A kind of preparation method of highly dispersed carbon-supported pt-ni catalyst

A high-dispersion, catalyst technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Energy saving, harsh reaction conditions and other issues, to achieve the effect of small particle size, low production cost, and improved agglomeration

Active Publication Date: 2021-12-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Pt source and the Ni source are respectively made into solutions with secondary water and mixed, and the carbon source is added to the mixed solution, and the mixed solution is ultrasonically dispersed; the mixed solution is transferred to an autoclave, and heated at a constant temperature; , dry naturally at room temperature to obtain a Pt-Ni nanocatalyst material with a carbon source as a carrier, but this method uses common ultrasonic vibration to disperse the carbon carrier, and this method cannot make the carbon particles uniform and fine enough
Moreover, the reaction conditions of this method are more severe, and need to be carried out for a long time under the condition of high temperature and high pressure, which does not meet the requirements of green energy saving
Simultaneously, the feed molar ratio Pt:Ni=1:1 in its embodiment 1, but as can be seen from the corresponding XRD figure provided, the actual alloy ratio and feed ratio are far apart, can't well control catalyst composition

Method used

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  • A kind of preparation method of highly dispersed carbon-supported pt-ni catalyst
  • A kind of preparation method of highly dispersed carbon-supported pt-ni catalyst
  • A kind of preparation method of highly dispersed carbon-supported pt-ni catalyst

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Embodiment 1

[0031] Pt 2 Ni / C catalyst (Pt:Ni molar ratio 2:1, mass accounts for 30% of catalyst total mass), takes by weighing the carbon powder slurry that is equivalent to 0.4gvulcan XC-72 carbon powder after ultrasonic and stress shear treatment, according to The above steps are followed by adding 0.7gNaCO 3 Adjust the pH to 8, and under magnetic stirring, mix 6.6 ml of 0.1158 mol / L chloroplatinic acid solution, 3.3 ml of nickel nitrate solution of the same concentration, and 1.5 g of formaldehyde solution (preparation method: add 14 ml of each 1 ml of formaldehyde solution to Diluted with deionized water) slowly drop into the slurry one by one, and stir evenly, control the reaction temperature to react at 75°C. After filtering and cleaning, at 550°C, a mixed gas of hydrogen and nitrogen (H 2 :N 2 =1:4) heat treatment for 5h to get 30%Pt 2 Ni / C catalyst. The catalyst was tested by TEM ( figure 1 ) and electrochemical characterization (Table 1), figure 1 It can be seen that the c...

Embodiment 2

[0033] Change the Pt and Ni mol ratio among the embodiment 1, prepare PtNi / C catalyst (Pt:Ni mol ratio 1:1, quality accounts for 30% of catalyst total mass), take by weighing the equivalent through stress shearing of 0.35g Ketjen black carbon powder After cutting and crushing the carbon powder slurry, add 0.7g NaHCO successively according to the above steps 3 Adjust the pH to 8, and under magnetic stirring, mix 5.8267ml of 0.1158mol / L chloroplatinic acid solution, 5.8267ml of the same concentration of nickel nitrate solution, and 1.5g of formaldehyde solution (preparation method: add 14ml of each 1ml of formaldehyde solution to Diluted with deionized water) slowly drop into the slurry one by one, and stir evenly, control the reaction temperature to react at 80°C. After filtering and cleaning, at 500°C, a mixed gas of hydrogen and nitrogen (H 2 :N 2 =1:19) was heat-treated for 5 hours to obtain a 30% PtNi / C catalyst. The catalyst was tested by TEM ( figure 2 ) and electroc...

Embodiment 3

[0035] Change Pt and Ni mol ratio among the embodiment 1, prepare Pt 3 Ni / C catalyst (Pt:Ni molar ratio 3:1, the mass accounts for 30% of the total mass of the catalyst), weigh the carbon powder slurry equivalent to 0.4g carbon powder after ultrasonic and stress shearing treatment, follow the above steps Add 0.8g NaHCO 3 Adjust the pH to 8.5, slowly drop 6.8944ml of 0.1158mol / L chloroplatinic acid solution, 2.2522ml of the same concentration of nickel nitrate solution and the prepared 1.5g of ethylene glycol solution into the slurry successively under magnetic stirring, and mix evenly Stir and control the reaction temperature to react at 85°C. After filtering and cleaning, at 600°C, a mixed gas of hydrogen and argon (H 2 :Ar=1:4) heat treatment for 2h to get 30%Pt 3 Ni / C catalyst. Get catalyst and carry out XRD test ( image 3 ) and electrochemical characterization (Table 1), image 3 It can be seen that the crystallization degree of the catalyst Pt particles is good, an...

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Abstract

The invention relates to a preparation method of a highly dispersible carbon-supported Pt-Ni catalyst, comprising the following steps: carrying out a special dispersion treatment on a carrier carbon black material in deionized water; adding a soluble Pt precursor and a soluble Ni precursor to the carrier slurry After the reaction is complete, the product is filtered, washed, precipitated, dried, and ground to obtain an intermediate product; the intermediate product is heat-treated with a reducing gas at high temperature to obtain a Pt-Ni / C catalyst. The method of the invention is simple to operate, and the preparation conditions are green, energy-saving, mild and controllable, and can effectively control the composition of the synthetic catalyst. The results show that the prepared catalyst particles are uniformly distributed, moderate in size, and have high catalytic activity for oxygen reduction. The addition of Ni improves the catalytic performance while reducing the cost of the catalyst, and can be effectively applied to industrial production.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a preparation method of a highly dispersed carbon-supported Pt-Ni catalyst. Background technique [0002] With the progress of the times and the development of the economy, human beings' demand for energy is increasing day by day, and at the same time, higher requirements are put forward for sustainable construction ideas. Traditional fossil fuels have caused serious pollution and damage to the ecological environment due to their non-renewability and the release of a large amount of carbon oxides, nitrogen oxides, sulfur oxides and other waste gases and toxic gases during their combustion process. One of the important reasons for the formation of weather. Proton exchange membrane fuel cell (PEMFC), as an environmentally friendly energy source, has attracted the attention of academic and industrial circles all over the world under the situation of increasingly deplet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89
CPCB01J23/892
Inventor 林瑞蔡鑫沈丹丹朱玉
Owner TONGJI UNIV
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