, as attached figure 2 As shown, the Pd nanoparticles are un...

Embodiment 3

[0048] A kind of method that utilizes amino acid as soft template controllable synthesis noble metal nano-catalyst, comprises 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 deionized water and mixed sonicated to form a homogeneous lysine-PdCl 2 complex solution;

[0050] (2) Under the action of stirring, the lysine-PdCl 2 Add 50 mg polyvinylpyrrolidone (PVP) to the complex solution to adjust the pH of the mixed solution to 12.0;

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

[0052] (4) The obtained black suspension is centrifuged, washed, and vacuum-dried to obtain the Pd nanoparticles controlledly synthesized from lysine.

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

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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 preparation method of a noble metal nano-catalyst, in particular to a preparation method of using an amino acid as a soft template to regulate the structure and morphology of the noble metal nano-catalyst. Background technique [0002] Fuel cells (including alcohol, acid and ammonia fuel cells, etc.) can directly convert chemical energy into electrical energy, which has the advantages of high energy conversion efficiency, low pollution, and diversified fuels, and is recognized as an efficient and green energy conversion technology , has long been regarded as a potential energy device for automotive, portable or stationary power systems. [0003] Due to the "geometric effect" and "crystal plane effect", noble metal nanocatalysts with specific shapes and sizes have attracted widespread attention in the fields of industrial catalysis and fuel cells. An important method to improve the electrocatalytic performance is to control ...

Claims

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Application Information

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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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