Preparation method of precious metal alloy/carbon material supported catalyst

A supported catalyst and carbon material technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Large size, slow drying speed and other problems, to achieve the effect of small size, high production efficiency and uniform composition

Inactive Publication Date: 2018-11-06
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size and consistency of the noble metal alloy catalyst prepared by the high temperature reduction method, the controllability of the crystal structure and other aspects are still relatively prominent, which greatly affects the catalytic performance of the noble metal alloy catalyst.
[0004] In addition, the usual spray drying is to atomize the solution and heat it in hot gas to achieve drying. Due to the slow drying speed, the dry powder particles are relatively large

Method used

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  • Preparation method of precious metal alloy/carbon material supported catalyst
  • Preparation method of precious metal alloy/carbon material supported catalyst
  • Preparation method of precious metal alloy/carbon material supported catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Pt 3 Preparation of Co / Conductive Carbon Black Supported Catalyst

[0028] Step 1, get 1 gram of chloroplatinic acid hexahydrate [H 2 PtCl 6 ·6H 2 O], 0.187 grams of cobalt nitrate hexahydrate [Co(NO 3 ) 2 ·6H 2 O] Dissolve in 150mL deionized water by ultrasonication for 10min, then add 1.66g of Vulcan XC-72R carbon black and 1.66g of PVP (average molecular weight 8000) and mix well by ultrasonication for 20 minutes. The molar ratio of platinum to cobalt atoms is 3:1, and the weight ratio of platinum plus cobalt to conductive carbon black is 1:4.

[0029] Step 2, the mixed mixed solution is sprayed and quickly dried to obtain a dry mixed powder: the fine mist is sprayed onto a quartz plate with a temperature of 270 ° C, and the aqueous solution is quickly evaporated to obtain a dry mixed powder, and the spray speed is 20 ml solution / min.

[0030] Step 3, remove the dry mixed powder obtained in step 2 from the quartz plate, and anneal in hydrogen for 60 minutes a...

Embodiment 2

[0033] Pt 3 Preparation of Co / Conductive Carbon Black Supported Catalyst

[0034] This example is a modification example of Example 1. Other implementation conditions are the same as in Example 1, except that the annealing temperature in hydrogen in step 3 is 700°C.

[0035] Effect: Pt prepared in Example 2 3 TEM photo of Co / conductor carbon black as figure 1 Shown, Pt 3 The average size of Co alloy nanoparticles is about 5.1 nm. The XRD results after hydrogen reduction at 700°C are as follows figure 2 Shown, Pt 3 The crystal structure of Co nanoparticles is L 10 Quartet orderly structure. To test Pt 3 Oxygen reduction catalytic activity of Co / conductive carbon black, which will be prepared to obtain Pt 3 Co / conductive carbon black, test oxygen reduction performance in 0.1M perchloric acid, the results are as follows image 3Shown, Pt 3 The oxygen reduction catalytic activity of Co / conductive carbon black is higher than that of commercial Pt / conductive carbon blac...

Embodiment 3

[0037] Preparation of PtFeCoNi / Conductive Carbon Ink Supported Catalyst

[0038] Step 1, get 1 gram of chloroplatinic acid hexahydrate [H 2 PtCl 6 ·6H 2 O], 0.780 grams of ferric nitrate nonahydrate [Fe(NO 3 ) 3 9H 2 O], 0.562 grams of cobalt nitrate hexahydrate [Co(NO 3 ) 2 ·6H 2 O], 0.561 grams of nickel nitrate hexahydrate [Ni(NO 3 ) 2 ·6H 2 O], dissolved in 150mL deionized water, ultrasonically dissolved for 10min, then added 2.846g of Vulcan XC-72R carbon black and 2.846g of PVP (average molecular weight 8000) and ultrasonically mixed for 20 minutes. The atomic molar ratio of platinum to iron, cobalt and nickel is 1:1:1:1, and the weight ratio of the sum of the weights of platinum, iron, cobalt and nickel to the conductive carbon black is 1:4.

[0039] Step 2, the mixed solution is sprayed and quickly dried to obtain a dry mixed powder: the fine mist is sprayed onto a quartz plate with a temperature of 250 ° C, and the aqueous solution is quickly evaporated to ...

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Abstract

A preparation method of a precious metal alloy / carbon material supported catalyst comprises the steps that 1, a mixed solution of at least one precious metal salt or acid, at least one transition metal salt or acid, a carbon material and a dispersing agent is prepared; 2, the obtained mixed solution is prepared into compound powder by a method of spraying the solution to the surface of a high-temperature solid and performing quick drying; 3, the compound powder obtained in the step 2 is annealed in the reducing atmosphere, and metal alloying is performed to obtain the precious metal alloy / carbon material supported catalyst. The mixed solution of the precious metal salt or acid, the transition metal salt or acid, the carbon material and the dispersing agent contains the precious metal saltor acid, the transition metal salt or acid, the carbon material, the dispersing agent and a solvent. By utilizing rapid evaporation of water when the solution is sprayed to the surface of the high-temperature solid and is rapidly dried and separation of the precious metal alloy by carbon material powder, alloy particles do not grow in the annealing process, and small-sized precious metal alloy nano-particles are uniformly supported on the surface of a carbon material.

Description

technical field [0001] The invention relates to a preparation method of a noble metal alloy / carbon material supported catalyst, belonging to the fields of nanometer material synthesis and electrochemical catalysis. Background technique [0002] Noble metal alloy nanocatalysts have suitable adsorption / desorption capabilities for reactants and products, and play an extremely important role in heterogeneous catalytic reactions such as environmental catalysis, fuel cells, and fine chemicals. For example, the active components of the three-way catalyst for purifying automobile exhaust gas are platinum group elements, and platinum-based nanostructured electrodes show excellent performance in the electrocatalytic reaction of fuel cells. Due to the scarcity and high price of precious metals, reducing their usage while maintaining or even improving their catalytic performance and recycling efficiency has become the focus of research. The preparation of nano-catalysts with smaller pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89
CPCB01J23/8913B01J23/892
Inventor 唐少龙程振之王思皓罗晴雨都有为
Owner NANJING UNIV
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