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A method for preparing pd-pt heterostructure nanocrystals

A heterogeneous structure and nanocrystalline technology, applied in chemical instruments and methods, metal processing equipment, physical/chemical process catalysts, etc., can solve the problems of limited universal application, low reserves, high price of Pt, etc., and achieve improved catalytic performance. The effect of activity, good controllability and high catalytic activity

Active Publication Date: 2021-10-15
WENZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high price of Pt, small reserves, and various problems in the actual catalytic process severely limit its universal application.

Method used

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  • A method for preparing pd-pt heterostructure nanocrystals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Pre-prepared Pd seed solution stored in ethanol with a concentration of about 641.9mg / L, ultrasonicated for 30-60 minutes to make it evenly dispersed, then took 0.5mL of Pd seed solution to remove the solvent by centrifugation, and dried to avoid the influence of dispersant ethanol reaction.

[0024] Next, ethylene glycol was added to the four above-mentioned seeds, and ultrasonically stirred for 10 minutes to fully disperse them evenly.

[0025] Immediately after, 0.4mL, 0.3mL, 0.2mL, 0.1mL of chloroplatinic acid solutions were added to the four above-mentioned solutions, stirred for 10 minutes, and then transferred to a 20mL polytetrafluoroethylene reactor. React at 160°C for 5h. The precipitate was washed 3 to 5 times with ethanol and stored in ethanol.

Embodiment 2

[0027] Pre-prepared Pd seed solution stored in ethanol with a concentration of about 649.1mg / L, ultrasonicated for 30-60 minutes to make it evenly dispersed, then took 0.5mL of Pd seed solution to remove the solvent by centrifugation, and dried to avoid the influence of dispersant ethanol reaction.

[0028] Next, N,N-dimethylacetamide was added to the four above-mentioned seeds, and stirred ultrasonically for 10 minutes to fully disperse them evenly.

[0029] Next, 0.4mL, 0.3mL, 0.2mL, and 0.1mL of chloroplatinic acid solutions were added to the four above-mentioned solutions, stirred for 10 minutes, and then transferred to a 20mL polytetrafluoroethylene reactor. React at 140°C for 5h. The precipitate was washed 3 to 5 times with ethanol and stored in ethanol.

Embodiment 3

[0031] Pre-prepared Pd seed solution stored in ethanol with a concentration of about 641.9mg / L, ultrasonicated for 30-60 minutes to make it evenly dispersed, then took 0.5mL of Pd seed solution to remove the solvent by centrifugation, and dried to avoid the influence of dispersant ethanol reaction.

[0032] Next, N,N-dimethylformamide was added to the four above-mentioned seeds, and stirred ultrasonically for 10 minutes to fully disperse them evenly.

[0033] Immediately after, 0.4mL, 0.3mL, 0.2mL, 0.1mL of chloroplatinic acid solutions were added to the four above-mentioned solutions, stirred for 10 minutes, and then transferred to a 20mL polytetrafluoroethylene reactor. React at 140°C for 5h. The precipitate was washed 3 to 5 times with ethanol and stored in ethanol.

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Abstract

The invention discloses a method for preparing Pd-Pt heterostructure nanocrystals. The method adopts a seed growth method on a five-twinned Pd nanowire, utilizes different reducing solvents and regulates the reaction temperature and time to make Pt 4+ reduced to Pt atoms and grown on five-twinned Pd nanowires, resulting in Pd‑Pt heterostructure nanocrystals. The present invention synthesizes Pd-Pt heterostructure nanocrystals with specific morphology by using different reductive solvents and regulating different temperatures and times.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer materials, in particular relates to a method for preparing Pd-Pt heterostructure nanocrystals, in particular to a method for synthesizing Pd-Pt nanocrystals by using different reducing solvents. Background technique [0002] The noble metal platinum is an important catalytic material, which is widely used in organic synthesis, automobile exhaust, petroleum refining and direct fuel cells. [0003] Pt metal catalysts are indispensable catalysts for many chemical reactions due to their superior catalytic activity and catalytic selectivity compared with ordinary materials. However, the high price of Pt, small reserves, and various problems in the actual catalytic process severely limit its universal application. [0004] Introducing another one or two metals to form an alloy or heterostructure with Pt is an important way to improve the catalytic activity of the catalyst and reduce the cost of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00B01J23/44
CPCB01J23/44B22F9/24B22F1/054
Inventor 陈伟贺彩虹陈艳鲁少杰唐文静钱嘉静杨云黄少铭
Owner WENZHOU UNIV