Supported nano-alloy catalyst and universal preparation method

A nano-alloy and catalyst technology, which is applied in the field of nano-alloy catalyst preparation, can solve the problems of reducing platinum utilization, burying active sites, high-temperature agglomeration of nanoparticles, etc., and achieves the effects of small size, uniform distribution and excellent performance

Pending Publication Date: 2022-06-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, surfactants are usually unavoidably used in the synthesis of small-sized alloy catalysts, and there is a problem that residues remain on the alloy surface after removal, burying active sites, and severely reducing the utilization of platinum.
At the same time, the problem of high-temperature agglomeration of nanoparticles also needs to be solved urgently.
Therefore, the synthesis of small-sized, uniformly distributed alloy catalysts without the use of surfactants is currently a great challenge.

Method used

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  • Supported nano-alloy catalyst and universal preparation method
  • Supported nano-alloy catalyst and universal preparation method
  • Supported nano-alloy catalyst and universal preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: 500mg of silica microspheres were dispersed in 40mL of water, 1g of cobalt nitrate was added for 20min, and then the reaction was stirred at 80 °C for 16h, centrifuged, separated, vacuum dried after the reaction, and the resulting product was roasted for 30 min at 400 °C under an air atmosphere to obtain the precursor.

[0036] Step 2: Disperse the precursor in a solution containing 20 mL of water and 20 mL of ethanol, Add 0.0386 mmol chloroplatinic acid containing 10 mL volume ratio of 1:1 water and ethanol mixed solution stirred reaction for 6 h, and then weigh 1.0 mmol dopamine dissolved in 30 mL volume ratio of 1:1 water and ethanol mixed solution was added to the stirring reaction for 5 h, and then added 8 mL volume ratio of 2 mL ammonia water volume ratio of 1:1 water and ethanol mixed solution, continue to stir the reaction at room temperature for 12 h, after the reaction is over, the product is put into the tubular furnace under a nitrogen atmosphere at 5 °C...

Embodiment 2

[0038]Step 1: 500mg of silica microspheres were dispersed in 40mL of water, 1g of nickel nitrate was added for ultrasonic dispersion for 20min, and then the reaction was stirred at 80 °C for 14h, centrifuged, separated, vacuum dried after the reaction, and the resulting product was roasted at 400 °C under an air atmosphere for 30 min to obtain the precursor.

[0039] Step 2: Disperse the precursor in a solution containing 20 mL of water and 20 mL of ethanol, Add 0.0386 mmol chloroplatinic acid containing 10 mL volume ratio of 1:1 water and ethanol mixed solution stirred reaction for 6h, and then weigh 1.2 mmol dopamine dissolved in 30 mL volume ratio of 1:1 water and ethanol mixed solution added to the stirring reaction for 3 h, and then add 8 mL of ammonia containing 2 mL of water volume ratio of 1:1 water and ethanol mixed solution, continue to stir the reaction at room temperature for 12 h, after the reaction is over, the product is put into the tubular furnace under a nitrogen...

Embodiment 3

[0041] Step 1: 500mg of silica microspheres were dispersed in 40mL of water, 1g of iron nitrate was added to the ultrasonic dispersion for 20min, and then the reaction was stirred at 80 °C for 12h, centrifuged, separated and vacuum dried after the reaction, and the resulting product was roasted for 30 min at 400 °C under an air atmosphere to obtain the precursor.

[0042] Step 2: Disperse the precursor in a solution containing 20 mL of water and 20 mL of ethanol, Add 0.0386 mmol chloroplatinic acid containing 10 mL volume ratio of 1:1 water and ethanol mixed solution stirred reaction for 6 h, and then weigh 1.5 mmol dopamine dissolved in 30 mL volume ratio of 1:1 water and ethanol mixed solution was added to the stirring reaction for 3 h, and then added 8 mL of ammonia water volume ratio of 1:1 water and ethanol mixed solution, continue to stir the reaction at room temperature for 12 h, after the reaction is over, the product is put into the tubular furnace under a nitrogen atmosp...

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Abstract

The invention relates to a supported nano-alloy catalyst and a preparation method thereof.The preparation method comprises the steps that firstly, silica nanoparticles serve as a template, metal ions are introduced through cation exchange, and a precursor containing stable metal (hydrogen) oxide is formed; the surface of the precursor is coated with a layer of polymer while the precursor is impregnated with noble metal ions, metal alloying is achieved through high-temperature treatment in inert gas, and the hollow carbon-nitrogen carrier loaded alloy nano-frame catalyst is obtained through template etching. The prepared catalyst takes carbon nitrogen with a hollow structure as a carrier, and a small-size nano frame alloy is uniformly loaded on the surface. A double-layer space confinement pyrolysis strategy is adopted, a surfactant is not needed in the alloy preparation process, the synthesized nano-frame alloy is small in size and uniform in distribution, residual shielding active sites of the surfactant are overcome, and the problem of high-temperature agglomeration of nano-particles is solved. The method has universality and is suitable for synthesis of various nano-frame alloy catalysts. The catalyst has excellent performance and can be used in the field of electro-catalysis.

Description

Technical field [0001] The present invention belongs to the field of nanoalloy catalyst preparation technology, relates to a supported nanoalloy catalyst and a universal preparation method, specifically relates to a bilayer space limiting strategy method for preparing hollow carbon nitrogen microspheres supported precious metals - non-precious metal nanoalloy composites. Background [0002] Precious metal alloying, one of the important methods to solve the problem of scarcity and high price of precious metals, has attracted widespread attention from researchers. Introducing another transition metal into the lattice of the precious metal to regulate the electronic and lattice structure helps to reduce the amount of precious metal used on the one hand, thereby reducing costs, and on the other hand, can improve the electrocatalytic activity. It has been reported that the introduction of inexpensive 3D transition metals (such as Fe, Co, Ni, Cu, Ln, Zn, etc.) into the lattice of the P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08B01J37/00
CPCB01J27/24B01J37/0018B01J37/088B01J37/084
Inventor 韩云虎陈雯陈冠震
Owner NORTHWESTERN POLYTECHNICAL UNIV
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