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Multi-element graded metal based nanoparticle catalyst and preparation method therefor

A nanoparticle, metal-based technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems that hinder the application of catalysts, and there is no controllable and efficient means for the regulation of electronic structure. Achieve good crystallinity, uniform particle size distribution, and solve the effect of insufficient activity

Inactive Publication Date: 2015-11-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no controllable and efficient method for the regulation of component stress and electronic structure of multi-component catalysts, which hinders the practical application of such catalysts.

Method used

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  • Multi-element graded metal based nanoparticle catalyst and preparation method therefor
  • Multi-element graded metal based nanoparticle catalyst and preparation method therefor
  • Multi-element graded metal based nanoparticle catalyst and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Preparation of IrNi / C nanoparticles: Disperse nickel chloride, chloroiridic acid and XC-72R in ethylene glycol so that the molar ratio of Ni to Ir precursor is 1:1, and the total mass of all metals in the precursor is The ratio to XC-72R mass is 0.25:1. The pH = 10 was adjusted using NaOH in polyol and the solution was saturated by bubbling argon. Use microwaves to heat the solution to a temperature of 130°C, cool it down to room temperature naturally, wash and dry it, and then IrNi / C can be obtained.

[0045] 2. Then take a certain amount of IrNi / C and chloropalladium acid and disperse them in ethylene glycol. The molar ratio of Ni to Pd is 3:1, and it is protected by argon all the time. Use NaOH polyol solution to adjust the pH to 10, treat in an oil bath for 3 hours, and treat at a temperature of 110°C. The gradient PdIrNi / C composite catalyst can be obtained after washing and drying.

[0046] The IrNi metal alloy nanoparticles synthesized by the first step of ...

Embodiment 2

[0052] 1. Preparation of IrNi / graphene nanoparticles: Disperse nickel chloride, chloroiridic acid and graphite oxide in ethylene glycol so that the molar ratio of Ni to Ir precursor is 0.1:1, and the total mass of all metals in the precursor is The ratio to the mass of graphite oxide is 0.25:1. The pH = 12 was adjusted using NaOH in polyol and the solution was saturated by bubbling argon. Use microwaves to heat the solution to a temperature of 140° C., cool it down to room temperature naturally, wash and dry it, and then IrNi / graphene can be obtained.

[0053] 2. Then take a certain amount of IrNi / graphene, and disperse it in ethylene glycol with chloropalladium acid. The molar ratio of Ni to Pd is 0.1:1, and it is protected by argon all the time. Use NaOH polyol solution to adjust pH=12, treat in oil bath for 5h, and treat at 90°C. The gradient PdIrNi / graphene composite catalyst can be obtained after washing and drying.

Embodiment 3

[0055] 1. Preparation of IrNi / graphene nanoparticles: Disperse nickel chloride, chloroiridic acid and graphite oxide in ethylene glycol so that the molar ratio of Ni to Ir precursor is 0.5:1, and the total mass of all metals in the precursor is The ratio to the mass of graphite oxide is 0.4:1. The pH = 9 was adjusted using NaOH in polyol and the solution was saturated by bubbling argon. Use microwaves to heat the solution to a temperature of 150° C., naturally cool to room temperature, wash and dry, and then obtain IrNi / graphene.

[0056] 2. Then take a certain amount of IrNi / graphene and chloropalladium acid and disperse it in ethylene glycol, the molar ratio of Ni to Pd is 0.1:1, and it is protected by argon all the time. Use NaOH polyol solution to adjust the pH=9, treat in an oil bath for 8 hours, and treat at a temperature of 120°C. The gradient PdIrNi / graphene composite catalyst can be obtained after washing and drying.

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Abstract

The invention discloses a multi-element graded metal based nanoparticle catalyst and a preparation method therefor. The catalyst is a composite catalyst which consists of a carrier and graded metal based nanoparticles carried on the carrier, wherein a mass ratio of the graded metal based nanoparticles to the carrier is (0.01-4) to 1; constituent elements of the graded metal based nanoparticles are metal elements, which are not radioactive and can stably exist in an aqueous solution, in a periodic table of elements; and constituent components and content of particles from inside to outside are changed in a graded mode. The multi-element graded metal based nanoparticle catalyst solves the problems that an original catalyst is high in cost and insufficient in activity, and simultaneously realizes continuous control on electronic structures and crystal face stress of metal components in the catalyst. The multi-element graded metal based nanoparticle catalyst disclosed by the invention has a novel graded hierarchical structure; and continuous modulation on stress and the electronic structure of each component can be realized by regulating metal composition, so that an effective method is provided for synthesizing the multi-element graded metal based nanoparticle catalyst.

Description

technical field [0001] The invention relates to a multi-element metal-based catalyst and a preparation method thereof, in particular to a multi-element gradient metal-based nanoparticle catalyst based on a continuous solvothermal method and a preparation method thereof. Background technique [0002] Catalytic processes exist in many fields such as synthesis and energy conversion, and almost cover the entire chemical and chemical process. Most chemical reactions are extremely slow, and catalysts are usually needed to speed up the reaction to meet practical needs. Metal catalysts are an important class of catalysts, in which nanoscale metal particles have high specific surface area, high active site density, and a series of special catalytic properties due to the particularity of their physical scale. [0003] In the above catalytic process, electrocatalysis has a wide range of applications and has been extensively and deeply studied. Among them, polymer membrane fuel cell (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B82Y30/00B82Y40/00
Inventor 杜春雨伊苏巴鲁 麦库杜磊王雅静孙雍荣尹鸽平高云智左朋建程新群马玉林
Owner HARBIN INST OF TECH
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