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Catalyst formed by controlling different calcination conditions and containing vanadium oxides with different valence states as well as synthesis method and application of catalyst

A technology of vanadium oxide and synthesis method, which is applied in the direction of vanadium oxide, electrolytic components, electrolytic process, etc., can solve the problems of poor catalytic effect of vanadium oxide, and achieve excellent cycle stability, good selectivity, and good electrochemical activity Effect

Pending Publication Date: 2022-07-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This is also the reason why the catalytic effect of vanadium oxide prepared by this method is not good.

Method used

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  • Catalyst formed by controlling different calcination conditions and containing vanadium oxides with different valence states as well as synthesis method and application of catalyst
  • Catalyst formed by controlling different calcination conditions and containing vanadium oxides with different valence states as well as synthesis method and application of catalyst
  • Catalyst formed by controlling different calcination conditions and containing vanadium oxides with different valence states as well as synthesis method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]The preparation of uncalcined vanadium pentoxide includes the following steps:

[0041] At room temperature (20-30°C), weigh 23.3g of sodium vanadate and place it in a 100mL beaker, add a certain amount of water to dissolve, and set the volume to a 250mL volumetric flask, then take 50mL of the prepared sodium vanadate solution and pour it into In a 250mL beaker, add ammonia water with a concentration of 10 to 15% dropwise to adjust the pH between 4 and 6. By treating the sodium vanadate solution with 50mL of 1mol / L ammonium sulfate solution, ammonium vanadate (ammonium decavanadate) is precipitated. Sodium precipitate), separate the resulting precipitate from the solution, dissolve it in 20 mL of hot water at 80°C to obtain an ammonium vanadate solution, and then add 20 mL of dilute sulfuric acid (concentration: 0.1 mol / L) to the obtained hot solution. ) treatment, then the precipitate was separated, washed with water and ethanol for many times, and then vacuum-dried at ...

Embodiment 2

[0043] 100 ℃ calcination to prepare V 2 O 5 -100, including the following steps:

[0044] At room temperature (20-30°C), weigh 23.3g of sodium vanadate and place it in a 100mL beaker, add a certain amount of water to dissolve, and set the volume to a 250mL volumetric flask, then take 50mL of the prepared sodium vanadate solution and pour it into In a 250mL beaker, add ammonia water with a concentration of 10 to 15% dropwise to adjust the pH between 4 and 6. By treating the sodium vanadate solution with 50mL of 1mol / L ammonium sulfate solution, ammonium vanadate (ammonium decavanadate) is precipitated. Sodium precipitate), separate the resulting precipitate from the solution, dissolve it in 20 mL of hot water at 80°C to obtain an ammonium vanadate solution, and then add 20 mL of dilute sulfuric acid (concentration: 0.1 mol / L) to the obtained hot solution. ) treatment, then the precipitate was separated, washed with water and ethanol for many times, and then vacuum-dried at 60...

Embodiment 3

[0046] 200 ℃ calcination to prepare V 2 O 5 -200, including the following steps:

[0047] At room temperature (20-30°C), weigh 23.3g of sodium vanadate and place it in a 100mL beaker, add a certain amount of water to dissolve, and set the volume to a 250mL volumetric flask, then take 50mL of the prepared sodium vanadate solution and pour it into In a 250mL beaker, add ammonia water with a concentration of 10 to 15% dropwise to adjust the pH between 4 and 6. By treating the sodium vanadate solution with 50mL of 1mol / L ammonium sulfate solution, ammonium vanadate (ammonium decavanadate) is precipitated. Sodium precipitate), separate the resulting precipitate from the solution, dissolve it in 20 mL of hot water at 80°C to obtain an ammonium vanadate solution, and then add 20 mL of dilute sulfuric acid (concentration: 0.1 mol / L) to the obtained hot solution. ) treatment, then the precipitate was separated, washed with water and ethanol for many times, and then vacuum-dried at 60...

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Abstract

The invention discloses a catalyst containing vanadium oxides with different valence states formed by controlling different calcination conditions and a synthesis method and application of the catalyst. The preparation method of the catalyst comprises the following steps: preparing vanadium pentoxide by taking commercial sodium vanadate as a raw material, and then putting a vanadium pentoxide sample into a tubular furnace; and calcining at different temperatures in a hydrogen atmosphere to obtain a series of vanadium oxide catalyst products with different valence states. Vanadium oxide catalysts with different valence states are prepared through a calcination method, and the method has the advantages of being easy to operate and rapid in synthesis. According to the method, by controlling the temperature and the calcining atmosphere for calcining the catalyst, the influence of the vanadium oxide catalyst with different valence states and different oxygen vacancy contents on the selectivity of preparation of hydrogen peroxide through electrocatalytic oxygen reduction is explored, and the catalyst has relatively high selectivity on a two-electron oxygen reduction reaction; and the catalyst has a good application prospect in the reaction of catalytic preparation of hydrogen peroxide.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a catalyst containing different valence states of vanadium oxides formed by controlling different calcination conditions, and a synthesis method and application thereof. Background technique [0002] Hydrogen peroxide (H2O2) is an important chemical substance, which has a wide range of applications in the fields of industry, medicine, environmental protection, military industry, food and environment. It has both oxidizing and reducing properties and has no secondary pollution after use, and is defined as a green chemical product. Currently about 99% H 2 O 2 It is produced using the anthraquinone (AO) process. However, this process has high energy consumption, high cost and high toxicity, and can only be carried out in centralized factories. The anthraquinone method not only has complicated steps, but also uses some organic solvents, causing secondary p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/30C01G31/02
CPCC25B11/091C25B1/30C01G31/02C01P2004/03C01P2002/72C01P2004/61
Inventor 赵芷琪王建国钟兴应惠娟邵一贞
Owner ZHEJIANG UNIV OF TECH
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