Preparation method of tubular metal catalyst

A metal catalyst and tubular technology, which is applied in the field of preparation of tubular metal catalysts, can solve the problems of complex synthesis method, limited application, tube wall thickness of platinum nanotubes, etc.

Inactive Publication Date: 2012-04-11
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the methods reported above all have the following problems, that is, the more active precursor template Ag, Se and Te and other toxic metal materials are consumed, and the method is complicated and difficult to control.
[0004] Template electrochemical method is another important method for synthesizing tubular metal catalysts. For example, German "Advanced Functional Materials" (Advanced Materials, 16 issue 1550 pages in 2004) reported the use of multi-step template method to synthesize platinum nanotubes, but

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  • Preparation method of tubular metal catalyst

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preparation example Construction

[0043] The invention discloses a method for preparing a tubular metal catalyst, comprising:

[0044] Step a) the first metal salt and sodium nitrate (NaNO 3 ) was dissolved in dimethylsulfoxide (DMSO) to obtain a mixed solution;

[0045] Step b) using the alumina porous mold with nanoscale pores as a template, performing electrochemical deposition of the mixed solution at the nanoscale pores, and obtaining a tubular metal catalyst after removing the template, the work of the electrochemical deposition The voltage is -0.8V ~ -1.8V.

[0046] In the present invention, the first metal salt is preferably platinum dichloride (PtCl 2 ), palladium dichloride (PdCl 2 ), chloroauric acid (AuCl 3 ·HCl·4H 2O), silver nitrate (AgNO 3 ) and cuprous bromide (CuBr) in one or more. Since the method provided by the invention can prepare single-component tubular metal catalysts and multi-component metal tubular catalysts, when preparing single-component metal tubular catalysts, the first ...

Embodiment 1

[0056] The electrochemical synthesis of embodiment 1 single-component palladium tubular metal catalyst

[0057] Add 0.177g PdCl to a 100mL beaker 2 With 50mL DMSO (Shanghai Sinopharm Group), dissolve part of PdCl with mechanical stirring 2 Afterwards, keep it sealed for an hour until the undissolved PdCl 2 After turning into white, stir and dissolve again, and so on, until all PdCl 2 After the dissolution is complete, add 100mM / L NaNO 3 Supporting electrolyte, sealed and left overnight to obtain the first mixed solution;

[0058] One side of the commercially available alumina template produced by British Whatman Company is steamed with a gold layer with a thickness of 40nm to form a ring-shaped base electrode, and the alumina template has a hole diameter of about 300nm (obtained by scanning electron microscopy);

[0059] A 100mL beaker was used as an electrolytic cell, and the above-mentioned alumina template was used as a template, and the first mixed solution was subject...

Embodiment 2～4

[0063] Using the same preparation method as in Example 1, using PtCl 2 , AuCl 3 ·HCl·4H 2 O and AgNO 3 It is a metal salt, the working voltage of electrochemical deposition is -1.3V, -1.5V, -1.0V respectively; the electrochemical deposition time is 6h, 5h, 1h respectively; the number of moles of sodium hydroxide solution used is 1M / L ; One-component Pt tubular metal catalyst, Au tubular metal catalyst and Ag tubular metal catalyst were prepared respectively. The scanning electron microscope pictures of the Pt tubular metal catalyst, Au tubular metal catalyst and Ag tubular metal catalyst prepared by embodiments 2~4 are as follows respectively Image 6 , Figure 7 with Figure 8 shown.

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Abstract

The invention discloses a preparation method of tubular metal catalyst comprising dissolving metal salt and sodium nitrate in dimethyl sulfoxide to obtain mixed solution; taking aluminum oxide porous template with nano path as template, conducting electrochemical deposition of the mixed solution at the nano path, and removing the template to obtain the tubular metal catalyst. The invention takes polar aprotic solvent dimethyl sulfoxide (DMSO) as solvent and electrolyte, since DMSO contains S group with weak absorption effect to metal surface, when metal is reduced to particles, DMSO moleculeswill absorb on the particle surface to inhibit the particle from growing large to make the prepared tubular metal catalyst wall thin and to increase the activated area. Furthermore, DMSO with relatively wide electrochemical window, high dielectric constant and high viscosity can ensure the prepared tubular metal catalyst wall is thin and made of particles, the length diameter ratio is high and the wall is uniform.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a method for preparing a tubular metal catalyst. Background technique [0002] As the world's population grows, humans are often limited by the ability to supply electrical energy to support their activities. Fuel cells can convert chemical raw materials such as hydrogen and oxygen into electrical energy, thus providing a solution to ensure the supply of electrical energy, that is, fuel cells directly convert chemical energy into electrical energy, under the action of metal catalysts, hydrogen, etc. The fuel, air (oxygen) acts as an oxidant to generate electricity and a small amount of heat. Moreover, the product discharged after the fuel cell generates electric energy is water, which meets the requirements of environmental protection and solves the inherent pollution problem of the combustion process. Therefore, the fuel cell can be widely used in the fields of electric ener...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/44B01J23/50B01J23/52B01J23/89B01J35/02B01J37/34
Inventor 俞书宏崔春华李会会
Owner UNIV OF SCI & TECH OF CHINA
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