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A kind of catalyst carrier, precious metal catalyst and its preparation method and application

A precious metal catalyst, catalyst carrier technology, applied in catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve electrochemical corrosion, electrochemical corrosion of carbon materials and other problems, achieve strong electrochemical corrosion resistance, High conductivity and improved electrocatalytic stability

Active Publication Date: 2021-01-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the long-term working environment, such as acidic system and high oxidation potential, carbon materials will face serious electrochemical corrosion problems
Although the modification of metal compounds can improve the corrosion resistance of carbon supports to a certain extent, the part of the carbon material directly exposed to the electrolyte solution still inevitably faces the problem of electrochemical corrosion.

Method used

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  • A kind of catalyst carrier, precious metal catalyst and its preparation method and application
  • A kind of catalyst carrier, precious metal catalyst and its preparation method and application
  • A kind of catalyst carrier, precious metal catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]Preparation of tantalum pentoxide / tantalum carbide composite coated hollow carbon microsphere carrier supported platinum nanoparticle catalyst (Pt / Ta2O5-TaC / C), add a mixture of 12 mL of styrene monomer and 0.7 g of divinylbenzene crosslinker into a three-necked flask, add 130 mL of deionized water, and heat in an oil bath at 70°C and 350 rpm Stir while blowing in argon for 1 h to remove dissolved oxygen. Then, add 10 mL with a mass fraction of 0.005 g mL-1Potassium persulfate aqueous solution, and the mixture was heated at 70 ºC for 10 h under argon. After the solution is cooled, saturated sodium chloride is added to demulsify, the obtained monodisperse crosslinked polystyrene microspheres are collected by filtration, washed with deionized water, and then dried at 60°C. Disperse 3 g of cross-linked polystyrene microspheres in 100 mL of concentrated sulfuric acid solution and stir at 350 rpm at 40 ºC for 6 h. After cooling, the product was washed with deionized water until the...

Embodiment 2

[0045]The operating conditions were the same as in Example 1, except that the carbonization process was carried out. The temperature in the second heating process was 800 °C, and the tantalum pentoxide coated hollow carbon microsphere carrier supported platinum nanoparticle catalyst was prepared. The specific surface area of ​​the hollow carbon microsphere carrier coated with tantalum pentoxide is 249.1 m2 g-1. The oxygen reduction polarization curve can be calculated, and the kinetic current density of the platinum catalyst based on this support under the condition of 0.9 V vs. RHE (Jk) 1.85 mA cm respectively-2,Platinum loading on the electrode surface (mpt ) Respectively 15 ug cm-2. Therefore, it can be calculated that the platinum catalyst based on this support has a mass activity of 0.123 A mg for oxygen reduction reaction at 0.9 V.–1Pt, Better than commercial platinum carbon catalyst. The sample was subjected to a potential cycle acceleration stability test, and the test condi...

Embodiment 3

[0047]The operating conditions are the same as those in Example 1, except for the carbonization process. The temperature in the second heating process is 1100 °C, and the tantalum carbide coated hollow carbon microsphere carrier is prepared to support the platinum nanoparticle catalyst. The specific surface area of ​​the tantalum carbide coated hollow carbon microsphere carrier is 442.5 m2 g-1. The oxygen reduction polarization curve can be calculated, and the kinetic current density of the platinum catalyst based on the support under the condition of 0.9V vs. RHE (Jk) Respectively 2.31 mA cm-2,Platinum loading on the electrode surface (mpt ) Respectively 15 ug cm-2. Therefore, it can be calculated that the platinum catalyst based on this support has a mass activity of 0.154 A mg for oxygen reduction reaction at 0.9 V.–1Pt, Better than commercial platinum carbon catalyst. The sample was subjected to a potential cycle accelerated stability test under the same test conditions as in Ex...

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Abstract

The invention relates to a catalyst carrier, a precious metal catalyst and a preparation method and application thereof. Using cross-linked polystyrene microspheres as sacrificial templates, transition metal compound-coated hollow carbon microspheres were prepared by combining solvothermal and one-step carbonization methods, and used as carriers to load precious metal nanoparticles through wet chemical reduction. It is uniformly anchored on the surface of transition metal compound-coated hollow carbon microspheres. The catalyst has the advantages of strong electrochemical corrosion resistance and large specific surface area, and shows excellent catalytic performance in electrochemical reactions such as oxygen reduction, hydrogen evolution, and methanol oxidation.

Description

Technical field[0001]The invention belongs to the technical field of catalyst preparation, and relates to a catalyst carrier, a precious metal catalyst, and a preparation method and application thereof, in particular to a transition metal compound-coated hollow carbon microsphere carrier supported precious metal nanoparticle catalyst, and a preparation method and its application. Application of electrochemical catalytic reaction.Background technique[0002]The energy and environmental challenges facing the world today are becoming increasingly severe, and the development of green and clean renewable energy is urgently needed. Hydrogen is considered to be an ideal energy carrier due to its zero pollution and high energy density. In the context of the hydrogen economy, the technology of hydrogen production by electrolysis of water has become one of the efficient energy conversion processes for obtaining high-purity hydrogen fuel, and finally the promotion of hydrogen energy through rene...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J27/22B01J35/08B01J35/10
CPCB01J27/22B01J35/397B01J35/33B01J35/51B01J35/615
Inventor 王峰高文彬窦美玲宋夜
Owner BEIJING UNIV OF CHEM TECH
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