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Preparation method of PtRu/C binary alloy nano catalyst

A nano-catalyst and binary alloy technology, applied in the field of materials, can solve the problems of wide particle size range of catalyst metals, and achieve the effects of narrow particle size range, improved CO poisoning ability, and inhibition of agglomeration

Active Publication Date: 2012-07-25
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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Problems solved by technology

[0007] The present invention utilizes the impregnation method and uses trisodium citrate as a protective agent to prepare PtRu / C binary alloy nanoparticles with good dispersion properties, which better solves the shortcoming of the traditional impregnation method for preparing catalyst metals with a wide range of particle diameters, and is also certain. To a certain extent, the aggregation of PtRu / C binary alloy nanoparticles is inhibited, thereby improving the catalytic activity for methanol

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  • Preparation method of PtRu/C binary alloy nano catalyst
  • Preparation method of PtRu/C binary alloy nano catalyst
  • Preparation method of PtRu/C binary alloy nano catalyst

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Embodiment 1

[0025] Dissolve 30.0mg of activated carbon in 30ml of aqueous solution, raise the temperature to 40°C, stir magnetically (stirring rate 500r / min), and form a carbon slurry after 30min, slowly and sequentially add 5mL of 0.5mM H 2 PtCl 6 , 5mL 0.5mM RuCl 3 , (metal molar ratio Pt:Ru=1:1), add 14.7mg trisodium citrate as metal protective agent (trisodium citrate molarity: total metal molarity=1:1), ultrasonically stir for 30min, use 0.1 M NaOH to adjust the pH of the solution to 8, at 40°C, slowly add 10mL 0.1M NaBH 4 As a reducing agent, react for 3 hours, vacuum filter, wash with water until there is no chloride ion in the solution, and vacuum dry at 70°C for 12 hours.

[0026] To the PtRu alloy nanometer catalyst of the present invention's gained, measure the PtRu alloy nano particle diameter by transmission electron microscope, as figure 1 shown.

[0027] From figure 1 It can be seen that the PtRu alloy nanoparticles are quite small, with a particle size of about 4 nm, ...

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Abstract

The invention discloses a preparation method of a PtRu / C binary alloy nano catalyst. The preparation method comprises the following steps of: dissolving active carbon in water and then heating up and stirring to obtain carbon paste; sequentially dropping H2PtCl6, RuCl3 and a metal protector into the carbon paste, then stirring by using ultrasound and regulating the pH value to 8; slowly dropping a reducing agent; and carrying out vacuum filtration, washing and vacuum drying after reacting to finally obtain the PtRu / C binary alloy nano catalyst. The obtained PtRu / C binary alloy nano catalyst has good dispersity and strong capacity of resisting CO poisoning, and meanwhile, because the particle size range of the obtained PtRu / C binary alloy nano catalyst is 3-5 nm, the PtRu / C binary alloy nano catalyst has the characteristic of narrow particle size range; the agglomeration of PtRu / C binary alloy particles is slowed down, and the stability of the alloy is increased; meanwhile, the catalytic activity of the PtRu / C binary alloy nano catalyst to methanol is also improved to certain degree. The preparation method has the advantages of simple and convenient operation, less time consumption, and the like.

Description

technical field [0001] The invention relates to a preparation method of a PtRu / C binary alloy nano catalyst, which belongs to the field of materials. Background technique [0002] Because of its high energy conversion efficiency and low pollution, it is beneficial to reduce the excessive use of fossil fuels and protect the earth's environment. Fuel cells have now attracted widespread attention from researchers from all over the world. Direct methanol fuel cell is a variant of hydrogen proton exchange membrane fuel cell. Methanol is equivalent to a hydrogen storage carrier. Methanol is a liquid organic compound with the simplest structure at normal temperature and pressure. It is easy to store, easy to source, and cheap. An ideal renewable fuel, and there is no C-C bond in the methanol molecule, high electrochemical activity, and can maintain a high energy conversion efficiency. [0003] Pt has high catalytic activity for methanol oxidation, but the intermediate product of m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/46
Inventor 徐群杰周小金李金光李巧霞
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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