Nitrogen-doped porous hollow carbon catalyst embedded in platinum-rhodium alloy, preparation method and application thereof

A technology of antimony alloy and nitrogen doping, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of short life, short service life, high cost of proton exchange membrane electrodes, etc., to achieve The effect of preventing agglomeration

Active Publication Date: 2019-05-21
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead dioxide has good electrical conductivity and a large overpotential, but it is consumed and dissolved during use, resulting in a short service life
[0005] Therefore, the primary restrictive factors for the commercial development of electrolytic ozone generators are the high cost and short life of proton exchange membrane electrodes.

Method used

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  • Nitrogen-doped porous hollow carbon catalyst embedded in platinum-rhodium alloy, preparation method and application thereof
  • Nitrogen-doped porous hollow carbon catalyst embedded in platinum-rhodium alloy, preparation method and application thereof
  • Nitrogen-doped porous hollow carbon catalyst embedded in platinum-rhodium alloy, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of a catalyst based on a 1-3 nm platinum-antimony alloy embedded in nitrogen-doped porous hollow carbon comprises the following steps:

[0033] 1) 0.023 g of chloroplatinic acid and 0.002 g of antimony chloride were dissolved in 20 mL of ethylene glycol and refluxed in an oil bath at 150 °C for 3 h under nitrogen bubbling. After cooling to room temperature, 2 mL of hydrochloric acid (1 mol / L ), and then centrifuged to obtain viscous matter dispersed in 20mL of water to obtain a suspension of platinum-antimony alloy nanoparticles (the concentration of the platinum-antimony alloy nanoparticles in the suspension is 1.3g / L).

[0034] 2) Add 20 mL of the aqueous suspension of platinum-antimony alloy nanoparticles obtained in step 1) into 60 mL of methanol solution containing 1 g of zinc chloride and 4 g of dimethylimidazole; stir vigorously for 1 h, and the resulting turbid solution is left to stand for 24 h. Place, filter, and vacuum-dry; obtain solid powder...

Embodiment 2

[0040] The preparation of a catalyst based on a 3-6 nm platinum-antimony alloy embedded nitrogen-doped porous hollow carbon comprises the following steps:

[0041] 1) Disperse 0.023 g of chloroplatinic acid, 0.002 g of antimony chloride, and 150 mg of PVP in 200 mL of ethanol and reflux in an oil bath at 80 °C for 2 h under nitrogen protection. The resulting mixture was removed by rotary evaporation After the solvent was removed, acetone was added to the residue of rotary evaporation to obtain a turbid mixed solution, and the viscous obtained by centrifugation was dispersed in 20 mL of water to obtain a suspension water of platinum-antimony alloy nanoparticles (the platinum-antimony alloy nanoparticles were in the suspension. The concentration is 1.3 g / L).

[0042] 2) Add 20 mL of the aqueous suspension of platinum-antimony alloy nanoparticles obtained in step 1) to 60 mL of methanol solution containing 1 g of zinc chloride and 4 g of dimethylimidazole; stir vigorously for 1 h...

Embodiment 3

[0048] The preparation of a catalyst based on a 4-7 nm platinum-antimony alloy embedded nitrogen-doped porous hollow carbon comprises the following steps:

[0049] 1) Disperse 0.023 g of chloroplatinic acid, 0.002 g of antimony nitrate and 150 mg of PVP in 200 mL of ethanol, under the condition of nitrogen protection, reflux for 2 h in an oil bath at 80 °C, and remove the solvent by rotary evaporation Finally, add acetone to the rotary steaming residue to obtain a turbid mixed solution, and disperse the viscous substance in 20mL water through centrifugation to obtain the suspension water of platinum-antimony alloy nanoparticles (the concentration of the platinum-antimony alloy nanoparticles in the suspension is is 1.3 g / L).

[0050] 2) Add 20 mL of the aqueous suspension of platinum-antimony alloy nanoparticles obtained in step 1) to 60 mL of methanol solution containing 1 g of zinc chloride and 4 g of dimethylimidazole; stir vigorously for 1 h, and the resulting cloudy soluti...

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Abstract

The invention discloses a platinum-antimony alloy embedded nitrogen-doped porous hollow carbon catalyst, a preparation method thereof and application thereof. The preparation method of the catalyst ofthe invention comprises the following steps: adding a suspension of platinum-antimony alloy nanoparticles, a zinc salt and an imidazole substance into a first alcohol solvent, stirring vigorously, standing, filtering and drying to obtain a platinum-antimony alloy nanoparticle-coated solid powder, dispersing the solid powder in distilled water, adding an aqueous solution of an organic acid or an organic acid salt, stirring vigorously and standing, filtering, and drying to obtain a solid powder adsorbing an organic acid anion, and finally roasting at high temperature in the high-purity gas atmosphere so as to prepare the platinum-antimony alloy embedded nitrogen-doped porous hollow carbon catalyst. The catalyst of the invention has high electrocatalytic activity and superior stability, andobviously improves the current efficiency of ozone generation by an electrolytic ozone generator during electrolysis of water for preparation of ozone. In addition, the performance of the catalyst forelectrolysis of water and catalytic preparation of ozone is better than performance of lead dioxide.

Description

technical field [0001] The invention relates to a platinum-antimony alloy embedded in a nitrogen-doped porous hollow carbon catalyst, a preparation method and application thereof. Background technique [0002] Ozone (O 3 ), with a relative molecular mass of 48, is a kind of oxygen allotrope. It is an unstable light blue gas at room temperature, has a special odor, is chemically unstable, and will quickly decompose into oxygen. Because ozone has strong oxidizing properties, it can effectively kill microorganisms such as viruses and bacteria, and can quickly oxidize and decompose organic matter. Ozone not only has a strong sterilization effect, but also is a multifunctional strong oxidant in industry, and is widely used in water treatment, industrial water treatment, food preservation and air purification; in addition, ozone is used in medical treatment It is also widely used as a health-enhancing agent, which can increase the oxygen content in the blood, and has a good effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/13B01J27/24
Inventor 王建国袁博文钟兴
Owner ZHEJIANG UNIV OF TECH
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