A kind of synthetic method of small particle size platinum-rhodium nanocrystal

A technology of nanocrystals and synthesis methods, which is applied in the field of synthesis of small-diameter platinum-rhodium nanocrystals, can solve problems such as low C-C bond cracking ability, limit the application of Pt nanocrystals, poisoning, etc., and achieve enhanced C-C bond breaking. Anti-poison ability and effect of reducing waste

Active Publication Date: 2022-03-04
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Platinum (Pt) is considered to be an efficient material for EOR performance, but the application of Pt ...

Method used

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  • A kind of synthetic method of small particle size platinum-rhodium nanocrystal
  • A kind of synthetic method of small particle size platinum-rhodium nanocrystal
  • A kind of synthetic method of small particle size platinum-rhodium nanocrystal

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Effect test

Embodiment 1

[0030] A kind of platinum-rhodium nanocrystal with small particle size, the particle size is 2-5 nanometers, and the synthesis steps are as follows:

[0031] (1) First, weigh 21 mg of potassium chloroplatinate, 25 mg of sodium hexachlororhodium (III) dodecahydrate, and 40 mg of polyvinylpyrrolidone (K30), then weigh 15 mg of tungsten hexacarbonyl, and then add them one by one to 7 ml of dimethyl Mix in the base formamide solution, and then sonicate for 20mins to obtain a mixed solution.

[0032] (2) Heat the mixed solution to 150°C at 6.5°C / min for 20mins, keep the temperature constant, and react for 8h to obtain a black solution. After the whole system is cooled, the product is centrifuged at 11000r / min for 20mins and washed repeatedly with 8ml of ethanol 3 times, and finally dispersed in 1ml ethanol for later use.

Embodiment 2

[0034] A kind of platinum-rhodium nanocrystal with small particle size, the particle size is 2-5 nanometers, and the synthesis steps are as follows:

[0035] (1) First weigh 21 mg of potassium chloroplatinate, 25 mg of sodium hexachlororhodium (III) dodecahydrate, and 160 mg of polyvinylpyrrolidone (K30), then weigh 15 mg of tungsten hexacarbonyl, and then add them one by one to 7 ml of dimethyl Mix in the base formamide solution, and then sonicate for 20mins to obtain a mixed solution.

[0036] (2) Heat the mixed solution to 150°C at 6.5°C / min for 20mins, keep the temperature constant, and react for 8h to obtain a black solution. After the whole system is cooled, the product is centrifuged at 11000r / min for 20mins and washed repeatedly with 8ml of ethanol 3 times, and finally dispersed in 1ml ethanol for later use.

Embodiment 3

[0038] A kind of platinum-rhodium nanocrystal with small particle size, the particle size is 2-5 nanometers, and the synthesis steps are as follows:

[0039] (1) First weigh 21 mg of potassium chloroplatinate, 25 mg of sodium hexachlororhodium (III) dodecahydrate, and 320 mg of polyvinylpyrrolidone (K30), then weigh 15 mg of tungsten hexacarbonyl, and then add them one by one to 7 ml of dimethyl Mix in the base formamide solution, and then sonicate for 20mins to obtain a mixed solution.

[0040] (2) Warm up the mixed solution to 150°C at 6.5°C / min for 20mins, keep the temperature constant, and the reaction time is 8h to obtain a black solution. Repeated washing 3 times, and finally dispersed in 1ml ethanol for later use.

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Abstract

The invention discloses a method for synthesizing platinum-rhodium nanocrystals with small particle diameters. As the reaction raw materials, the above-mentioned reaction raw materials are added to the dimethylformamide solution one by one, and ultrasonically mixed to obtain a mixed solution; (2) The mixed solution is heated to 150-160 ° C at a heating rate of 5-10 degrees/min Keeping the temperature constant, reacting for 5-10 hours to obtain a black solution, then cooling, centrifuging and washing the product to obtain a platinum-rhodium nanocrystal product with a particle size of 2-5nm. The present invention is the first to prepare platinum-rhodium nanocrystal material. Due to the introduction of rhodium, the material enhances the ability to break the C-C bond, and strengthens the anti-poisoning ability to CO. The catalytic performance and stability of the material far exceed that of commercial platinum. / carbon, the potential practical value of the material is high.

Description

technical field [0001] The invention relates to a method for synthesizing small-diameter platinum-rhodium nanocrystals, belonging to the field of nanomaterial synthesis. Background technique [0002] Ethanol, a renewable energy source for direct ethanol fuel cells (DEFCs), has many advantages such as low emissions, abundant sources, and storage safety. Due to the increasing environmental pollution and fossil fuel consumption, efforts have been devoted to the development of highly efficient catalysts for the ethanol oxidation reaction (EOR) in the past decades. However, unresolved issues such as slow reaction kinetics and intermediate poisons greatly hinder the practical application of EOR. [0003] It is widely accepted that EOR follows a dual pathway response mechanism. In most cases, incomplete oxidation of the C2 pathway prevails, producing acetic acid and acetaldehyde. Whereas the 12-electron C1 pathway via C–C bond cleavage was largely inhibited. Therefore, promotin...

Claims

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Application Information

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IPC IPC(8): C22C5/04C30B29/52C30B28/04C30B7/14B01J35/00B01J23/46B82Y30/00B82Y40/00H01M4/92
CPCC22C5/04C30B29/52C30B7/14C30B28/04H01M4/921B01J23/464B01J35/0033B82Y30/00B82Y40/00Y02E60/50
Inventor 邓宇甲周路明王宽宽濮厚康张特董开宇代会珍董婧涵
Owner QINGDAO UNIV
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